CN2891542Y - Automatic gain control circuit structure in optical transmission platform - Google Patents
Automatic gain control circuit structure in optical transmission platform Download PDFInfo
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- CN2891542Y CN2891542Y CN 200620072694 CN200620072694U CN2891542Y CN 2891542 Y CN2891542 Y CN 2891542Y CN 200620072694 CN200620072694 CN 200620072694 CN 200620072694 U CN200620072694 U CN 200620072694U CN 2891542 Y CN2891542 Y CN 2891542Y
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- resistance
- compensator
- thermo
- detector diode
- filter capacitor
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Abstract
The utility model relates to an automatic gain control circuit construction of an optical transmission platform which in the component electronic circuitry technology field. The utility model comprises a circuit connected by an input capacitor, a high frequency detector diode, a biasing resistance, a transmittal input resistance, a choke coil, a temperature compensating resistance, a voltage grading resistance, a transmittal circuit, a integral resistance, a filter capacitor, a integral capacitor, a detector diode. The utility model is simply, compactly and reasonably structured. The employed high frequency detector diode demodulates the incoming wideband radio-frequency signal, the signal to the transmittal circuit are differentially input, and the drift of detector device are compensated, and further detectors the peak value of the transmittal circuit is put into practice for the stable working performance of the automatic gain control circuit in the forward emission module unit of multi-service wideband transmission platform. Thereby, the controlled resolution and temperature stability of the module unit's radio-frequency gross power and the distortion indicator of complete appliance are better than the similar products.
Description
Technical field
The utility model relates to the automatic gain control circuit structure in a kind of optical transport platform, specifically in the optical transmitter circuit of utilization and cable television system, can control a kind of circuit of the level of drive automatically, belongs to components and parts electronic circuit technology field.
Background technology
At present, in the production of cable television appliances, automatic gain control circuit is used at the forward laser transmitter.Because the rf excitation signal that the automatic gain control circuit structure produces is very big to the operating state influence of laser, the bad radio circuit of performance can produce the additional signals distortion, and then combination three jumps of complete machine is clapped important indicator such as compare than, combination second order beat and exert an influence.Before the utility model is made, in prior art, the automatic gain control circuit of multi-service wideband transmit platform, relatively poor on the distortion index of the control precision of radio frequency gross power and temperature stability, complete machine, make the optical link performance of complete machine stable inadequately.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, thereby a kind of broadband rf signal detection of adopting the high frequency detector diode to input is provided, and difference is input to discharge circuit, the temperature of detection device is floated compensate; Again peak detection is carried out in the output of discharge circuit, made the forward direction transmission modular unit of multi-service wideband transmit platform more stable on service behaviour, technical indicator is also more excellent; Thereby make unit module on the distortion index of the control precision of radio frequency gross power and temperature stability, complete machine, all get well automatic gain control circuit structure in the optical transport platform with like product.
Main solution of the present utility model is achieved in that
The utility model mainly adopts input capacitance C10 to be connected with the negative terminal of detection tube D5, and high frequency detector diode D5 forward end is connected with amplifier input resistance R9, biasing resistor R8 one end; The amplifier input resistance R9 other end is connected with integrating capacitor C17, discharge circuit IC4 backward end and integrating resistor R10 one end respectively; Form bias circuit by biasing resistor R28, R8, R7; Biasing resistor R28 one end connects filter capacitor C16; The biasing resistor R28 other end connects voltage end; The integrating capacitor C17 and the integrating resistor R10 other end are connected with detector diode D8 forward end respectively with after the output of discharge circuit IC4 links to each other again; Biasing resistor R8 one end is connected with biasing resistor R7 one end and filter capacitor C11 respectively; The biasing resistor R8 other end is connected with thermo-compensator R19, divider resistance R20, amplifier input resistance R18 one end respectively, and amplifier input resistance R18 is connected with discharge circuit IC4 forward end; The divider resistance R20 other end is connected with divider resistance R17, and by amplifier input resistance R18, the two-way input signal is connected respectively to the positive and negative terminal of discharge circuit IC4 after divider resistance R17 and the divider resistance R20 dividing potential drop; The thermo-compensator R19 other end is connected with thermo-compensator R15, R13, filter capacitor C12, choke L4 respectively; Choke L4 is connected with detection tube D5 backward end, input capacitance C10 respectively; The thermo-compensator R15 other end connects thermo-compensator R12; Filter capacitor C12 is connected with high frequency detector diode D6 backward end and resistance R 16 1 ends respectively; Resistance R 16 other ends are connected divider resistance R17 jointly with high frequency detector diode D6 forward end; Filter capacitor C12 is connected with filter capacitor C13, thermo-compensator R14, resistance R 11 1 ends respectively, filter capacitor C13 and ground connection; The thermo-compensator R14 other end is connected with thermo-compensator R13 one end, and the thermo-compensator R13 other end is connected with resistance R 11.
Compared with the prior art the utility model has the following advantages:
The utility model is simple, compact and reasonable for structure; Because adopt the broadband rf signal detection of high frequency detector diode to input, difference is input to discharge circuit, the temperature of detection device is floated compensate; Again peak detection is carried out in the output of discharge circuit, made the automatic gain control circuit service behaviour of forward direction transmission modular unit of multi-service wideband transmit platform stable more, technical indicator is also more excellent; Thereby modular unit is all got well and like product on the distortion index of the control precision of radio frequency gross power and temperature stability, complete machine.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:
The utility model mainly is made up of input capacitance C10, high frequency detector diode D5, D6, biasing resistor R28, R7, R8, amplifier input resistance R9, choke L4, thermo-compensator R19, R11, R12, R13, R14, thermo-compensator R15, divider resistance R17, R20, amplifier input resistance R18, discharge circuit IC4, integrating resistor R10, filter capacitor C11, C12, C13, C16 integrating capacitor C17, detector diode D8, resistance R 16 etc.
As shown in drawings: input capacitance C10 is connected with the negative terminal of detection tube D5, and high frequency detector diode D5 (HSMS-2810) anode is connected with amplifier input resistance R9, biasing resistor R8 one end; The amplifier input resistance R9 other end is connected with integrating capacitor C17, discharge circuit IC4 negative terminal and integrating resistor R10 one end respectively, (integrating resistor R10 and integrating capacitor C17 also are connected in the backward end of discharge circuit IC4 and output is formed the reverse integral circuit, and the output of discharge circuit IC4 is connected to the forward end of detector diode D8 (2AP30E)).Form bias circuit by biasing resistor R28, R8, R7, biasing resistor R28 one end connects filter capacitor C16, filter capacitor C16 and ground connection; The biasing resistor R28 other end connects voltage end (24V); The integrating capacitor C17 and the integrating resistor R10 other end are connected with detector diode D8 forward end respectively with after the output of discharge circuit IC4 links to each other again; Biasing resistor R8 one end is connected with biasing resistor R7 one end and filter capacitor C11 respectively, biasing resistor R7 other end ground connection; The biasing resistor R8 other end links to each other with thermo-compensator R19, divider resistance R20 respectively, and amplifier input resistance R18 is connected with discharge circuit IC4 anode; The divider resistance R20 other end is connected with divider resistance R17, divider resistance R17 and ground connection, and by amplifier input resistance R18, the two-way input signal is connected respectively to the positive and negative terminal of discharge circuit IC4 after divider resistance R17 and the divider resistance R20 dividing potential drop; The thermo-compensator R19 other end is connected with thermo-compensator R15, R13, filter capacitor C12, choke L4 respectively; Choke L4 is connected with detection tube D5 backward end, input capacitance C10 respectively; The thermo-compensator R15 other end connects thermo-compensator R12, the thermo-compensator R12 other end and ground connection; Filter capacitor C12 is connected with high frequency detector diode D6 (HSMS-2810) backward end and resistance R 16 1 ends respectively; Resistance R 16 other ends are connected divider resistance R17 jointly with high frequency detector diode D6 forward end; Filter capacitor C12 is connected with filter capacitor C13, thermo-compensator R14, resistance R 11 1 ends respectively, filter capacitor C13 and ground connection; The thermo-compensator R14 other end is connected with thermo-compensator R13 one end, and the thermo-compensator R13 other end is connected with resistance R 11.
Operation principle of the present utility model:
The forward of the utility model discharge circuit IC4 and reverse input end all adopt high frequency detector diode D5, D6, and high frequency detector diode D5 is as the reverse wave detector of radiofrequency signal, and the DC level that detects adds amplifier.And high frequency detector diode D6 adds bias voltage another input of amplifier as temperature-compensation circuit.The principle of this circuit is when variations in temperature, and the temperature influence occurrence features skew simultaneously of two detector diodes of amplifier input overcomes the temperature drift of detection tube by the difference input of amplifier.Detector diode D8 (2AP30E) is as peak detector, and to the vision signal detection once more of amplifier output, the control level that can avoid automatic gain control circuit to export is like this beated and caused the shake of the whole level of drive.
Claims (1)
1, the automatic gain control circuit structure in a kind of optical transport platform, it is characterized in that adopting input capacitance (C10) to be connected with the negative terminal of detection tube (D5), high frequency detector diode (D5) forward end is connected with amplifier input resistance (R9), biasing resistor (R8) end; Amplifier input resistance (R9) other end is connected with integrating capacitor (C17), discharge circuit (IC4) backward end and integrating resistor (R10) end respectively; (R28, R8, R7) forms bias circuit by biasing resistor, and biasing resistor (R28) end connects filter capacitor (C16), and the other end connects voltage end; The integrating capacitor (C17) and integrating resistor (R10) other end are connected with detector diode (D8) forward end respectively with after the output of discharge circuit (IC4) links to each other again; Biasing resistor (R8) end is connected with biasing resistor (R7) end and filter capacitor (C11) respectively; Biasing resistor (R8) other end is connected with thermo-compensator (R19), divider resistance (R20), amplifier input resistance (R18) end respectively, and amplifier input resistance (R18) is connected with discharge circuit (IC4) forward end; Divider resistance (R20) other end is connected with divider resistance (R17), and by amplifier input resistance (R18), the two-way input signal is connected respectively to the positive and negative terminal of discharge circuit (IC4) after divider resistance (R17) and divider resistance (R20) dividing potential drop; Thermo-compensator (R19) other end is connected with thermo-compensator (R15, R13), filter capacitor (C12), choke (L4) respectively; Choke (L4) is connected with detection tube (D5) backward end, input capacitance (C10) respectively; Thermo-compensator (R15) other end connects thermo-compensator (R12); Filter capacitor (C12) is connected with high frequency detector diode (D6) backward end and resistance (R16) end respectively; Resistance (R16) other end is connected divider resistance (R17) jointly with high frequency detector diode (D6) forward end; Filter capacitor (C12) is connected with filter capacitor (C13), thermo-compensator (R14), resistance (R11) end respectively; Thermo-compensator (R14) other end is connected with thermo-compensator (R13) end, and thermo-compensator (R13) other end is connected with resistance (R11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620072694 CN2891542Y (en) | 2006-04-18 | 2006-04-18 | Automatic gain control circuit structure in optical transmission platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620072694 CN2891542Y (en) | 2006-04-18 | 2006-04-18 | Automatic gain control circuit structure in optical transmission platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2891542Y true CN2891542Y (en) | 2007-04-18 |
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ID=38022201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620072694 Expired - Fee Related CN2891542Y (en) | 2006-04-18 | 2006-04-18 | Automatic gain control circuit structure in optical transmission platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2891542Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101373958B (en) * | 2007-08-23 | 2010-09-01 | 锐迪科微电子（上海）有限公司 | Automatic gain control circuit and receiver using the same |
| CN115824274A (en) * | 2021-12-01 | 2023-03-21 | 深圳市速腾聚创科技有限公司 | Photodetection circuit and optoelectronic system |
-
2006
- 2006-04-18 CN CN 200620072694 patent/CN2891542Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101373958B (en) * | 2007-08-23 | 2010-09-01 | 锐迪科微电子（上海）有限公司 | Automatic gain control circuit and receiver using the same |
| CN115824274A (en) * | 2021-12-01 | 2023-03-21 | 深圳市速腾聚创科技有限公司 | Photodetection circuit and optoelectronic system |
| CN115824274B (en) * | 2021-12-01 | 2024-03-01 | 深圳市速腾聚创科技有限公司 | Light detection circuit and photoelectric system |
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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: 20070418 Termination date: 20150418 |
|
| EXPY | Termination of patent right or utility model |