CN201733383U - Wired-television automatic light-gain control circuit unit - Google Patents
Wired-television automatic light-gain control circuit unit Download PDFInfo
- Publication number
- CN201733383U CN201733383U CN2009200349214U CN200920034921U CN201733383U CN 201733383 U CN201733383 U CN 201733383U CN 2009200349214 U CN2009200349214 U CN 2009200349214U CN 200920034921 U CN200920034921 U CN 200920034921U CN 201733383 U CN201733383 U CN 201733383U
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- China
- Prior art keywords
- signal
- amplifier
- catv
- operational amplifier
- controlled attenuator
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- Expired - Fee Related
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- Control Of Amplification And Gain Control (AREA)
- Optical Communication System (AREA)
Abstract
The utility model relates to a wired-television automatic light-gain control circuit unit, which comprises a photoelectric converter, a low-noise amplifier, an electrically-controlled attenuator, a power amplifier, an operational amplifier and a singlechip microprocessor; an optical signal is converted into an electrical signal and then divided into two paths through photoelectric conversion, wherein one path is a community antenna television (CATV) broadband signal connected with the low-noise amplifier; the other path is a direct-current voltage connected with the operational amplifier; the operational amplifier is used for computing, amplifying and sending the weak direct-current electrical signal converted by the photoelectric converter into the singlechip microprocessor; the singlechip microprocessor is used for judging, computing, processing and then sending the signal sent by the operational amplifier into the electrically-controlled attenuator; the low-noise amplifier is used for amplifying the CATV broadband signal sent by the photoelectric converter and sending the CATV broadband signal into the electrically-controlled attenuator; and the electrically-controlled attenuator is used for controlling the CATV broadband signal received from the low-noise amplifier according to a control signal received from the singlechip microprocessor and sending the CATV broadband signal into the power amplifier after being processed. The utility model can ensure the output level of an optical receiver and save the cost of an automatic gain control (AGC) circuit.
Description
Technical field
The utility model relates to the optical pickup apparatus of cable TV.
Background technology
In traditional HFC equipment, radio frequency AGC (" AGC " is the abbreviation of automatic gain control) is arranged.Radio frequency AGC exist control range little (± 3=＞± 0.5dB), shortcoming such as circuit complexity.
The utility model content
The purpose of this utility model is, overcomes the deficiency that traditional cable TV auto-gain circuit exists, and provides a kind of and can guarantee the output level of optical receiver, the cable TV optical receiver of saving agc circuit cost.
The utility model is achieved in that
The light agc circuit is applied in the cable TV optical receiver, its objective is in order to guarantee the output level of optical receiver, when input power changes (example :-7dBm～+ 2dBm) its value keep constant substantially (≤± 1dB), promptly ± 20=＞± 1dB.Need not use pilot signal, save the cost of agc circuit widely.
Concrete technical scheme of the present utility model is: be made up of optical-electrical converter 1, low noise amplifier 4, voltage-controlled attenuator 5, power amplifier 6, operational amplifier 2, singlechip microprocessor 3; Opto-electronic conversion is divided two-way after converting light signal to the signal of telecommunication, and one the tunnel is the CATV broadband signal, links to each other with low noise amplifier 4; Another road is that direct voltage is connected with operational amplifier 2;
Operational amplifier, the faint dc signal of optical-electrical converter 1 conversion calculated and amplify after send into singlechip microprocessor 3;
Chip microprocessor is sent into voltage-controlled attenuator 5 after the signal that operational amplifier 2 is sent into judged, calculates, handles;
Low noise amplifier (4) is sent into optical-electrical converter (1) broadband signal of CATV and is amplified, and sends into voltage-controlled attenuator (5); Voltage-controlled attenuator (5) is controlled the CATV broadband signal that receives from low noise amplifier (4) according to the control signal that receives from chip microprocessor (3), sends into power amplifier (6) after the processing.
When installing and using, the utility model is connected in the optical receiving device, this circuit unit is the modular connected structure, and inserting mode is that pin hole connects.
The utility model device can guarantee output level, the saving agc circuit cost of optical receiver.
Description of drawings
Fig. 1. be the circuit structure block diagram of the utility model embodiment
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the optical pickup apparatus of the cable TV of narration utility model.
As shown in Figure 1, present embodiment mainly is made up of optical-electrical converter 1, low noise amplifier 4, voltage-controlled attenuator 5, power amplifier 6, operational amplifier 2, chip microprocessor 3.The situation that its circuit structure and information transmit is as follows:
1, optical-electrical converter 1 divides two-way after converting light signal to the signal of telecommunication, and one the tunnel is the CATV broadband signal, links to each other with low noise amplifier 4; Another road is a direct voltage, is connected with operational amplifier 2.
2, operational amplifier 2, the dc signal of optical-electrical converter 1 conversion calculated and amplify after send into chip microprocessor 3.
3, chip microprocessor 3 is sent into voltage-controlled attenuator 5 after the signal that operational amplifier 2 is sent into judged, calculates, handles.
4, low noise amplifier 4, the broadband signal that optical-electrical converter 1 is sent into enters amplification, its objective is the loss that remedies optical-electrical converter 5 and reaches the requirement of power amplifier 6.
5, voltage-controlled attenuator 5, this circuit adopts high accuracy, great dynamic range, the programmable digital radio frequency attenuator is controlled the CATV broadband signal, and the output level of guaranteed output amplifier 6 reaches default stationary value.
6, power amplifier 6 carries out power amplification with the CATV broadband signal, reaches the CATV specification requirement.
Claims (2)
1. cable TV light automatic gain control circuit unit is characterized in that: be made up of optical-electrical converter (1), low noise amplifier (4), voltage-controlled attenuator (5), power amplifier (6), operational amplifier (2), singlechip microprocessor (3); Opto-electronic conversion is divided two-way after converting light signal to the signal of telecommunication, and one the tunnel is the CATV broadband signal, links to each other with low noise amplifier (4); Another road is that direct voltage is connected with operational amplifier (2);
Operational amplifier, the faint dc signal of optical-electrical converter (1) conversion calculated and amplify after send into singlechip microprocessor (3);
Chip microprocessor is sent into voltage-controlled attenuator (5) after the signal that operational amplifier (2) is sent into is judged, calculates, handled;
Low noise amplifier (4) amplifies the CATV broadband signal that optical-electrical converter (1) is sent into, and sends into voltage-controlled attenuator (5); Voltage-controlled attenuator (5) is controlled the CATV broadband signal that receives from low noise amplifier (4) according to the control signal that receives from chip microprocessor (3), sends into power amplifier (6) after the processing.
2. according to the described smooth automatic gain control circuit of claim 1 unit, it is characterized in that: voltage-controlled attenuator (5), adopt the programmable digital radio frequency attenuator that the CATV signal is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200349214U CN201733383U (en) | 2009-10-10 | 2009-10-10 | Wired-television automatic light-gain control circuit unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200349214U CN201733383U (en) | 2009-10-10 | 2009-10-10 | Wired-television automatic light-gain control circuit unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733383U true CN201733383U (en) | 2011-02-02 |
Family
ID=43524537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200349214U Expired - Fee Related CN201733383U (en) | 2009-10-10 | 2009-10-10 | Wired-television automatic light-gain control circuit unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201733383U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102387355A (en) * | 2011-10-26 | 2012-03-21 | 常熟市高事达光电科技有限公司 | Single chip controlled optical automatic gain control circuit of cable TV (television) network optical receiver |
| CN103457560A (en) * | 2013-09-12 | 2013-12-18 | 陕西迈克高新科技实业集团有限公司 | Optical automatic gain control circuit |
-
2009
- 2009-10-10 CN CN2009200349214U patent/CN201733383U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102387355A (en) * | 2011-10-26 | 2012-03-21 | 常熟市高事达光电科技有限公司 | Single chip controlled optical automatic gain control circuit of cable TV (television) network optical receiver |
| CN103457560A (en) * | 2013-09-12 | 2013-12-18 | 陕西迈克高新科技实业集团有限公司 | Optical automatic gain control circuit |
| CN103457560B (en) * | 2013-09-12 | 2016-09-28 | 陕西迈克高新科技实业集团有限公司 | Light automatic gain control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110202 Termination date: 20131010 |