CN112910446A - Oscillator - Google Patents
Oscillator Download PDFInfo
- Publication number
- CN112910446A CN112910446A CN202110037125.1A CN202110037125A CN112910446A CN 112910446 A CN112910446 A CN 112910446A CN 202110037125 A CN202110037125 A CN 202110037125A CN 112910446 A CN112910446 A CN 112910446A
- Authority
- CN
- China
- Prior art keywords
- switch
- capacitor
- circuit
- current source
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 59
- 238000007599 discharging Methods 0.000 claims abstract description 23
- 230000010355 oscillation Effects 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 3
- 101150110971 CIN7 gene Proteins 0.000 description 1
- 101100286980 Daucus carota INV2 gene Proteins 0.000 description 1
- 101150110298 INV1 gene Proteins 0.000 description 1
- 101100397044 Xenopus laevis invs-a gene Proteins 0.000 description 1
- 101100397045 Xenopus laevis invs-b gene Proteins 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
本发明提供一种振荡器，其包括：电容C1；第一电流源I1；第二电流源I2；比较电路，其用于将所述电容C1上的压降与低电压阈值V1和高电压阈值V2进行比较；阈值电压产生电路，当所述比较电路的输出端输出充电控制信号时，所述阈值电压产生电路的输出端输出高电压阈值V2；当所述比较电路的输出端输出放电控制信号时，所述阈值电压产生电路的输出端输出低电压阈值V1；充放电控制电路，其用于对电容C1进行充放电控制，所述充放电控制电路的控制端与所述比较电路的输出端相连。这样，使得振荡器的稳定性和精度更高，而且还可以实现振荡波形的频率和占空比调整。
The present invention provides an oscillator, which includes: a capacitor C1; a first current source I1; a second current source I2; a comparison circuit for comparing the voltage drop on the capacitor C1 with a low voltage threshold V1 and a high voltage threshold V2 is compared; the threshold voltage generation circuit, when the output end of the comparison circuit outputs a charging control signal, the output end of the threshold voltage generation circuit outputs a high voltage threshold V2; when the output end of the comparison circuit outputs a discharge control signal When , the output terminal of the threshold voltage generating circuit outputs the low voltage threshold V1; the charging and discharging control circuit is used to control the charging and discharging of the capacitor C1, and the control terminal of the charging and discharging control circuit is connected to the output terminal of the comparison circuit. connected. In this way, the stability and precision of the oscillator are higher, and the frequency and duty cycle adjustment of the oscillating waveform can also be realized.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of oscillators, in particular to a high-stability high-precision adjustable voltage-controlled + current-controlled oscillator.
[ background of the invention ]
In many integrated circuit designs, oscillator structures are required to provide clocks, switching signals, etc. At present, RC oscillation, ring oscillator, voltage controlled oscillator, current controlled oscillator and the like with simple structures are generally adopted. High precision typically employs voltage controlled or current controlled oscillators. However, the conventional oscillator is not high in stability and accuracy, and a circuit design for adjusting the frequency and duty ratio of the oscillation waveform is complicated.
Therefore, there is a need for an improved solution to overcome the above problems.
[ summary of the invention ]
An object of the present invention is to provide an oscillator which not only has high stability and accuracy, but also can realize frequency and duty ratio adjustment of an oscillation waveform.
According to one aspect of the present invention, there is provided an oscillator comprising: a capacitance C1; a first current source I1 for charging the capacitance C1; a second current source I2 for discharging the capacitance C1; the comparison circuit is used for comparing the voltage drop of the capacitor C1 with a low voltage threshold V1 and a high voltage threshold V2, and when the voltage drop of the capacitor C1 is smaller than the low voltage threshold V1, the output end of the comparison circuit outputs a charging control signal; when the voltage drop of the capacitor C1 is greater than a high voltage threshold V2, the output end of the comparison circuit outputs a discharge control signal, wherein the low voltage threshold V1 is less than a high voltage threshold V2; a threshold voltage generating circuit, a control terminal of which is connected to the output terminal of the comparing circuit, an output terminal of which outputs the low voltage threshold V1 or the high voltage threshold V2 to the comparing circuit, and an output terminal of which outputs the high voltage threshold V2 when the output terminal of the comparing circuit outputs the charging control signal; when the output end of the comparison circuit outputs a discharge control signal, the output end of the threshold voltage generation circuit outputs a low voltage threshold V1; the charging and discharging control circuit is used for controlling charging and discharging of a capacitor C1, a control end of the charging and discharging control circuit is connected with an output end of the comparison circuit, and when the output end of the comparison circuit outputs a charging control signal, the capacitor C1 is charged by the first current source I1; when the output end of the comparison circuit outputs a discharge control signal, the capacitor C1 is discharged by the second current source I2.
Compared with the prior art, the invention integrates the advantages of the voltage-controlled oscillator and the current-controlled oscillator on the basis of the traditional voltage-controlled or current-controlled oscillator, and introduces the level shift structure, so that the stability and the precision of the oscillator are higher, and the frequency and the duty ratio of the oscillation waveform can be adjusted.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a circuit schematic of an oscillator in one embodiment of the invention;
fig. 2 is a circuit diagram of an oscillator in another embodiment of the invention.
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.
Fig. 1 is a circuit diagram of an oscillator according to an embodiment of the invention. The oscillator shown in fig. 1 includes a capacitor C1, a first current source I1, a second current source I2, a comparison circuit 110, a threshold voltage generation circuit 120, and a charge and discharge control circuit (not identified).
The first current source I1 is used to charge the capacitor C1. The second current source I2 is used to discharge the capacitor C1.
The comparison circuit 110 is configured to compare a voltage drop across the capacitor C1 with a low voltage threshold V1 (or a first voltage threshold) and a high voltage threshold V2 (or a second voltage threshold), where an output terminal of the comparison circuit 110 outputs a charging control signal (or a first level signal) when the voltage drop across the capacitor C1 is smaller than the low voltage threshold V1, and the output terminal of the comparison circuit 110 outputs a discharging control signal (or a second level signal) when the voltage drop across the capacitor C1 is larger than the high voltage threshold V2, where the low voltage threshold V1 is smaller than the high voltage threshold V2. In one embodiment, the charge control signal may be a high level signal and the discharge control signal may be a low level signal. In another embodiment, the charge control signal may be a low level signal and the discharge control signal may be a high level signal.
The control terminal of the threshold voltage generating circuit 120 is connected to the output terminal of the comparing circuit 110, and the output terminal thereof outputs the low voltage threshold V1 or the high voltage threshold V2 to the comparing circuit 110, when the output terminal of the comparing circuit 110 outputs the charging control signal, the output terminal of the threshold voltage generating circuit 120 outputs the high voltage threshold V2, and when the output terminal of the comparing circuit 110 outputs the discharging control signal, the output terminal of the threshold voltage generating circuit 120 outputs the low voltage threshold V1.
The charging and discharging control circuit is used for controlling charging and discharging of the capacitor C1, a control end of the charging and discharging control circuit is connected with an output end of the comparison circuit 110, when the output end of the comparison circuit 110 outputs a charging control signal, the capacitor C1 is charged by the first current source I1, and when the output end of the comparison circuit 110 outputs a discharging control signal, the capacitor C1 is discharged by the second current source I2.
In the embodiment shown in fig. 1, the cathode of the first current source I1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded; the anode of the second current source I2 is connected to one end of the capacitor C1, and the cathode thereof is connected to the other end of the capacitor C1.
In the embodiment shown in fig. 1, the comparison circuit 110 may be a comparator or an operational amplifier, and a first input terminal of the comparison circuit 110 is connected to one terminal of the capacitor C1, and a second input terminal thereof is connected to the output terminal of the threshold voltage generation circuit 120. In the specific embodiment shown in fig. 1, the first input terminal and the second input terminal of the comparison circuit 110 are the non-inverting input terminal and the inverting input terminal of a comparator or an operational amplifier, respectively.
In the specific embodiment shown in fig. 1, the charge and discharge control circuit includes a first switch K1 and a second switch K2, a control terminal of the first switch K1 and a control terminal of the second switch K2 constitute a control terminal of the charge and discharge control circuit, wherein the first switch K1 is connected between a negative electrode of the first current source I1 and one end of the capacitor C1; a second switch K2 is connected in series with a second current source I2 between one end and the other end of the capacitor C1. When the output end of the comparison circuit 110 outputs the charging control signal, the first switch K1 is turned on, the second switch K2 is turned off, the capacitor C1 is charged by the first current source I1, and when the output end of the comparison circuit 110 outputs the discharging control signal, the first switch K1 is turned off, the second switch K2 is turned on, and the capacitor C1 is discharged by the second current source I2.
In the embodiment shown in fig. 1, the threshold voltage generation circuit 120 includes a first reference voltage Vref1, a second reference voltage Vref1, and a level-shifted voltage VF, and the low voltage threshold V1 output by the threshold voltage generation circuit 120 is the sum of the first reference voltage Vref1 and the level-shifted voltage VF (i.e., V1 equals Vref1+ VF); the high voltage threshold V2 output by the threshold voltage generation circuit 120 is the sum of the second reference voltage Vref2 and the level shift voltage VF (i.e., V2 is equal to Vref2+ VF), wherein the level shift voltage VF may be a positive value or a negative value.
In the specific embodiment shown in fig. 1, the threshold voltage generating circuit 120 further includes a level shifting circuit 122, a third switch K3 and a fourth switch K4, a control terminal of the third switch K3 and a control terminal of the fourth switch K4 constitute a control terminal of the threshold voltage generating circuit 120, wherein one terminal of the third switch K3 is connected to the second reference voltage Vref2, the other terminal thereof is connected to the input terminal of the level shifting circuit 122, and the control terminal thereof is connected to the output terminal of the comparing circuit 110; one end of the fourth switch K4 is connected to the first reference voltage Vref1, the other end thereof is connected to the input end of the level shift circuit 122, and the control end thereof is connected to the output end of the comparison circuit 110; the output terminal of the level shift circuit 122 serves as the output terminal of the threshold voltage generation circuit 120, and the level shift circuit 122 is configured to add the voltage at its input terminal to the level-shifted voltage VF generated inside thereof and output the result of the addition through its output terminal.
When the output terminal of the comparison circuit 110 outputs the charging control signal, the third switch K3 is turned on, the fourth switch K4 is turned off, and at this time, the second reference voltage Vref2 is level-shifted by the level shift circuit 122 and then sent to the second input terminal of the comparison circuit 110, that is, the threshold voltage generation circuit 120 outputs the high voltage threshold V2, where the high voltage threshold V2 is the sum of the second reference voltage Vref2 and the level-shifted voltage VF (that is, V2 is Vref2+ VF); when the output terminal of the comparison circuit 110 outputs the discharge control signal, the third switch K3 is turned off, and the fourth switch K4 is turned on, so that the first reference voltage Vref1 is level-shifted by the level shift circuit 122 and then sent to the second input terminal of the comparison circuit 110, that is, the threshold voltage generation circuit 120 outputs the low voltage threshold V1, where the low voltage threshold V1 is the sum of the first reference voltage Vref1 and the level-shifted voltage VF (that is, V1 is Vref1+ VF). In the embodiment shown in fig. 1, the level shift circuit 122 is a dc level shift circuit, and further includes a third current source I3, a cathode of the third current source I3 is connected to the output terminal of the level shift circuit 122, and the third current source I3 provides a bias current for the level shift circuit 122.
In summary, when the third switch K3 is turned on and the fourth switch K4 is turned off, the threshold voltage generation circuit 120 outputs the high voltage threshold V2; when the third switch K3 is turned off and the fourth switch K4 is turned on, the threshold voltage generating circuit 120 outputs the low voltage threshold V1, so that the voltage at the second input terminal of the comparing circuit 110 has two states, i.e., a low voltage threshold V1 and a high voltage threshold V2. The voltage at the first input terminal of the comparison circuit 110 is a voltage drop across the capacitor C1, and when the capacitor C1 is charged or discharged, and the voltage of the capacitor C1 reaches the threshold values of the low voltage threshold V1 and the high voltage threshold V2, the output state of the comparison circuit 110 is inverted, so as to switch the conduction state of the third switch K3 or the fourth switch K4, and send different reference voltages to the level shift circuit 122, so as to generate oscillation repeatedly.
Specifically, when the output end of the comparison circuit 110 outputs the charging control signal, the switches K1 and K3 are turned on, the switches K2 and K4 are turned off, the voltage at the inverting input end of the comparison circuit 110 is the high voltage threshold V2 (i.e., V2 ═ Vref2+ VF), and the capacitor C1 is charged by the first current source I1; when the voltage at the non-inverting input terminal of the comparison circuit 110 (i.e., the voltage of the capacitor C1) exceeds the high voltage threshold V2, the output of the comparison circuit 110 is inverted, that is, the output terminal of the comparison circuit 110 outputs the discharge control signal, so that the switches K1 and K3 are turned off, the switches K2 and K4 are turned on, the voltage at the inverting input terminal of the comparison circuit 110 becomes the low voltage threshold V1 (i.e., V1 is Vref1+ VF), and the capacitor C1 is discharged by the second current source I2; when the voltage at the non-inverting input terminal of the comparing circuit 110 (i.e., the voltage of the capacitor C1) is lower than the low voltage threshold V1, the output of the comparing circuit 110 is inverted again, the output terminal of the comparing circuit 110 outputs the charging control signal again, and the charging mode is entered again.
The oscillating waveform can be taken from the output of the comparison circuit 110 or its associated subsequent stage. In one embodiment, an oscillator output (not shown) is connected to the output of the comparison circuit 110, and the oscillating signal output by the oscillator output is a square wave signal.
In one embodiment, by adjusting the size and the ratio of the first current source I1 and the second current source I2, the adjustment of the frequency and the duty ratio of the oscillation signal can be realized; by adjusting the first reference voltage Vref1 and/or the second reference voltage Vref2, frequency adjustment of the oscillation signal can be achieved.
It should be noted that the first switch K1 and the second switch K2 can only be turned on one at the same time, the third switch K3 and the fourth switch K4 can only be turned on one at the same time, the inverters INV1 and INV2 are used to control the switches K1, K2, K3, and K4, and the specific number and type are not limited, and only one of the switches K1 and K2 and one of the switches K3 and K4 need to be turned on at the same time.
Fig. 2 is a schematic circuit diagram of an oscillator according to another embodiment of the invention. Fig. 2 is substantially the same as the oscillator circuit shown in fig. 1, except that: the charge and discharge control circuit shown in fig. 2 omits the switch K1 in fig. 1, and the first current source I1 is always in a conducting state; the first reference voltage Vref1 in fig. 2 selects the ground level (or ground); the comparator circuit 210 in fig. 2 employs a comparator.
Since the charge and discharge control circuit shown in fig. 2 eliminates the switch K1 in fig. 1, the charge and discharge control circuit shown in fig. 2 includes only the second switch K2. The second switch K2 and the second current source I2 are connected in series between one end and the other end of the capacitor C1, when the output end of the comparison circuit 110 outputs a charging control signal, the second switch K2 is turned off, the capacitor C1 is charged by the first current source I1, when the output end of the comparison circuit 110 outputs a discharging control signal, the second switch K2 is turned on, the capacitor C1 is discharged by the second current source I2, and since the first current source I1 is always in an on state, the discharging current is I2-I1, wherein I2 is the current value of the second current source I2, and I1 is the current value of the first current source I1.
It should be noted that, in the charge and discharge control circuit in fig. 2, the switch K1 in fig. 1 is eliminated, and only one switch K2 is provided, so that the current magnitudes of the first current source I1 and the second current source I2 need to be different, specifically, the current of the second current source I2 is greater than the current of the first current source I1. Since the charge and discharge control circuit in fig. 1 includes two switches K1 and K2, there is no limitation on the current magnitudes of the first current source I1 and the second current source I2. In yet another embodiment of the oscillator of the present invention, the charge and discharge control circuit may omit the switch K2 in fig. 1, and only have a switch K1, the current of the second current source I2 is smaller than the current of the first current source I1.
Since the first reference voltage Vref1 in fig. 2 selects the ground level, the low voltage threshold V1 of the inverting input of the comparator 210 is equal to the level-shifted voltage VF (i.e., V1 is equal to VF), and the high voltage threshold V2 is the sum of the second reference voltage Vref2 and the level-shifted voltage VF (i.e., V2 is equal to Vref2+ VF).
When the output end of the comparator 210 outputs the charging control signal, the switch K3 is turned on, the switches K2 and K4 are turned off, the voltage at the inverting input end of the comparator 210 is a high voltage threshold V2 (i.e., V2 — Vref2+ VF), and the capacitor C1 is charged by the first current source I1; when the voltage at the non-inverting input terminal of the comparator 210 (i.e., the voltage of the capacitor C1) exceeds the high voltage threshold V2, the output of the comparator 210 is inverted, that is, the output terminal of the comparator 210 outputs the discharge control signal, so that the switch K3 is turned off, the switches K2 and K4 are turned on, the voltage at the inverting input terminal of the comparator 210 becomes the low voltage threshold V1 (i.e., V1 is VF), the capacitor C1 is discharged by the second current source I2, and the discharge current is I2-I1 because the first current source I1 is always in the on state; when the voltage at the non-inverting input terminal of the comparator 210 (i.e., the voltage of the capacitor C1) is lower than the low voltage threshold V1, the output of the comparator 210 is inverted again, the output terminal of the comparator 210 outputs the charging control signal again, and the charging mode is entered again.
In one embodiment, by adjusting the size and the ratio of the first current source I1 and the second current source I2, the adjustment of the frequency and the duty ratio of the oscillation signal can be realized; by adjusting the second reference voltage Vref2, the frequency of the oscillation signal can be easily changed.
In the embodiment shown in fig. 1 and 2, due to the level shift circuit 122, the voltage jump of the oscillator will be isolated by the level shift circuit 122, and will not affect the reference voltages Vref1, Vref2 and their associated stability of the result.
The oscillator design of the invention can improve the stability of the oscillator (the reference voltages Vref1 and Vref2 are not interfered, and the stability of the oscillator is improved in turn); on the other hand, the frequency of the oscillation signal can be accurately controlled by adjusting the reference voltages Vref1, Vref 2; in addition, the structure has stable frequency output in a wide power supply voltage range.
In summary, the oscillator of the present invention integrates the advantages of the voltage-controlled oscillator and the current-controlled oscillator based on the conventional voltage-controlled or current-controlled oscillator, and introduces the level shift structure, so that the present invention has the following advantages:
the stability is higher, and the frequency can be basically not influenced by the power supply voltage (within a normal working range);
secondly, the precision is higher, and the adjustment is easy;
and thirdly, the isolation is performed by the level shift circuit 120, so that the influence on peripheral circuits is small, and particularly, the reference voltages Vref1 and Vref2 are not influenced.
And adjusting the frequency and the duty ratio of the oscillation signal by adjusting the size and the proportion of the current source I, I2.
In the present invention, the terms "connected", "connecting", and the like mean electrical connections, and direct or indirect electrical connections unless otherwise specified.
It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (12)
1. An oscillator, characterized in that it comprises:
a capacitance C1;
a first current source I1 for charging the capacitance C1;
a second current source I2 for discharging the capacitance C1;
the comparison circuit is used for comparing the voltage drop of the capacitor C1 with a low voltage threshold V1 and a high voltage threshold V2, and when the voltage drop of the capacitor C1 is smaller than the low voltage threshold V1, the output end of the comparison circuit outputs a charging control signal; when the voltage drop of the capacitor C1 is greater than a high voltage threshold V2, the output end of the comparison circuit outputs a discharge control signal, wherein the low voltage threshold V1 is less than a high voltage threshold V2;
a threshold voltage generating circuit, a control terminal of which is connected to the output terminal of the comparing circuit, an output terminal of which outputs the low voltage threshold V1 or the high voltage threshold V2 to the comparing circuit, and an output terminal of which outputs the high voltage threshold V2 when the output terminal of the comparing circuit outputs the charging control signal; when the output end of the comparison circuit outputs a discharge control signal, the output end of the threshold voltage generation circuit outputs a low voltage threshold V1;
the charging and discharging control circuit is used for controlling charging and discharging of a capacitor C1, a control end of the charging and discharging control circuit is connected with an output end of the comparison circuit, and when the output end of the comparison circuit outputs a charging control signal, the capacitor C1 is charged by the first current source I1; when the output end of the comparison circuit outputs a discharge control signal, the capacitor C1 is discharged by the second current source I2.
2. The oscillator of claim 1, further comprising an oscillator output,
the output end of the oscillator is connected with the output end of the comparison circuit,
the oscillation signal output by the output end of the oscillator is a square wave signal.
3. The oscillator of claim 1,
the cathode of the first current source I1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is grounded;
the anode of the second current source I2 is connected to one end of the capacitor C1, and the cathode thereof is connected to the other end of the capacitor C1.
4. The oscillator of claim 3,
the comparison circuit is a comparator or an operational amplifier,
the first input end of the comparison circuit is connected with one end of the capacitor C1, and the second input end of the comparison circuit is connected with the output end of the threshold voltage generation circuit.
5. The oscillator of claim 3,
the charge and discharge control circuit comprises a first switch K1 and a second switch K2,
the first switch K1 is connected between the cathode of the first current source I1 and one end of the capacitor C1;
the second switch K2 and the second current source I2 are connected in series between one end and the other end of the capacitor C1;
when the output end of the comparison circuit outputs a charging control signal, the first switch K1 is turned on, the second switch K2 is turned off, the capacitor C1 is charged by the first current source I1, and when the output end of the comparison circuit outputs a discharging control signal, the first switch K1 is turned off, the second switch K2 is turned on, and the capacitor C1 is discharged by the second current source I2.
6. The oscillator of claim 3,
the charge and discharge control circuit includes a second switch K2,
the second switch K2 and the second current source I2 are connected in series between one end and the other end of the capacitor C1;
the current of the second current source is greater than the current of the first current source;
when the output end of the comparison circuit outputs a charging control signal, the second switch K2 is turned off, the capacitor C1 is charged by the first current source I1, and when the output end of the comparison circuit outputs a discharging control signal, the second switch K2 is turned on, and the capacitor C1 is discharged by the second current source I2.
7. The oscillator of claim 1,
the threshold voltage generating circuit includes a first reference voltage Vref1, a second reference voltage Vref2, and a level-shifted voltage VF,
the low voltage threshold V1 output by the threshold voltage generation circuit is the sum of the first reference voltage Vref1 and the level-shifted voltage VF;
the high voltage threshold V2 output by the threshold voltage generation circuit is the sum of the second reference voltage Vref2 and the level-shifted voltage VF,
the level shift voltage VF is a positive value or a negative value.
8. The oscillator of claim 7,
the threshold voltage generating circuit further includes a level shift circuit, a third switch K3 and a fourth switch K4,
one end of the third switch K3 is connected to the second reference voltage Vref2, the other end thereof is connected to the input end of the level shift circuit, and the control end thereof is connected to the output end of the comparison circuit;
one end of the fourth switch K4 is connected to the first reference voltage Vref1, the other end thereof is connected to the input end of the level shift circuit, and the control end thereof is connected to the output end of the comparison circuit;
the output end of the level shift circuit is used as the output end of the threshold voltage generation circuit, and the level shift circuit is used for adding the voltage of the input end of the level shift circuit and the level shift voltage VF generated in the level shift circuit and outputting the addition result through the output end of the level shift circuit.
9. The oscillator of claim 8,
when the output end of the comparison circuit outputs a charging control signal, the third switch K3 is turned on, and the fourth switch K4 is turned off;
when the output end of the comparison circuit outputs a discharging control signal, the third switch K3 is turned off, and the fourth switch K4 is turned on.
10. The oscillator of claim 1,
the adjustment of the frequency and the duty ratio of the oscillation signal is realized by adjusting the size and the proportion of the first current source I1 and the second current source I2.
11. The oscillator of claim 7,
the frequency adjustment of the oscillation signal is realized by adjusting the first reference voltage Vref1 and/or the second reference voltage Vref 2.
12. The oscillator of claim 7,
the first reference voltage Vref1 is at ground level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110037125.1A CN112910446A (en) | 2021-01-12 | 2021-01-12 | Oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110037125.1A CN112910446A (en) | 2021-01-12 | 2021-01-12 | Oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112910446A true CN112910446A (en) | 2021-06-04 |
Family
ID=76112549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110037125.1A Pending CN112910446A (en) | 2021-01-12 | 2021-01-12 | Oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112910446A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517879A (en) * | 2021-06-24 | 2021-10-19 | 上海芯龙半导体技术股份有限公司南京分公司 | Oscillator Circuits and Chips |
| CN115913120A (en) * | 2022-12-19 | 2023-04-04 | 南京微盟电子有限公司 | Automatic frequency conversion oscillator with narrow range near central frequency |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003188693A (en) * | 2001-12-20 | 2003-07-04 | Nec Kansai Ltd | Oscillation circuit |
| CN201066834Y (en) * | 2007-07-13 | 2008-05-28 | 绿达光电(苏州)有限公司 | Single switch control oscillator with frequency adjusting function |
| CN103546123A (en) * | 2013-11-01 | 2014-01-29 | 东南大学 | A High Linearity Relaxation Oscillator |
| CN106209027A (en) * | 2016-07-20 | 2016-12-07 | 珠海全志科技股份有限公司 | Relaxor and monolithic die |
-
2021
- 2021-01-12 CN CN202110037125.1A patent/CN112910446A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003188693A (en) * | 2001-12-20 | 2003-07-04 | Nec Kansai Ltd | Oscillation circuit |
| CN201066834Y (en) * | 2007-07-13 | 2008-05-28 | 绿达光电(苏州)有限公司 | Single switch control oscillator with frequency adjusting function |
| CN103546123A (en) * | 2013-11-01 | 2014-01-29 | 东南大学 | A High Linearity Relaxation Oscillator |
| CN106209027A (en) * | 2016-07-20 | 2016-12-07 | 珠海全志科技股份有限公司 | Relaxor and monolithic die |
Non-Patent Citations (1)
| Title |
|---|
| 袁涛等: "一种CMOS电流控制振荡器的分析与设计", 微电子学, no. 6, 20 December 2005 (2005-12-20) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517879A (en) * | 2021-06-24 | 2021-10-19 | 上海芯龙半导体技术股份有限公司南京分公司 | Oscillator Circuits and Chips |
| CN113517879B (en) * | 2021-06-24 | 2021-12-03 | 上海芯龙半导体技术股份有限公司南京分公司 | Oscillator circuit and chip |
| CN115913120A (en) * | 2022-12-19 | 2023-04-04 | 南京微盟电子有限公司 | Automatic frequency conversion oscillator with narrow range near central frequency |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112234957B (en) | Analog oscillator circuit with negative feedback regulation function | |
| CN107040210B (en) | RC oscillator and DC-DC power chip | |
| CN112929009B (en) | RC relaxation oscillator | |
| CN102324912A (en) | Current control oscillator | |
| CN206790441U (en) | A kind of RC oscillators and DC D/C power chip | |
| US20200235702A1 (en) | Low power crystal oscillator | |
| CN106788338A (en) | RC oscillating circuits | |
| CN112953526B (en) | Ring oscillation circuit, method and integrated chip | |
| CN107508579A (en) | A kind of electric charge transfer RC relaxors | |
| CN112910446A (en) | Oscillator | |
| CN112311360A (en) | High-precision oscillator without reference clock | |
| CN206432966U (en) | RC oscillating circuits | |
| CN215072364U (en) | Annular oscillation circuit and integrated chip | |
| CN105703712B (en) | High precision RC oscillator | |
| US10879858B2 (en) | Oscillator circuit using comparator | |
| CN106026983B (en) | A kind of ring oscillator | |
| CN115459747B (en) | Sawtooth wave generating circuit with phase detection function and control method thereof | |
| CN103825555B (en) | A kind of oscillating circuit | |
| CN113691220B (en) | On-chip low frequency oscillator | |
| CN114665820A (en) | Oscillator circuit | |
| CN215581086U (en) | Triangular wave generating circuit applied to analog jitter frequency technology | |
| CN110752826B (en) | External RC frequency adjustable oscillator | |
| CN110121043B (en) | Display power supply device and display system | |
| CN211531068U (en) | Self-excited multivibrator circuit | |
| CN116633316B (en) | A clock generating circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |