CN102710912B - Tuner for receiving satellite television signal - Google Patents
Tuner for receiving satellite television signal Download PDFInfo
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- CN102710912B CN102710912B CN201210185686.7A CN201210185686A CN102710912B CN 102710912 B CN102710912 B CN 102710912B CN 201210185686 A CN201210185686 A CN 201210185686A CN 102710912 B CN102710912 B CN 102710912B
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- 230000005669 field effect Effects 0.000 claims abstract description 47
- 230000003321 amplification Effects 0.000 claims abstract description 21
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011889 copper foil Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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Abstract
The invention provides a tuner for receiving a satellite television signal, and the tuner comprises a high-frequency adapter, an adapter seat, a guided wave drum, a wave collector and a circuit box, wherein the guided wave drum and the wave collector are respectively of a cylindrical shape, the inner wall of the guided wave drum is provided with a plurality of medium plate slot, and the adapter seat, the guided wave drum, the wave collector and the circuit box are integrally connected with one another. A circuit board which is installed inside the circuit box comprises a control chip unit, a high-frequency amplification unit, a band pass filter (BPF) circuit unit, a medium DR local oscillator unit, an N-channel passive field effect tube (FET) resistance frequency mixer and a middle-frequency output amplification circuit unit, and a satellite radio frequency (RF) signal is outputted to the high-frequency adapter through the circuit board. The tuner for receiving the satellite television signal has advantages that by adopting the cylindrical guided wave drum and the cylindrical wave collector, the size is reduced, and the weight is reduced. The frequency mixing part of the circuit board adopts the N-channel passive FET resistance frequency mixer unit, so that on the premise of ensuring the stable performance, the application power consumption is further reduced, the gain is improved, the noise is reduced, and the application of the consumable is also reduced.
Description
Technical field
The present invention relates to high-frequency signal low-noise amplifying frequency demultiplier, particularly a kind of for receiving the tuner of satellite TV signal.
Background technology
At present, conventional tuner generally includes switching headstock and is located at the waveguide cylinder of lower head, and guided wave cylinder below connects again trumpet type interface conventionally, is commonly called as wave collecting device.Conventionally wave collecting device volume is larger.The effect of tuner is to receive satellite TV signal, and carries out channel selection, signal amplification and down conversion process, the signal of final stable output.Wherein frequency mixer generally all adopts non-linear element to realize, but as long as adopting nonlinear device to remove mixing operation, just inevitably can produce relatively high crosstalk, clutter response and other nonlinear distortion.
In traditional diode mixer, the defect of distortion is obvious, and in addition, the noise of diode mixer comprises shot noise and thermal noise, and its noise is also higher.
For the energy-conservation requirement of response national environmental protection, must be optimized wave collecting device, obtain the tuner that volume is little, gain is strong, noise is low, reduce consumptive material and use, become a new important topic.
Summary of the invention
Object of the present invention is exactly the above-mentioned defect that will overcome prior art, provide that a kind of volume is little, lightweight, gain is strong, noise is low for receiving the tuner of satellite TV signal.
For reaching above-mentioned purpose, it is provided by the invention that for receiving, the tuner of satellite TV signal comprises high-frequency adapter head and transfer headstock, guided wave cylinder, wave collecting device and circuit box, the upper end of described guided wave cylinder is connected with described switching headstock, the lower end of described guided wave cylinder is connected with described wave collecting device, described guided wave cylinder and wave collecting device are cylindrical shape, described circuit box is connected with the lateral wall of described guided wave cylinder with described switching headstock, and described switching headstock, guided wave cylinder, wave collecting device and described circuit box one are connected;
In described circuit box, circuit board is installed, described circuit board comprises control chip unit, High frequency amplification unit, BPF bandwidth-limited circuit unit, medium DR local oscillator unit, the resistive mixer unit of the passive field effect transistor FET of N raceway groove and intermediate frequency output amplifier unit, described High frequency amplification unit, BPF bandwidth-limited circuit unit, the resistive mixer unit of the passive field effect transistor FET of N raceway groove is connected successively with intermediate frequency output amplifier unit, described control chip unit is connected respectively with described intermediate frequency output amplifier unit with described High frequency amplification unit, described control chip unit is connected with the resistive mixer unit of the passive field effect transistor FET of described N raceway groove through described medium DR local oscillator unit, described High frequency amplification unit receives RF signal, described intermediate frequency output amplifier unit is connected with described high-frequency adapter head,
The satellite RF signal receiving is after described high-frequency amplifier circuit amplifies, access described BPF bandwidth-limited circuit unit filtering interference signals, send into the resistive mixer unit of the passive field effect transistor FET of described N raceway groove and medium DR local oscillator unit carries out signal mixing, the resistive mixer unit output of the passive field effect transistor FET of described N raceway groove intermediate-freuqncy signal also exports described high-frequency adapter head to through described intermediate frequency output amplifier unit again.
The present invention is for receiving the tuner of satellite TV signal, and the inwall of wherein said guided wave cylinder is provided with 4 dieelctric sheet slots parallel with described guided wave cylinder central axis, and described dieelctric sheet slot is distributed on the inwall with described guided wave cylinder.
The present invention is for receiving the tuner of satellite TV signal, wherein said High frequency amplification unit is connected to described control chip unit by the first resistance to the three resistance respectively, described BPF bandwidth-limited circuit unit is connected between described High frequency amplification unit and the resistive mixer unit of the passive field effect transistor FET of described N raceway groove by Copper Foil, the resistive mixer unit of the passive field effect transistor FET of described N raceway groove is connected to described BPF bandwidth-limited circuit unit by Copper Foil, and be connected to described medium DR local oscillator unit by the first electric capacity, be connected to described intermediate frequency output amplifier unit by the second electric capacity simultaneously, the resistive mixer unit of the passive field effect transistor FET of described N raceway groove is connected to described intermediate frequency output amplifier unit by Copper Foil.
The present invention is for receiving the tuner of satellite TV signal, the resistive mixer unit of the passive field effect transistor FET of wherein said N raceway groove comprises the 4th resistance and N channel field-effect pipe FET pipe, described the 4th resistance one end ground connection, one end is connected to the grid junction of described BPF bandwidth-limited circuit unit and described N channel field-effect pipe FET pipe in addition, the grid of described N channel field-effect pipe FET pipe is connected to described the 4th resistance and junction, described BPF bandwidth-limited circuit unit, the source ground of described N channel field-effect pipe FET pipe, the drain electrode of described N channel field-effect pipe FET pipe is connected with described medium DR local oscillator unit, and be connected with described intermediate frequency output amplifier unit by one group of printed inductance.
The advantage that the present invention is used for the tuner that receives satellite TV signal is: owing to having adopted columnar guided wave cylinder and wave collecting device, wave collecting device is optimized for and is directly stretched shape by loudspeaker conical in shape, reduce volume and reach 1/3, alleviated weight.The mixing part of circuit board adopts the resistive mixing of the passive field effect transistor FET of N raceway groove unit, under the stable prerequisite of guaranteed performance, has further reduced use power consumption, has improved gain, has reduced noise, also reduces consumptive material and uses.
Brief description of the drawings
Fig. 1 is the structural representation of tuner of the present invention;
Fig. 2 is the broken section structural representation of tuner of the present invention;
Fig. 3 is the operation principle block diagram of circuit board in tuner of the present invention;
Fig. 4 is the circuit diagram of circuit board in tuner of the present invention.
In accompanying drawing: 1. high-frequency adapter head, 2. switching headstock, 3. circuit box, 4. guided wave cylinder, 5. dieelctric sheet slot, 6. wave collecting device, 7. circuit board.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing a kind of for receiving the embodiment of tuner of satellite TV signal.
See figures.1.and.2, provided by the invention for receiving, the tuner of satellite TV signal comprises high-frequency adapter head 1 and transfer headstock 2, guided wave cylinder 4, wave collecting device 6 and circuit box 3.
The upper end of guided wave cylinder 4 is connected with switching headstock 2, and the lower end of guided wave cylinder 4 is connected with wave collecting device 6.Guided wave cylinder 4 and wave collecting device 6 are cylindrical shape, and its inwall is provided with 4 dieelctric sheet slots 5, and dieelctric sheet slot 5 is distributed on the inwall of guided wave cylinder 4 and is parallel with guided wave cylinder central axis.Circuit box 3 is connected with the lateral wall of guided wave cylinder 4 with switching headstock 2, and its position is necessary to the effect for the tuner that receives satellite TV signal provided by the invention.Switching headstock 2, guided wave cylinder 4, wave collecting device 6 are connected with circuit box 3 one.This structure can make provided by the invention for receive satellite TV signal tuner volume reduce 1/3.
Circuit board 7 is installed in circuit box 3.The present invention considers for the tuner technology that receives satellite TV signal: there is no nonlinear time varying element if adopt one, just can realize the frequency mixer that there is no distortion.Field effect transistor can realize this point.It is little that this frequency mixer has distortion, and 1/f noise is low, there is no the advantage of shot noise, and its conversion loss is suitable with diode mixer.In the time that drain-source voltage is lower or be 0, field effect transistor FET raceway groove can well be approximately a linear resistance.The resistance of this linear raceway groove is modulated by the RF voltage on grid.Because the variation of grid voltage can change the degree of depth of depletion region under grid, thus the value of change channel resistance.When grid voltage is during lower than cut-in voltage Vt, raceway groove resistance is equivalent to very greatly open circuit; And in the time that grid voltage exceedes maximum, channel resistance will drop to several ohm.This excursion is enough for a resistive frequency mixer.In addition, field effect transistor FET raceway groove is pure resistance, and its noise is almost thermal noise completely.The equivalent noise temperature of field effect transistor FET resistance frequency mixer equals the physical temperature of frequency mixer, lower than diode mixer.Because the noise of diode mixer comprises shot noise and thermal noise.
With reference to Fig. 3, circuit board 7 comprises control chip unit 12, High frequency amplification unit 8, BPF bandwidth-limited circuit unit 9, medium DR local oscillator unit 10, the resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove and intermediate frequency output amplifier unit 13.
High frequency amplification unit 8, BPF bandwidth-limited circuit unit 9, the resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove are connected successively with intermediate frequency output amplifier unit 13.Control chip unit 12 is connected respectively with intermediate frequency output amplifier unit 13 with High frequency amplification unit 8.Control chip unit 12 is connected with the resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove through medium DR local oscillator unit 10.High frequency amplification unit 8 receives RF signal, and intermediate frequency output amplifier unit 13 is connected with high-frequency adapter head 1.
In conjunction with reference to Fig. 4, High frequency amplification unit 8 is connected to control chip unit 12 by the first resistance R 1 to the 3rd resistance R 3 respectively.BPF bandwidth-limited circuit unit 9 is connected between High frequency amplification unit 8 and the resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove by Copper Foil.The resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove is connected to BPF bandwidth-limited circuit unit 9 by Copper Foil, and is connected to medium DR local oscillator unit 10 by the first capacitor C 15, is connected to intermediate frequency output amplifier unit 13 by the second capacitor C 19 simultaneously.The resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove is connected to intermediate frequency output amplifier unit 13 by Copper Foil.
Wherein, the resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove comprises the 4th resistance R 4 and N channel field-effect pipe FET pipe Q4, the 4th resistance R 4 one end ground connection, one end is connected to the grid junction of BPF bandwidth-limited circuit unit 9 and N channel field-effect pipe FET pipe Q4 in addition, the grid of N channel field-effect pipe FET pipe Q4 is connected to the 4th resistance R 4 and 9 junctions, BPF bandwidth-limited circuit unit, the source ground of N channel field-effect pipe FET pipe Q4, the drain electrode of N channel field-effect pipe FET pipe Q4 is connected with medium DR local oscillator unit 10, and be connected with intermediate frequency output amplifier unit 13 by one group of printed inductance.
Be used for the embodiment of the tuner that receives satellite TV signal in the present invention, the course of work of tuner is: the satellite RF signal of reception is after high-frequency amplifier circuit 8 amplifies, access BPF bandwidth-limited circuit unit 9 filtering interference signals, send into the resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove and medium DR local oscillator unit 10 again and carry out signal mixing, the resistive mixer unit 11 of the passive field effect transistor FET of N raceway groove is exported intermediate-freuqncy signal and is exported high-frequency adapter head 1 to through intermediate frequency output amplifier unit 13.The GB of tuner gain is 55db, and the GB of noise is 1.3, and the present invention brings up to 65db for the tuner gain that receives satellite TV signal, and reducing noise is 0.8, and received signal quality is improved.
Embodiment recited above is described the preferred embodiment of the present invention, not the spirit and scope of the present invention is limited.Do not departing under the prerequisite of design concept of the present invention; various modification and improvement that this area ordinary person makes technical scheme of the present invention; all should drop into protection scope of the present invention, the technology contents of request protection of the present invention, has all been documented in claims.
Claims (4)
1. one kind for receiving the tuner of satellite TV signal, comprise high-frequency adapter head (1) and switching headstock (2) thereof, guided wave cylinder (4), wave collecting device (6) and circuit box (3), the upper end of described guided wave cylinder (4) is connected with described switching headstock (2), the lower end of described guided wave cylinder (4) is connected with described wave collecting device (6), it is characterized in that: described guided wave cylinder (4) and wave collecting device (6) are cylindrical shape, the inwall of described guided wave cylinder (4) is provided with several dieelctric sheet slots (5) parallel with described guided wave cylinder central axis, described circuit box (3) is connected with the lateral wall of described guided wave cylinder (4) with described switching headstock (2), described switching headstock (2), guided wave cylinder (4), wave collecting device (6) and described circuit box (3) interconnect and are integrated,
Described circuit box is provided with circuit board in (3), described circuit board (7) comprises control chip unit (12), High frequency amplification unit (8), BPF bandwidth-limited circuit unit (9), medium DR local oscillator unit (10), the resistive mixer unit of the passive field effect transistor FET of N raceway groove (11) and intermediate frequency output amplifier unit (13), described High frequency amplification unit (8), BPF bandwidth-limited circuit unit (9), the resistive mixer unit of the passive field effect transistor FET of N raceway groove (11) is connected successively with intermediate frequency output amplifier unit (13), described control chip unit (12) is connected respectively with described intermediate frequency output amplifier unit (13) with described High frequency amplification unit (8), described control chip unit (12) is connected with described intermediate frequency output amplifier unit (13) through described medium DR local oscillator unit (10), described High frequency amplification unit (8) receives RF signal, described intermediate frequency output amplifier unit (13) is connected with described high-frequency adapter head (1),
The satellite RF signal receiving is after described high-frequency amplifier circuit (8) amplifies, access described BPF bandwidth-limited circuit unit (9) filtering interference signals, send into the resistive mixer unit of the passive field effect transistor FET of described N raceway groove (11) again and carry out signal mixing with medium DR local oscillator unit (10), the resistive mixer unit of the passive field effect transistor FET of described N raceway groove (11) output intermediate-freuqncy signal also exports described high-frequency adapter head (1) to through described intermediate frequency output amplifier unit (13).
2. according to claim 1 for receiving the tuner of satellite TV signal, it is characterized in that: wherein said dieelctric sheet slot (5) is 4, be distributed on the inwall with described guided wave cylinder.
3. according to claim 1 and 2 for receiving the tuner of satellite TV signal, it is characterized in that: wherein said High frequency amplification unit (8) is connected to described control chip unit (12) by the first resistance (R1) to the 3rd resistance (R3) respectively, described BPF bandwidth-limited circuit unit (9) is connected between described High frequency amplification unit (8) and the resistive mixer unit of the passive field effect transistor FET of described N raceway groove (11) by Copper Foil, the resistive mixer unit of the passive field effect transistor FET of described N raceway groove (11) is connected to described BPF bandwidth-limited circuit unit (9) by Copper Foil, and be connected to described medium DR local oscillator unit (10) by the first electric capacity (C15), be connected to described intermediate frequency output amplifier unit (13) by the second electric capacity (C19) simultaneously, the resistive mixer unit of the passive field effect transistor FET of described N raceway groove (11) is connected to described intermediate frequency output amplifier unit (13) by Copper Foil.
4. according to claim 3 for receiving the tuner of satellite TV signal, it is characterized in that: the resistive mixer unit of the passive field effect transistor FET of wherein said N raceway groove (11) comprises the 4th resistance (R4) and N channel field-effect pipe FET pipe (Q4), described the 4th resistance (R4) one end ground connection, one end is connected to the grid junction of described BPF bandwidth-limited circuit unit (9) and described N channel field-effect pipe FET pipe (Q4) in addition, the grid of described N channel field-effect pipe FET pipe (Q4) is connected to described the 4th resistance (R4) and junction, described BPF bandwidth-limited circuit unit (9), the source ground of described N channel field-effect pipe FET pipe (Q4), the drain electrode of described N channel field-effect pipe FET pipe (Q4) is connected with described medium DR local oscillator unit (10), and be connected with described intermediate frequency output amplifier unit (13) by one group of printed inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210185686.7A CN102710912B (en) | 2012-06-06 | 2012-06-06 | Tuner for receiving satellite television signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210185686.7A CN102710912B (en) | 2012-06-06 | 2012-06-06 | Tuner for receiving satellite television signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102710912A CN102710912A (en) | 2012-10-03 |
| CN102710912B true CN102710912B (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210185686.7A Expired - Fee Related CN102710912B (en) | 2012-06-06 | 2012-06-06 | Tuner for receiving satellite television signal |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113612977A (en) * | 2021-08-09 | 2021-11-05 | 深圳市众异科技有限公司 | Filter structure and tuner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533936A (en) * | 2009-04-18 | 2009-09-16 | 李俊杰 | Radio frequency head |
| US20100130148A1 (en) * | 2008-11-27 | 2010-05-27 | Sony Corporation | Tuner module |
| CN202014326U (en) * | 2011-04-26 | 2011-10-19 | 宁波一凯电子有限公司 | Tuner |
-
2012
- 2012-06-06 CN CN201210185686.7A patent/CN102710912B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100130148A1 (en) * | 2008-11-27 | 2010-05-27 | Sony Corporation | Tuner module |
| CN101533936A (en) * | 2009-04-18 | 2009-09-16 | 李俊杰 | Radio frequency head |
| CN202014326U (en) * | 2011-04-26 | 2011-10-19 | 宁波一凯电子有限公司 | Tuner |
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| CN102710912A (en) | 2012-10-03 |
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Owner name: JIANGSU JINGUO ELECTRONICS CO., LTD. Free format text: FORMER OWNER: ZHANG JINGUO Effective date: 20130821 |
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