CN203279020U - C-waveband high frequency head - Google Patents
C-waveband high frequency head Download PDFInfo
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- CN203279020U CN203279020U CN 201320228274 CN201320228274U CN203279020U CN 203279020 U CN203279020 U CN 203279020U CN 201320228274 CN201320228274 CN 201320228274 CN 201320228274 U CN201320228274 U CN 201320228274U CN 203279020 U CN203279020 U CN 203279020U
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Abstract
The utility model discloses a C-waveband high frequency head. The high frequency head comprises a feed source, a circuit board box with a circuit board inside, a joint arranged on the circuit board box, and a wave guide tube for signal transmission and connected between the feed source and the circuit board box, wherein the circuit board is provided with an RDA3570 control chip and a high frequency amplification module, a medium frequency output module, a voltage stabilization module and a crystal oscillator phase-locked module which are respectively connected with the control chip. The high frequency head has the following beneficial effects that the frequency and phase of the output signal in the control module are automatically adjusted and locked without manual adjustment process, the use difficulty is effectively reduced, and usage is facilitated; the crystal oscillator phase-locked module with good stability is less affected by the temperature in the general environment, and the quality of the output signal is effectively ensured.
Description
Technical field
The utility model relates to a kind of satellite signal receiving apparatus, refers more particularly to a kind of C-band tuner.
Background technology
The effect of C-band tuner is to receive satellite TV signal, is used for channel selection, signal frequency conversion processing, and the TV signal of final stable output.it is that the output signal of C-band tuner will be synchronizeed with reference-input signal and be consistent on frequency and phase place that one important step is arranged in the above-mentioned course of work, just can obtain stable television image by this link, in the prior art the solution of this link normally the control control chip of circuit board and and triode with jointly completing in the molecular frequency of oscillation circuit of resonance, its operation principle is: in use, need first to be located at set screw on the C-band tuner to adjust contact in the frequency of oscillation circuit and the spacing between harmonic oscillator by rotation, thereby change the local frequency that the frequency of oscillation circuit produces, then control by controlling control chip frequency and the phase place that this local frequency goes to transfer output signal, until output signal is synchronizeed with reference-input signal on frequency and phase place and is consistent, last again by in the mode of set screw place cementing, set screw being fixed, thereby reach, output signal is advanced line-locked purpose.But the local frequency that produces due to the frequency of oscillation circuit is higher, generally all more than 20MHz, thereby makes in adjustment process, and between contact and harmonic oscillator, the minor variations of spacing all will cause this local frequency significantly to change.Therefore, the difficulty of regulating the local frequency that the frequency of oscillation circuit produces by the rotation set screw is very large, and the user need to debug the adjusting work that repeatedly just can complete this local frequency usually, thereby has increased the use difficulty of C-band tuner.In addition, the variation of ambient temperature also can make each parts of C-band tuner expand with heat and contract with cold, thereby the contact and the spacing between harmonic oscillator that very easily cause regulating after completing change and change the local frequency that the frequency of oscillation circuit produces, make it produce frequency drift, and then make output signal to synchronize with reference-input signal and to be consistent, finally affect the quality of output signal.
The utility model content
The purpose of this utility model is to solve the adjusting difficulty problem large with easily affected by environment of output signal.
The technical solution of the utility model is such:
A kind of C-band tuner, comprise feed, waveguide pipe, circuit board box, circuit board and joint, described waveguide pipe is connected between described feed and described circuit board box, described circuit board is arranged in described circuit board box, described joint is located on circuit board box, and described circuit board is provided with RDA3570 control chip and the connected high frequency amplifying module of difference, intermediate frequency output module, Voltage stabilizing module and the phase-locked module of crystal oscillator;
Wherein, the phase-locked module of described crystal oscillator comprises crystal oscillator, the tenth capacitor C 10 and the 11 capacitor C 11, described crystal oscillator is connected between the xtal1 pin and xtal2 pin of described control chip, one end of described the tenth capacitor C 10 is connected to an end of described crystal oscillator, one end of described the 11 capacitor C 11 is connected to the other end of described crystal oscillator, the equal ground connection of the other end of described the tenth capacitor C 10 and described the 11 capacitor C 11;
the satellite-signal that described high frequency amplifying module receives is exported by described intermediate frequency output module after described control chip is processed, wherein, described control chip is converted to output signal with described satellite-signal, and in frequency and the phase place difference between itself and reference-input signal and produce by the phase-locked module of described control crystal oscillator the local frequency that is complementary described output signal is adjusted relatively before the output of this output signal, until after the frequency of described output signal and phase place synchronize with described reference-input signal and be consistent, again described output signal transferred to described intermediate frequency output module and exported by described intermediate frequency output module.
The beneficial effects of the utility model: 1. the utility model changes local frequency that the crystal oscillator in the phase-locked module of crystal oscillator produces automatically to complete adjusting and the locking work to its output signal frequency and phase place by the RDA3570 control chip, owing to need not manual adjustments, thereby effectively reduce the use difficulty, convenient for users; 2. the phase-locked module of described crystal oscillator is subjected to the impact of temperature little in general environment, and good stability can effectively guarantee the quality of output signal.
Description of drawings
Fig. 1 is the utility model structure chart in one embodiment;
Fig. 2 is the utility model schematic block circuit diagram of circuit board in one embodiment;
Fig. 3 is the utility model circuit connection diagram of circuit board in one embodiment.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, 2, a kind of C-band tuner, comprise feed 1, internal circuit board (not shown) circuit board box 2, be arranged on the joint 3 on circuit board box 2, and be connected between described feed 1 and described circuit board box 2 waveguide pipe 4 that is used for transmission of signal; Described circuit board is provided with RDA3570 control chip 5, the high frequency amplifying module 6 that is connected with described control chip 5 respectively, intermediate frequency output module 8, and Voltage stabilizing module 9, also be provided with the phase-locked module 10 of crystal oscillator on described circuit board, the phase-locked module 10 of described crystal oscillator is connected with described control chip 5.
Physical circuit is connected to:
Described Voltage stabilizing module 9 comprises three-terminal voltage-stabilizing pipe, the 13 capacitor C 13 and the 14 capacitor C 14, and the model that described three-terminal voltage-stabilizing pipe adopts is 78M06, and first end a is that Vin pin, the second end b are the Vout pin, and the 3rd end c is earth terminal; Described Vin pin also connects with an end of the 11 resistance R 11, the other end of described the 11 resistance R 11 is connected to two branch roads, wherein a branch road is string the 12 rear ground connection of resistance R 12, and another branch road is after string the tenth resistance R 10 and is connected the polar pin connection of control chip; Described the 14 rear ground connection of capacitor C 14 of described Vout pin string, described Vout pin also respectively be connected the vbat1 pin of control chip and be connected with the vbat pin.This is provided for pressure regulation, and makes direct current more level and smooth, and the control chip operation is more stable.
Described high frequency amplifying module 6 comprises the first field-effect transistor Q1, the second field-effect transistor Q2 and the 3rd field-effect transistor Q3, wherein, the grid G 1 of described the first field-effect transistor Q1 connects one tunnel radiofrequency signal by described waveguide pipe 4, connect the grid G 3 of the 3rd field-effect transistor Q3 after source S 1 string the 6th capacitor C 6 of described the first field-effect transistor Q1, drain D 1 ground connection of described the first field-effect transistor Q1; The grid G 2 of described the second field-effect transistor Q2 connects another road radiofrequency signal by described waveguide pipe 4, connect the grid G 3 of described the 3rd field-effect transistor Q3 after source S 2 string the 5th capacitor C 5 of described the second field-effect transistor Q2, drain D 2 ground connection of described the second field-effect transistor Q2; The source S 3 of described the 3rd field-effect transistor Q3 be connected the RFIN pin of control chip and connect, its drain D 3 ground connection.Certainly, also can adopt other substituting circuit that the High frequency amplification function is arranged.
The phase-locked module 10 of described crystal oscillator comprises crystal oscillator, the tenth capacitor C 10 and the 11 capacitor C 11, described crystal oscillator is connected between the xtal1 pin and xtal2 pin of described control chip, one end of described the tenth capacitor C 10 is connected to an end of described crystal oscillator, one end of described the 11 capacitor C 11 is connected to the other end of described crystal oscillator, the equal ground connection of the other end of described the tenth capacitor C 10 and described the 11 capacitor C 11.When specific design, can do on the basis of the above further optimization, as described in the end of crystal oscillator XAL add the given electric capacity quantity of physical circuit parameter with the skew that reduces frequency or unstable.
Described intermediate frequency output module 8 comprises the 12 electric capacity R12, the IFout pin of the described control chip of termination of described the 12 electric capacity R12, its other end be connected joint and connect.This stage be with the HFS filtering of the output signal of pin IFout pin to restore the intermediate-freuqncy signal in described output signal, be used for the broadcast of video, television image.
Optimize, also comprise filtration module 7 on described circuit board, described filtration module one end is connected with the source S 3 of described the 3rd field effect transistor Q3, its other end by the 9th capacitor C 9 be connected the RFIN pin connection of control chip, with the elimination clutter.
The below describes the connection status of other pins of described control chip in detail: the hv_sel pin is by the 7th resistance R 7 ground connection; After vg_h pin string the first resistance R 1 and be connected grid G 1 connection of the first field-effect transistor Q1; After vd_h pin string the second resistance R 2 and be connected source S 1 connection of the first field-effect transistor Q1; After described vg_st2 pin string the 5th resistance R 5 and be connected grid G 3 connections of the 3rd field-effect transistor Q3; After vd_st2 pin string the 6th resistance R 6 and be connected source S 3 connections of the 3rd field-effect transistor Q3; After described vg_v pin string the 3rd resistance R 3 and be connected grid G 2 connections of the second field-effect transistor Q2; After vd_v pin string the 4th resistance R 4 and be connected source S 2 connections of the second field-effect transistor Q2; Rcal pin string the 9th rear ground connection of resistance R 9; LOsel pin string the 8th rear ground connection of resistance R 8.Need to prove, in the present embodiment, the pin of NM described control chip is all done grounding.
Be further optimized circuit performance, for eliminating unnecessary interference signal or high frequency clutter, a plurality of Nodes that connect at circuit are provided with ground capacity as the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 7th capacitor C 7, the 8th capacitor C 8, the 14 capacitor C 14 etc., do not do elaboration at this.
Operation principle is as follows:
described feed 1 transfers to described high frequency amplifying module 6 by described waveguide pipe 4 after receiving satellite-signal, described high frequency amplifying module 6 is done described signal to amplify and is processed and transfer to control chip 5 after described filtration module 7 filtering clutters, described control chip 5 will receive the signal that comes from described filtration module 7 and process, generating output signal after processing, then the frequency between more described output signal and reference-input signal and phase place difference and produce by the phase-locked module of described control crystal oscillator 10 local frequency that is complementary described output signal is adjusted, until after the frequency of described output signal and phase place synchronize with described reference-input signal and be consistent, again described output signal is transferred to described intermediate frequency output module 9, described intermediate frequency output module 9 restores intermediate-freuqncy signal from the described output signal that comes from described control chip 5, and the described intermediate-freuqncy signal that will restore transfers in TV for playing by described joint 3.
Above-described the utility model execution mode does not consist of the restriction to the utility model protection range.Any modification of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in claim protection range of the present utility model.
Claims (5)
1. C-band tuner, it is characterized in that, comprise feed, waveguide pipe, circuit board box, circuit board and joint, described waveguide pipe is connected between described feed and described circuit board box, described circuit board is arranged in described circuit board box, described joint is located on circuit board box, and described circuit board is provided with RDA3570 control chip and the connected high frequency amplifying module of difference, intermediate frequency output module, Voltage stabilizing module and the phase-locked module of crystal oscillator;
Wherein, the phase-locked module of described crystal oscillator comprises crystal oscillator, the tenth electric capacity (C10) and the 11 electric capacity (C11), described crystal oscillator is connected between the xtal1 pin and xtal2 pin of described control chip, one end of described the tenth electric capacity (C10) is connected to an end of described crystal oscillator, one end of described the 11 electric capacity (C11) is connected to the other end of described crystal oscillator, the equal ground connection of the other end of described the tenth electric capacity (C10) and described the 11 electric capacity (C11);
the satellite-signal that described high frequency amplifying module receives is exported by described intermediate frequency output module after described control chip is processed, wherein, described control chip is converted to output signal with described satellite-signal, and in frequency and the phase place difference between itself and reference-input signal and produce by the phase-locked module of described control crystal oscillator the local frequency that is complementary described output signal is adjusted relatively before the output of this output signal, until after the frequency of described output signal and phase place synchronize with described reference-input signal and be consistent, again described output signal transferred to described intermediate frequency output module and exported by described intermediate frequency output module.
2. C-band tuner according to claim 1, it is characterized in that, described high frequency amplifying module comprises the first field-effect transistor (Q1), the second field-effect transistor (Q2) and the 3rd field-effect transistor (Q3), the grid G 1 of described the first field-effect transistor (Q1) connects one tunnel radiofrequency signal by described waveguide pipe, connect the grid G 3 of the 3rd field-effect transistor (Q3) after source S 1 string the 6th electric capacity (C6) of described the first field-effect transistor (Q1), drain D 1 ground connection of described the first field-effect transistor (Q1); The grid G 2 of described the second field-effect transistor (Q2) connects another road radiofrequency signal by described waveguide pipe, connect the grid G 3 of the 3rd field-effect transistor (Q3) after source S 2 string the 5th electric capacity (C5) of described the second field-effect transistor (Q2), drain D 2 ground connection of described the second field-effect transistor (Q2); The source S 3 of described the 3rd field-effect transistor (Q3) be connected control chip RFIN pin and connect, its drain D 3 ground connection.
3. C-band tuner according to claim 1, is characterized in that, described intermediate frequency output module comprises the 12 electric capacity (R12), the IFout pin of a described control chip of termination of described the 12 electric capacity (R12), its other end be connected joint and connect.
4. C-band tuner according to claim 1, it is characterized in that, also be provided with filtration module on described circuit board, described filtration module one end is connected with described high frequency amplifying module, and its other end is by the 9th electric capacity (C9) and the RFIN pin connection of control chip of being connected.
5. C-band tuner according to claim 1, it is characterized in that, described Voltage stabilizing module comprises three-terminal voltage-stabilizing pipe, the 13 electric capacity (C13) and the 14 electric capacity (C14), ground connection after described three-terminal voltage-stabilizing pipe first end (a) described the 13 electric capacity of string (C13), ground connection after its second end (b) described the 14 electric capacity of string (C14), its 3rd end (c) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320228274 CN203279020U (en) | 2013-04-28 | 2013-04-28 | C-waveband high frequency head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320228274 CN203279020U (en) | 2013-04-28 | 2013-04-28 | C-waveband high frequency head |
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| Publication Number | Publication Date |
|---|---|
| CN203279020U true CN203279020U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320228274 Expired - Fee Related CN203279020U (en) | 2013-04-28 | 2013-04-28 | C-waveband high frequency head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492883A (en) * | 2019-08-30 | 2019-11-22 | 珠海市普斯赛特科技有限公司 | A kind of method and circuit of the anti-tampering type frequency reducing of C-band phaselocked loop |
-
2013
- 2013-04-28 CN CN 201320228274 patent/CN203279020U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492883A (en) * | 2019-08-30 | 2019-11-22 | 珠海市普斯赛特科技有限公司 | A kind of method and circuit of the anti-tampering type frequency reducing of C-band phaselocked loop |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20140428 |