JPH118560A - Transmission output control circuit and transmission output control method - Google Patents

Abstract

(57) [Problem] To improve the power efficiency of a transmission output control circuit that is required to perform output control over a wide dynamic range. A transmission output control means for generating a control signal for controlling a transmission output based on information detected from a received signal.
19, a gain control amplifier 9 that controls the gain of the transmission signal based on the control signal, and amplifiers 5 and 7 that amplify the transmission signal with the controlled gain at a constant amplification factor. Switching means 6 and 8 for selecting a path for transmitting a signal to the amplifier or a path for passing the amplifier; and selecting a path for passing the amplifier by controlling the selection of the switching means based on a control signal of the transmission output control means. Switching control means for turning off the power to the amplifier
15 is provided. If you don't need an amplifier,
By turning off the power, unnecessary idle current is reduced, and the transmission circuit is made more efficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission output control circuit and a transmission output control method for use in mobile communication equipment and the like.
Also, the present invention relates to a mobile terminal and a mobile communication system using the same, and in particular, to reduce power consumption and improve power efficiency in a transmission circuit.

[0002]

2. Description of the Related Art In a mobile station for mobile communication, it is necessary to adjust the transmission output so that the reception level at the base station is constant even if the distance from the base station is various. Therefore, the mobile station controls the transmission output level based on the reception level of the signal received from the base station and information from the base station that has received the transmission signal of the mobile station.

As shown in FIG. 11, a conventional transmission output control circuit for performing such control includes an antenna 102 shared for transmission and reception, an antenna duplexer 103 for distributing a transmission signal and a reception signal, and a transmission level adjusted. A transmission circuit 101 that outputs a received transmission signal, a reception circuit 120 that converts a reception signal into a baseband signal, a level detection unit 123 that detects a reception level, and a demodulation unit that extracts transmission output control information included in reception data. 124, and transmission output control means 119 for generating a control signal for transmission output level control based on the detected reception level and transmission output control information.

The transmitting circuit 101 has input terminals 113 and 114
, Orthogonal modulation means 112 for orthogonally modulating the I- and Q-channel baseband signals input from each of the above, local oscillation means 111 for oscillating a local signal, and increasing the frequency by multiplying the orthogonally-modulated signal by the local signal. It includes an up-converter 110, a gain control amplifier 109 for adjusting the gain of an input signal based on a control signal output from the transmission output control means 119, and an amplifier 105 for amplifying the input signal with a constant gain. .

The operation of the conventional transmission power control circuit configured as described above will be described.

First, a baseband signal input terminal (Ic
h) The baseband signal input from 113 and the baseband signal input terminal (Qch) 114 is quadrature-modulated by the quadrature modulator 112 and then input to the up-converter 110.

The up-converter 110 converts this signal into
By multiplying the local signal oscillated by the local oscillation means 111,
After frequency conversion to RF band, gain control amplifier
Output to 109.

The gain control amplifier 109 controls the output level of the input signal based on the control signal output from the transmission output control means 119 and input via the control terminal 118. The transmission signal whose output level is controlled is sent to the amplifier 10
5 is amplified to a required level, and output from the antenna 102 through the antenna duplexer 103.

On the other hand, the RF signal received by the antenna 102 is input to the receiving circuit 120 via the antenna duplexer 103.

The receiving circuit 120 outputs a baseband signal from a baseband signal output terminal (Ich) 121 and a baseband signal output terminal (Qch) 122 after frequency conversion and quadrature demodulation.

The respective baseband signals are input to a level detecting means 123 and a demodulating means 124,
In 3, the reception level is detected, and the detection result is output to the transmission output control means 119, and the demodulation means 124 extracts the transmission output control information included in the reception data and outputs it to the transmission output control means 119. I do.

The transmission output control means 119 determines the transmission output level based on the reception level information and the transmission output control information, generates a control signal, and outputs the control signal to the transmission circuit 101.

The output control signal is input to a gain control amplifier 109 via a control terminal 118, and the gain control amplifier 109 controls the transmission output level by varying the gain based on the control signal. You.

[0014]

However, in the conventional transmission output control circuit, when wide dynamic output control is performed,
Even if there is no amplifier 105 having a constant gain, for example, only the output of the gain control amplifier 109 at the preceding stage may cause a state where the transmission output level is sufficient.

At this time, power is consumed only for the idle current of the amplifier 105, although the level is not necessary. For this reason, the power efficiency when the transmission output is controlled to be low is significantly reduced (see FIG. 12).

The present invention solves such a conventional problem, and provides a transmission output control circuit having high power efficiency at low output when performing wide dynamic transmission output control. An object of the present invention is to provide an output control method, a mobile terminal and a mobile communication system using the same.

[0017]

For this purpose, the transmission output control circuit of the present invention is provided with means for passing the amplifier when the transmission output is reduced to an unnecessary level by the amplifier,
Turn off the power of this amplifier to reduce unnecessary current consumption,
The power efficiency of the transmission circuit is improved.

Further, according to the transmission output control method of the present invention,
Alternatively, when controlling the transmission output of a transmission signal amplified by a plurality of amplifiers based on information detected from a reception signal, select an amplifier for obtaining a required transmission output, and supply power to the unselected amplifier. To reduce unnecessary idle current to the amplifier and improve power efficiency.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a transmission output control means for generating a control signal for controlling a transmission output based on information detected from a received signal;
A path for sending a transmission signal to an amplifier in a transmission output control circuit including a gain control amplifier that controls the gain of the transmission signal based on the control signal and an amplifier that amplifies the transmission signal with the controlled gain at a constant amplification factor Or switching means for selecting one of the paths for transmitting the transmission signal through the amplifier, and controlling the selection of the switching means based on the control signal sent from the transmission output control means, and setting a path for passing the amplifier. Switching control means for controlling so as to cut off the power supply to the amplifier when selected, and when the transmission output level at which the amplifier is not necessary is passed, the power supply to the amplifier is passed. Unnecessary idle current can be reduced by cutting the supply.

According to a second aspect of the present invention, one or a plurality of amplifiers are provided, and a switching means is provided in front of the amplifier, and only an amplifier necessary for obtaining a predetermined transmission output level is selected. By cutting off the power supply through other amplifiers, the power efficiency of the transmission circuit is improved.

According to a third aspect of the present invention, the transmission output control means generates a control signal for controlling the gate bias of the amplifier. By controlling the gate bias, the transmission distortion characteristic is allowed. As far as possible, the current consumption of the amplifier can be suppressed, and the power efficiency of the transmission circuit can be further improved.

According to a fourth aspect of the present invention, there is provided an amplifier arranged in parallel with the amplifier, and the switching means switches a path for transmitting a transmission signal to one of the amplifiers arranged in parallel or a path of the amplifier. It selects one of the paths for transmitting the transmission signal by passing it all over, and by selecting an amplifier that can always be used in a highly efficient state according to the transmission output level, the transmission circuit of the transmission circuit can be extended over a wide range. High efficiency can be achieved.

According to a fifth aspect of the present invention, the gain control amplifier controls a gain of a transmission signal before being converted into a radio frequency, and uses a gain control amplifier for performing wide dynamic output control. Since the frequency band is reduced, the design of the gain control amplifier itself and the pattern design around the gain control amplifier become easy.

According to a sixth aspect of the present invention, there is provided a position information judging means for identifying position information in a serving cell based on information from a base station. In consideration of the identified position information, the switching control of the amplifier is performed, and when the transmission power is temporarily reduced, for example, by not performing the complicated switching of the amplifier, Transmission output control can be stabilized.

[0025] The invention according to claim 7 is the invention according to claims 1 to 6.
The transmission output control circuit according to any one of the above is provided in the mobile communication terminal, and the power efficiency of the mobile communication terminal can be improved.

According to a eighth aspect of the present invention, there is provided a transmission output control method for controlling a transmission output of a transmission signal amplified by one or a plurality of amplifiers based on information detected from a reception signal. Choose the amplifier to get,
The power supply to the unselected amplifier is cut off, and unnecessary idle current to the amplifier can be reduced to improve power efficiency.

According to the ninth aspect of the present invention, the gate bias of the selected amplifier is controlled, and the current consumption of the activated amplifier can be suppressed.

According to a tenth aspect of the present invention, an amplifier for obtaining a required transmission output is selected from amplifiers arranged in parallel, and has a high power efficiency over a wide dynamic range. Efficiency can be realized.

According to an eleventh aspect of the present invention, the switching of the selection of the amplifier is performed in consideration of the positional information in the serving cell detected from the received signal, and the transmission power is temporarily reduced. By preventing the complicated switching of the amplifier when the power becomes low, the transmission output control can be stabilized.

[0030] According to a twelfth aspect of the present invention, the mobile communication base station performs transmission by inserting location information of a locating mobile station within a cell, and the mobile station transmits the mobile station according to the eleventh aspect. This is a mobile communication system that implements the output control method, and it is possible to improve the stability of the mobile communication system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) As shown in FIG. 1, a transmission output control circuit according to a first embodiment includes an antenna 2 used for transmission and reception, and an antenna duplexer for distributing a transmission signal and a reception signal. 3, a transmission circuit 1 for outputting a transmission signal whose transmission level is adjusted, a reception circuit 20 for converting a reception signal into a baseband signal, a level detection means 23 for detecting the reception level, and a transmission output included in the reception data. It includes demodulation means 24 for extracting control information, and transmission output control means 19 for generating a control signal for transmission output level control based on the detected reception level and transmission output control information.

The transmitting circuit 1 includes an orthogonal modulating means 12 for orthogonally modulating the I- and Q-channel baseband signals input from the input terminals 13 and 14, a local oscillating means 11 for oscillating a local signal, An upconverter 10 for increasing the frequency by multiplying the quadrature-modulated signal by a local signal, and a gain of the input signal based on a control signal output from the transmission output control means 19 and input via the third control terminal 18. A gain control amplifier 9 for adjustment, a third switching means 8 for switching a port (h or j) to be connected according to a transmission output level, and a second amplifier for amplifying a signal input from the port h with a constant amplification factor. 7, second switching means 6 for switching the port (d or e) to be connected according to the transmission output level, and amplifying the signal input from port d at a constant amplification factor A first amplifier 5 that, port a
The first switching means 4 for switching the port (b or c) to be connected to the first control terminal 16 and the control signal output from the transmission output control means 19 and input via the first control terminal 16 and the second control terminal 17 A switching control signal for the first switching means 4, the second switching means 6, and the third switching means 8,
And the power supply Vdd of the first amplifier 5 and the second amplifier 7
1, a switching control means 15 for outputting a control signal for turning on / off Vdd2.

The operation of the transmission output control circuit will be described.

The baseband signals input from the baseband signal input terminal (Ich) 13 and the baseband signal input terminal (Qch) 14 are quadrature-modulated by the quadrature modulation means 12 and then input to the up-converter 10.

In the up-converter 10, this signal is multiplied by a local signal oscillated by the local oscillation means 11 to obtain an RF signal.
After the frequency conversion into the band, the signal is output to the gain control amplifier 9.

The gain control amplifier 9 controls the output level of the input signal based on the control signal output from the transmission output control means 19 and input via the third control terminal 18. The transmission signal whose output level is controlled is input to the third switching means 8.

The third switching means 8 selects a port to be connected according to a control signal from the switching control means 15. When the third switching means 8 selects the port h, the signal output from the port h is input to the second amplifier 7, amplified at a constant amplification factor, and output to the port f.

When the second amplifier 7 is not used, the third switching means 8 selects the port i according to the control signal from the switching control means 15. The port i is a route that passes through the second amplifier 7 and is directly connected to the port g. At this time, the power supply Vdd2 of the second amplifier 7 is cut off by the control signal from the switching control means 15.

The second switching means 6 includes switching control means.
The port to be connected is selected by the control signal from 15.
When the second switching means 6 selects the port d, the signal output from the port d is input to the first amplifier 5,
The signal is amplified at a constant amplification rate and output to port b.

When the first amplifier 5 is not used, the second switching means 6 selects the port e according to the control signal from the switching control means 15. The port e is a route that passes through the first amplifier 5 and is directly connected to the port c. At this time, the power supply Vdd1 of the first amplifier 5 is cut off by the control signal from the switching control means 15.

The first switching means 4 selects port b or port c according to the control signal from the switching control means 15, and outputs a transmission signal to port a. The transmission signal output from the port a is output from the antenna 2 after unnecessary waves are suppressed by the antenna duplexer 3.

On the other hand, in the received RF signal received by the antenna 2, unnecessary waves are suppressed by the antenna duplexer 3, and the reception circuit
Enter 20.

After frequency conversion and quadrature demodulation, the receiving circuit 20 outputs a baseband signal from a baseband signal output terminal (Ich) 21 and a baseband signal output terminal (Qch) 22.

Each of the baseband signals is input to a level detecting means 23 and a demodulating means 24. The level detecting means 23 detects a reception level, outputs the information to a transmission output control means 19, and outputs a demodulated signal. The means 24 extracts the transmission output control information included in the reception data, and
Output to

The transmission output control means 19 determines a transmission output level based on the reception level information and the transmission output control information, and generates and outputs a control signal.

The output control signal is supplied to the first control terminal 16.
And input to the switching control means 15 via the second control terminal 17 and to the gain control amplifier 9 via the third control terminal 18. The switching control unit 15 controls the switching of the first switching unit 4, the second switching unit 6, and the third switching unit 8 based on the control signal.
The power supplies Vdd1, Vdd of the first amplifier 5 and the second amplifier 7
On / off of dd2 is controlled. The gain control amplifier 9 changes the gain based on the control signal and controls the transmission output level.

Next, the operation of each unit according to the transmission output level will be described.

FIG. 2 shows a dynamic range of 80 dB,
FIG. 4 shows gains in sections A, B, and C of FIG. 1 and a transmission output level at an antenna end when the gains of the first and second amplifiers are each 10 dB.

Table 1 below shows the control state of the switching control means 15 with respect to the gain control amount.

[0051]

[Table 1]

Here, a case where the output power is reduced from the time of maximum output will be described. First, the gain control amount is 0d
When B (maximum output) to -10 dB, the signal path is from the gain control amplifier 9 to the port j to the port h.
To the second amplifier 7 to port f to port d to the first amplifier 5 to port b to port a.

At this time, the first and second amplifiers are both on, and the gain control amplifier 9 is attenuated continuously.

Next, the gain control amount is from -10 dB to -20 dB.
In the case of B, the signal path is the gain control amplifier 9
-Port j-port h-second amplifier 7-port f-port e-port c-port a.

That is, the power of the first amplifier 5 is turned off,
Take a path through this amplifier. Gain control amount -10d
In the case of B, the gain decrease in the section A is compensated by increasing the gain in the gain control amplifier 9 in a stepwise manner, and the continuity of the antenna output level is maintained.

After the switching, the gain control amplifier 9 is continuously attenuated as in the case of the gain control amount of 0 to -10 dB.

Further, the gain control amount is -20 dB to -80 dB.
, The signal path is from the gain control amplifier 9 to
Port j to port i to port g to port e to port c
It becomes port a.

That is, the power supplies of the first and second amplifiers 5 and 7 are both turned off, and a path for passing the amplifiers is taken.

When the gain control amount is -20 dB, the gain decrease in the section B is compensated by increasing the gain in the gain control amplifier 9 in a stepwise manner, and the continuity of the antenna output level is maintained.

After the switching, the gain control amplifier 9 is continuously attenuated as in the case of the gain control amount of 0 to -10 dB.

FIG. 3 shows how the power efficiency of the transmission circuit changes when the gain is controlled by such switching.

The efficiency is improved by turning off unnecessary amplifier power in the vicinity of the gain control amounts of -10 dB and -20 dB.

As described above, in the transmission output control circuit according to the first embodiment, when an amplifier is unnecessary according to the transmission output level, the amplifier is sequentially passed, and the power supply of the amplifier is turned off, thereby setting the unnecessary idle power. The current can be reduced, and high efficiency of the transmission circuit can be realized.

Although the case where two amplifiers are switched has been described here, the number of amplifiers may be one or three or more, and it goes without saying that the same effect can be obtained.

(Second Embodiment) In the transmission output control circuit of the second embodiment, the power efficiency of the transmission circuit is further improved by controlling the gate bias of the amplifier.

In this transmission output control circuit, the first amplifier 5 and the second amplifier 5 are transmitted from the transmission output control means 19 via the fourth control terminal 25 and the fifth control terminal 26 as shown in FIG. A control signal is sent to the amplifiers 7 to vary the gate bias of these amplifiers. Other configurations are the same as those of the first embodiment (FIG. 1).

The operation of the transmission output control circuit according to the second embodiment will be described.

The basic gain switching operation is the same as that of the first embodiment, except that only the control of the gate bias of each amplifier is added.

FIG. 5 shows how the gate bias of each amplifier changes and the gain of each amplifier, which is controlled in accordance with the transmission output level. FIG. 6 shows the transmission output level. 2 shows the power efficiency of the transmission circuit corresponding to FIG.

First, the gain control amount is 0 dB (at the time of maximum output)
-10 dB, the gate bias Vgg1 of the first amplifier 5 decreases as the transmission output level decreases.
, While allowing transmission distortion characteristics within a certain specification range, gradually reducing the current consumption in the amplifier as much as possible.

Further, the gate bias Vgg2 of the second amplifier 7 serving as the driver stage is controlled so as not to cause transmission distortion as much as possible.

Next, the gain control amount is changed from -10 dB to -20.
At the time of dB, the first amplifier 5 is turned off and the path passes, so that the second amplifier 7 is the last-stage amplifier of this transmission circuit.

When the gain control amount is from 0 dB to -10 dB,
The second amplifier 7 controls the gate bias so as not to cause transmission distortion as much as possible. However, since the second amplifier 7 is the last-stage amplifier, the gate bias Vgg2 can be reduced within the range of the specification of the transmission circuit. Become.

The gain control amount is changed from -20 dB to -80.
At the time of dB, the first and second amplifiers are both turned off, so that gate bias control is unnecessary.

As described above, in the transmission output control circuit of the second embodiment, the function of controlling the gate bias of the amplifier is provided, and the transmission distortion characteristic is allowed within a certain specification range according to the transmission output level. The gate bias is controlled so that the current consumption in the amplifier is suppressed as much as possible. Therefore, in addition to the improvement in power efficiency obtained by turning off each amplifier, this gate bias control allows
As shown by the solid line in FIG. 6, the output decrease section, that is, 0 dB
-10 dB and -10 dB to -20 dB in the section.

(Third Embodiment) In the transmission output control circuit of the third embodiment, an amplifier is provided in parallel, and an amplifier for efficiently amplifying a signal of that level is selected according to the transmission output level. By doing so, the power efficiency of the transmission circuit is further improved.

As shown in FIG. 7, this transmission output control circuit includes a third amplifier 27 in parallel with the first amplifier 5,
A fourth amplifier 28 is connected in parallel with the second amplifier 7. Although the gains of the first, second, third, and fourth amplifiers are all the same, the level of the handling power at which efficient amplification is performed in each amplifier decreases in this order.

The other structure is the same as that of the second embodiment (FIG. 4). FIG. 7 shows only the output control unit, and the other parts are the same as those in FIG.

The operation of the transmission output control circuit according to the third embodiment will be described.

The basic gain switching operation is the same as that of the second embodiment, except that the amplifier used in the sections A and B is changed according to the transmission output level.

FIG. 8 shows that the dynamic range is 80 dB, and the gains of the first, second, third, and fourth amplifiers are each 1 unit.
0 dB, and the difference between the handling power of each amplifier is 5 dB.
7 shows gains in sections A, B, and C of FIG. 7, ON / OFF states of the amplifiers, and a transmission output level at the antenna end.

Table 2 below shows the control state of the switching control means 15 with respect to the gain control amount.

[0083]

[Table 2]

Here, a case where the output power is reduced from the time of maximum output will be described. First, the gain control amount is 0d
From B (at maximum output) to -5 dB, the signal path is
Gain control amplifier 9-port j-port h-second amplifier 7-port f-port d-first amplifier 5
Port b to port a.

When the first and second amplifiers are on and the third and fourth amplifiers are off, the gain control amplifier 9 is continuously attenuated.

Next, the gain control amount is changed from -5 dB to -10 dB.
In the case of B, the signal path is the gain control amplifier 9
-Port j-port h-second amplifier 7-port f-port 1-third amplifier 27-port k-port a.

The gain control amplifier 9 is continuously attenuated when the third and second amplifiers are on and the first and fourth amplifiers are off.

Next, when the gain control amount is -10 dB to -15 d
In the case of B, the signal path is the gain control amplifier 9
-Port j-port h-second amplifier 7-port f-port e-port c-port a.

That is, the power of the first and third amplifiers is turned off, a path is taken, and the power of the fourth amplifier is also turned off.

When the gain control amount is −10 dB, the gain decrease in the section A is compensated by increasing the gain of the gain control amplifier 9 in a stepwise manner, so that the continuity of the antenna output level is maintained.

After the switching, the gain control amount is 0 to -10 dB.
As in the case of, the gain control amplifier 9 attenuates continuously.

Next, the gain control amount is -15 dB to -20 dB.
In the case of B, the signal path is the gain control amplifier 9
-Port j-port n-fourth amplifier 28-port m-port e-port c-port a.

That is, the power of the first and third amplifiers is turned off, a path is taken, and the power of the second amplifier is also turned off.

The gain control amplifier 9 attenuates continuously.

Further, the gain control amount is -20 dB to -80 dB.
, The signal path is from the gain control amplifier 9 to
Port j to port i to port g to port e to port c
It becomes port a.

That is, the power supply of all the first, second, third and fourth amplifiers is turned off and a path is taken to pass.

When the gain control amount is −20 dB, the gain decrease in the section B is compensated by increasing the gain of the gain control amplifier 9 in a stepwise manner, so that the continuity of the antenna output level is maintained.

After the switching, the gain control amplifier 9 is continuously attenuated as in the case of the gain control amount of 0 to -10 dB.

FIG. 9 shows how the power efficiency of the transmission circuit changes when the gain is controlled by such switching.

Gain control amount -5 dB, -10 dB, -15
The efficiency is improved by turning off the power supply of the unnecessary amplifier in the vicinity of dB and -20 dB.

As described above, in the transmission output control circuit of the third embodiment, although the gain does not change, amplifiers having different handling powers are connected in parallel, and the signal of that level is efficiently converted according to the transmission output level. When the amplifier is unnecessary, the amplifier is passed and the power is turned off to reduce unnecessary idle current, and the transmission circuit can be reduced over a wide dynamic range. Power efficiency can be improved.

Although the case where two amplifiers are connected in parallel has been described here, it is needless to say that three or more amplifiers may be provided, and similar effects can be obtained.

(Fourth Embodiment) In a transmission output control circuit according to a fourth embodiment, as shown in FIG. 10, a gain control amplifier 9 is provided not with an RF band but with an up-converter 10 and a quadrature modulation means 12. Connected to the IF stage.
Other configurations are the same as those of the second embodiment (FIG. 4).

In this transmission output control circuit, a gain control amplifier 9 for performing wide dynamic output control is connected to an IF
Gain control amplifier 9
Operating frequency band at Therefore, it is easy to secure the isolation of the gain control amplifier itself,
Further, since the current consumption is reduced, the design of the gain control amplifier 9 is facilitated, and at the same time, the pattern design around the gain control amplifier is facilitated.

(Fifth Embodiment) The transmission output control circuit according to the fifth embodiment is capable of avoiding frequent switching of amplifiers due to temporary fluctuation of radio wave propagation in an actual mobile communication system. it can.

As shown in FIG. 13, the transmission power control circuit includes a cell radius determining means 29 for identifying the distance to the base station based on the position information of the mobile station sent from the base station. . The identification result of the cell radius judging unit 29 is sent to the transmission output control unit 19, and the transmission output control unit 19 controls the switching of the amplifier in consideration of this information. Other configurations are the same as those of the third embodiment (FIG. 7).

The mobile station having this transmission power control circuit
It is used in a mobile communication system in which information transmitted from a base station includes position information of each mobile station located in a cell.

The transmission power control circuit of the mobile station converts the received signal into a baseband signal, and the baseband signal is input to the level detection means 23 and the demodulation means 24. The level detection means 23 detects the reception level and outputs the information to the transmission output control means 19, and the demodulation means 24 demodulates the baseband signal and then outputs the transmission output control information included in the reception data. It is extracted and output to the transmission output control means 19. Further, the cell radius determining means 29 determines the distance from the mobile station to the base station based on the position information included in the received data, and notifies the transmission output control means 19 of the determined distance.

The transmission power control means 19 determines the transmission power level based on the reception level information, the transmission power control information and the distance information to the base station, and controls the switching of the amplifiers 5, 7, 27, 28. .

The basic operation of the transmission output control means 19 is the same as that of the third embodiment, and selects an amplifier to be operated according to the determined transmission output level. The signal path is switched and unnecessary power supply of the amplifier is turned off.

However, in the third embodiment, even when the transmission output level is reduced by switching the amplifier, the distance to the base station transmitted from the cell radius determining means 29 is equal to the maximum allowable distance (the gain of the selected amplifier). (The distance between the mobile station and the base station corresponding to the transmission power level at which the transmission power level is maximized), the transmission power control means 19 reduces the transmission power level without switching the amplifier. .

In order to carry out this operation, the transmission output control means 19 controls each of the amplifiers 5 and 5 based on the transmission results so far.
The maximum allowable distance corresponding to the combination of 7, 27 and 28 is stored.

When the amplifier is switched along with the reduction of the transmission output level when the current maximum allowable distance is slightly longer than the distance to the base station, the maximum allowable distance after the amplifier switching is changed to the base station. It will be less than the distance. Therefore, if the reduction in the transmission output level is caused by a temporary change in the radio wave state, when the radio wave state returns to the original state, it is necessary to switch the amplifier again, and the switching frequency of the amplifier increases. This impairs the stability of the transmission output control.

In order to prevent such a situation from occurring, the transmission output control means 19 of this circuit provides a transmission output control means for reducing the transmission output level when the current maximum allowable distance is slightly greater than the distance to the base station. Priority is given to the stability of the amplifier, and the amplifier is not switched. Therefore, the amplifier 5,
The connection state of 7, 27, 28 is maintained as it is, and the transmission output level is adjusted by the gain control of the gain control amplifier 9 and the gate bias control of the amplifiers 5, 7.

FIG. 14 shows an example of switching of the amplifier corresponding to the transmission output level in the transmission output control circuit, and FIG. 15 shows a change in power efficiency at that time. FIG.
4 corresponds to FIG. 8 of the third embodiment, and FIG. 15 corresponds to FIG.

Here, the maximum allowable distance when the transmission signal is output with the gain control amount set to -6 dB (that is,
It is assumed that the maximum allowable distance when the amplifier 3 is selected) is slightly longer than the distance to the base station. At this time, when the gain control amount is reduced to -10 dB or less, the amplifiers 1 to 4 are not switched, and as shown in FIG.
With the amplifier 3 connected, the transmission output level is adjusted.

As can be seen by comparing FIG. 15 and FIG. 9, the power efficiency in this case achieves almost the same efficiency as the maximum output (gain control amount 0 dB) at the point of the gain control amount -6 dB. . The efficiency near the gain control amount of −10 dB when the transmission output level is reduced due to the temporary fluctuation of the radio wave state is slightly inferior to the third embodiment, but the amplifier is switched to increase the efficiency. It is more advantageous to stabilize the transmission output control without performing this.

In the mobile communication having the small zone configuration, the base station informs each mobile station located therein of the radius of the cell, and the maximum allowable distance of the selected amplifier in the mobile station is slightly smaller than the cell radius. If it does, no further switching of the amplifier may be performed.

Further, the base station transmits position information to each mobile station, and the mobile station having received the position information calculates a transmission output level corresponding to the distance to the base station. However, if the calculated value is far from the calculated value, it is regarded as a change in the transmission output level caused by a temporary change in the radio wave state, and the amplifier is not switched.
The transmission output level may be controlled. Also in this case, frequent switching of amplifiers can be avoided, and transmission output control can be stabilized.

Also, here, the case where the cell radius determining means is provided in the device of the third embodiment has been described. However, this configuration may be applied to the circuit of the first, second or fourth embodiment. It is possible.

[0121]

As is apparent from the above description, the transmission output control circuit of the present invention turns off the unnecessary amplifier power supply according to the transmission output level to reduce unnecessary idle current. Higher power efficiency in the transmission circuit can be realized.

Further, the transmission power control method of the present invention can reduce unnecessary idle current to the amplifier and improve power efficiency.

Further, the mobile communication terminal of the present invention can reduce current consumption and increase power efficiency.

Further, the mobile communication system of the present invention can improve the stability of the system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a transmission output control circuit according to a first embodiment of the present invention;

FIG. 2 is a graph showing a change in gain of each amplifying unit corresponding to a transmission output level in the transmission output control circuit according to the first embodiment;

FIG. 3 is a graph showing a change in power efficiency of the transmission circuit corresponding to a transmission output level in the transmission output control circuit according to the first embodiment;

FIG. 4 is a block diagram showing a configuration of a transmission output control circuit according to a second embodiment of the present invention;

FIG. 5 is a graph showing a change in gain of each amplifying unit corresponding to a transmission output level in the transmission output control circuit according to the second embodiment;

FIG. 6 is a graph showing a change in power efficiency of the transmission circuit corresponding to the transmission output level in the transmission output control circuit according to the second embodiment;

FIG. 7 is a block diagram showing a configuration of a transmission output control circuit according to a third embodiment of the present invention;

FIG. 8 is a graph showing a change in gain of each amplifying unit corresponding to a transmission output level in the transmission output control circuit according to the third embodiment;

FIG. 9 is a graph showing a change in power efficiency of the transmission circuit corresponding to the transmission output level in the transmission output control circuit according to the third embodiment;

FIG. 10 is a block diagram illustrating a configuration of a transmission output control circuit according to a fourth embodiment of the present invention;

FIG. 11 is a block diagram showing a configuration of a conventional transmission output control circuit;

FIG. 12 is a graph showing a change in power efficiency of a transmission circuit corresponding to a transmission output level in a conventional transmission output control circuit;

FIG. 13 is a block diagram illustrating a configuration of a transmission output control circuit according to a fifth embodiment of the present invention.

FIG. 14 is a graph showing a change in gain of each amplifying unit corresponding to a transmission output level in the transmission output control circuit according to the fifth embodiment;

FIG. 15 is a graph showing a change in power efficiency of a transmission circuit corresponding to a transmission output level in the transmission output control circuit according to the fifth embodiment.

[Explanation of symbols]

 1, 101 transmitting circuit 2, 102 antenna 3, 103 antenna duplexer 4 first switching means 5 first amplifier 6 second switching means 7 second amplifier 8 third switching means 9, 109 gain control amplifier 10 , 110 Upconverter 11, 111 Local oscillation means 12, 112 Quadrature modulation means 13, 113 Baseband signal input terminal (Ich) 14, 114 Baseband signal input terminal (Qch) 15 Switching control means 16 First control terminal 17 2 control terminals 18, 118 third control terminals 19, 119 transmission output control means 20, 120 receiving circuit 21, 121 baseband signal output terminal (Ich) 22, 122 baseband signal output terminal (Qch) 23, 123 level Detecting means 24, 124 demodulating means 25 fourth control terminal 26 fifth control terminal 27 third amplifier 28 fourth amplifier 29 cell radius determining means 30 sixth control terminal 105 amplifier

Claims (12)

[Claims] A transmission output control unit for generating a control signal for controlling a transmission output based on information detected from a reception signal; a gain control amplifier for controlling a gain of the transmission signal based on the control signal; A transmission output control circuit comprising: an amplifier that amplifies a transmission signal whose gain is controlled at a constant amplification factor; and selects either a path for transmitting the transmission signal to the amplifier or a path for transmitting the transmission signal through the amplifier. A switching unit that controls the selection of the switching unit based on a control signal sent from the transmission output control unit, and cuts off power supply to the amplifier when a path that passes through the amplifier is selected. And a switching control means for controlling the transmission output. 2. The transmission output control circuit according to claim 1, wherein one or a plurality of said amplifiers are provided, and said switching means is provided before said amplifiers. 3. The transmission output control circuit according to claim 1, wherein said transmission output control means generates a control signal for controlling a gate bias of said amplifier. 4. An amplifier arranged in parallel with said amplifier, wherein said switching means passes a path for transmitting a transmission signal to one of said amplifiers arranged in parallel or all of these amplifiers. The transmission output control circuit according to any one of claims 1 to 3, wherein one of the transmission signal transmission paths is selected. 5. The transmission output control circuit according to claim 1, wherein said gain control amplifier controls a gain of a transmission signal before being converted into a radio frequency. 6. A position information judging means for identifying position information in a cell in which the cell is located based on information from a base station, wherein the transmission output control means comprises a position identified by the position information judging means. The transmission output control circuit according to any one of claims 1 to 5, wherein switching control of the amplifier is performed in consideration of information. 7. A mobile communication terminal comprising the transmission output control circuit according to claim 1. 8. A transmission output control method for controlling a transmission output of a transmission signal amplified by one or a plurality of amplifiers based on information detected from a reception signal, wherein an amplifier for obtaining a required transmission output is selected. And a method of cutting off the power supply to the amplifiers not selected. 9. The transmission output control method according to claim 8, wherein a gate bias of the selected amplifier is controlled. 10. The transmission output control method according to claim 8, wherein said amplifier for obtaining a required transmission output is selected from amplifiers arranged in parallel. 11. The transmission according to claim 8, wherein the switching of the selection of the amplifier is performed in consideration of positional information in a serving cell detected from a received signal. Output control method. 12. A mobile communication base station inserts position information of a mobile station in a cell in a cell and performs transmission, and the mobile station implements the transmission output control method according to claim 11. A mobile communication system characterized by the above-mentioned.