CN202334776U - Video optical receiver with matching impedance based on ground digital television single-frequency network - Google Patents
Video optical receiver with matching impedance based on ground digital television single-frequency network Download PDFInfo
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- CN202334776U CN202334776U CN2011204603620U CN201120460362U CN202334776U CN 202334776 U CN202334776 U CN 202334776U CN 2011204603620 U CN2011204603620 U CN 2011204603620U CN 201120460362 U CN201120460362 U CN 201120460362U CN 202334776 U CN202334776 U CN 202334776U
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Abstract
The utility model relates to a video optical receiver with matching impedance based on a ground digital television single-frequency network, which comprises a photoelectric converter. Signals of the photoelectric converter are converted into electric signals, the electric signals are input into an impedance amplifier to be amplified, the impedance amplifier is electrically connected with an impedance converter, the electric signals amplified by the impedance amplifier are input into the impedance converter for impedance conversion to produce electric signals with the impedance of 75 ohms, a current isolating capacitor is connected between the photoelectric conversion module and the impedance amplifier, and the output end of the photoelectric conversion module is connected with a grounding resistor. The optical receiver also comprises an automatic gain control circuit, the input end of the automatic gain control circuit is connected with the input end of the impedance amplifier, and the output end of the automatic gain control circuit is connected with a delay circuit and is then connected with the input end of the impedance converter. Since the delay gain control is adopted, the carrier-noise ratio of the video optical receiver is not affected, the signal distortion is reduced, and the scope of gain control is also broadened.
Description
Technical field
The utility model relates to a kind of optical receiver, is specifically related to a kind of video optical receiver that is used to receive picture signal.
Background technology
Optical receiver is the equipment of receiving optical signals (generally including photodetector, image intensifer, equalizer and signal processing); The main effect of optical receiver is with becoming the signal of telecommunication through the low light level conversion of signals of Optical Fiber Transmission, and the signal of amplification, the original emission of regeneration.
And the user who is connected to EPON (PON) must install video optical receiver, so that receive the wired broadcasting satellite broadcasting of sending through light signal.General video optical receiver comprises the photoelectric conversion module that is used for light signal is converted to the signal of telecommunication, after photoelectric conversion module converts the light signal that receives to the signal of telecommunication, re-sends in the amplifier (branch two-stage), so that be received.
But present optical receiver is not owing to be provided with delay circuit, and its gain control range is restricted., also be difficult to take into account the requirement of good and little two aspects of distortion of signal to noise ratio.
The utility model content
The utility model has overcome the deficiency of prior art, and the video optical receiver that a kind of gain controlling is wide and output signal carrier-to-noise ratio is good and distortion is little is provided, and has overcome the technical problem that exists in the prior art.
For solving above-mentioned technical problem, the utility model adopts following technical scheme:
A kind of band impedance matching video optical receiver based on ground digital television single frequency network; Comprise optical-electrical converter; Optical-electrical converter number converts the signal of telecommunication to, again the signal of telecommunication is input to impedance amplifier and amplifies, and impedance amplifier also is electrically connected with impedance transformer; The described signal of telecommunication is after impedance amplifier amplifies; Be input in the impedance transformer and carry out impedance conversion, generating impedance is 75 ohm the signal of telecommunication, and also is connected with stopping condenser between described photoelectric conversion module and the impedance amplifier; The output of photoelectric conversion module also is connected with earth resistance; Described video optical receiver also comprises automatic gain control circuit, and the input of automatic gain control circuit is connected with the input of impedance amplifier, and the output of automatic gain control circuit connects the input that connects impedance transformer behind the delay circuit again.
Technical scheme further is:
Described optical-electrical converter comprises semiconductor PIN photodiode or avalanche photodide.
Described delay circuit comprises a voltage stabilizing didoe and a resistance, and wherein the positive pole of voltage stabilizing didoe connects an end of resistance, resistance other end ground connection; The negative pole of voltage stabilizing didoe is an input, the just very output of voltage stabilizing didoe.
Described video optical receiver carries out impedance conversion with the ratio of 1:1.5 to corresponding electric signal.
Compared with prior art, the beneficial effect of the utility model is:
Owing to used the delay gain controlling, make the carrier-to-noise ratio of video optical receiver unaffected, signal distortion is littler, and gain control range was also wideer.
Description of drawings
Fig. 1 is the theory diagram of the utility model preferred embodiment;
Fig. 2 is the utility model delay circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiment of the utility model is done further to set forth.
As shown in Figure 1; A kind of band impedance matching video optical receiver based on ground digital television single frequency network comprises optical-electrical converter 1, and optical-electrical converter converts the signal of telecommunication to No. 1; Again the signal of telecommunication being input to impedance amplifier 2 amplifies; Impedance amplifier 2 also is electrically connected with impedance transformer 3, and the signal of telecommunication is input in the impedance transformer 3 and carries out impedance conversion after impedance amplifier 2 amplifies; To generate impedance is 75 ohm the signal of telecommunication; Also be connected with stopping condenser 5 between photoelectric conversion module 1 and the impedance amplifier 2, the output of photoelectric conversion module 1 also is connected with earth resistance 6, and above-mentioned video optical receiver also comprises automatic gain control circuit 7; And the input of automatic gain control circuit 7 is connected with the input of impedance amplifier 2, and the output of automatic gain control circuit 7 connects the input that connects impedance transformer 3 behind the delay circuit 8 again.And optical-electrical converter 1 can be selected to be made up of semiconductor PIN photodiode or avalanche photodide.Video optical receiver carries out impedance conversion with the ratio of 1:1.5 to corresponding electric signal.
As shown in Figure 2, the delay circuit in the utility model comprises a voltage stabilizing didoe and a resistance, and wherein the positive pole of voltage stabilizing didoe connects an end of resistance, resistance other end ground connection; The negative pole of voltage stabilizing didoe is an input, the just very output of voltage stabilizing didoe.
Come briefly to narrate the course of work of the utility model below again:
Optical-electrical converter 1 converts light signal to the signal of telecommunication, the signal of telecommunication is input in the impedance amplifier 2 amplifies again, carries out simultaneously postponing gain controlling by delay circuit 8 and gain controller 7, again signal is sent into impedance transformer 3 afterwards and handles.
Claims (4)
1. band impedance matching video optical receiver based on ground digital television single frequency network; Comprise optical-electrical converter (1); Optical-electrical converter (1) converts light signal to the signal of telecommunication; Again the signal of telecommunication being input to impedance amplifier (2) amplifies; Impedance amplifier (2) also is electrically connected with impedance transformer (3), it is characterized in that: the described signal of telecommunication is input in the impedance transformer (3) and carries out impedance conversion after impedance amplifier (2) amplifies; To generate impedance is 75 ohm the signal of telecommunication; And also be connected with stopping condenser (5) between described photoelectric conversion module (1) and the impedance amplifier (2), and the output of photoelectric conversion module (1) also is connected with earth resistance (6), and described video optical receiver also comprises automatic gain control circuit (7); And the input of automatic gain control circuit (7) is connected with the input of impedance amplifier (2), and the output of automatic gain control circuit (7) connects the input that connects impedance transformer (3) behind the delay circuit (8) again.
2. the band impedance matching video optical receiver based on ground digital television single frequency network according to claim 1, it is characterized in that: described optical-electrical converter (1) comprises semiconductor PIN photodiode or avalanche photodide.
3. the band impedance matching video optical receiver based on ground digital television single frequency network according to claim 1; It is characterized in that: described delay circuit comprises a voltage stabilizing didoe and a resistance; Wherein the positive pole of voltage stabilizing didoe connects an end of resistance, resistance other end ground connection; The negative pole of voltage stabilizing didoe is an input, the just very output of voltage stabilizing didoe.
4. the band impedance matching video optical receiver based on ground digital television single frequency network according to claim 1, it is characterized in that: described video optical receiver carries out impedance conversion with the ratio of 1:1.5 to corresponding electric signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204603620U CN202334776U (en) | 2011-11-18 | 2011-11-18 | Video optical receiver with matching impedance based on ground digital television single-frequency network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204603620U CN202334776U (en) | 2011-11-18 | 2011-11-18 | Video optical receiver with matching impedance based on ground digital television single-frequency network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202334776U true CN202334776U (en) | 2012-07-11 |
Family
ID=46446738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204603620U Expired - Fee Related CN202334776U (en) | 2011-11-18 | 2011-11-18 | Video optical receiver with matching impedance based on ground digital television single-frequency network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202334776U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342819A (en) * | 2016-05-03 | 2017-11-10 | 珠海天启技术有限公司 | Optical receiver and preparation method thereof, interior match circuit |
-
2011
- 2011-11-18 CN CN2011204603620U patent/CN202334776U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342819A (en) * | 2016-05-03 | 2017-11-10 | 珠海天启技术有限公司 | Optical receiver and preparation method thereof, interior match circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20181118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |