CN202364228U - AGC (Automatic Gain Control) optical receiving module circuit - Google Patents
AGC (Automatic Gain Control) optical receiving module circuit Download PDFInfo
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- CN202364228U CN202364228U CN2011205229998U CN201120522999U CN202364228U CN 202364228 U CN202364228 U CN 202364228U CN 2011205229998 U CN2011205229998 U CN 2011205229998U CN 201120522999 U CN201120522999 U CN 201120522999U CN 202364228 U CN202364228 U CN 202364228U
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Abstract
The utility model discloses an AGC (Automatic Gain Control) optical receiving module circuit, which comprises a photoelectric conversion unit, a gain adjusting unit and a sampling and processing unit and is characterized by further comprising a radio frequency signal amplifying unit and a microcomputer processing unit, wherein the signal output end of the photoelectric conversion unit is respectively electrically connected to the input end of the radio frequency signal amplifying unit and the input end of the sampling and processing unit; the output end of the radio frequency signal amplifying unit is electrically connected to the gain adjusting unit; the output end of the sampling and processing unit is electrically connected to the input end of the microcomputer processing unit; and the output end of the microcomputer processing unit is electrically connected to the control end of the gain adjusting unit. The AGC optical receiving module has the beneficial effects that: the electric level of an attenuated electric signal can be kept stable, the adjusting range of the gain adjusting unit is 0-20dB, the control range of an optical signal, which corresponds to the adjusting range of the gain adjusting unit, is also improved to a range from -8 to +2dBm, all user requirements can be met, the control precision is high, and the finally output electric signal is more stable.
Description
[technical field]
The utility model relates to optical receiving circuit, particularly a kind of AGC Optical Receivers circuit.
[background technology]
Along with the fast development of electronic technology and optical fiber communication technology, optical-fibre communications is low because of the loss that it has, transmission frequency bandwidth, capacity is big, volume is little, electromagnetic interference in light weight, anti-, be difficult for advantages such as cross-talk, enjoys the insider to favor, and develops very fast.At present, optical fiber cable has got into the every field of wire communication, comprises fields such as post and telecommunications, broadcast communication, power communication, oil communication and military communication.Generally speaking, in order to reach farther Distance Transmission, often increase the Optical Receivers that can receive the faint light power signal at the terminal of Optical Fiber Transmission; Because optical power signals has loss in various degree in the process of transmission, so in the optical power signals of terminal node certain excursion is arranged, the jitter after amplifying; Therefore, need a control circuit to come the steady of regulating and controlling output voltage, the control range of AGC control circuit of the prior art is little; Be generally-6～0dBm; Because these two kinds of schemes all design on the mainboard, the dynamic range of index is restricted, for greater than-6～0dBm scope; Its control action is very not obvious, can not satisfy all users' the scope of application.
[utility model content]
The purpose of the utility model is to overcome above-mentioned deficiency, provides a kind of its control range big, the AGC Optical Receivers circuit that control precision is high.
The purpose of the utility model is to realize like this: it comprises photoelectric conversion unit (1), gain adjusting unit (3), sample processing unit (4); Its improvement is: also comprise radiofrequency signal amplifying unit (2) and computer processing unit (5); The signal output part of said photoelectric conversion unit (1) is electrically connected at the input of radiofrequency signal amplifying unit (2) and the input of sample processing unit (4) respectively; Convert light signal to the signal of telecommunication and export radiofrequency signal amplifying unit (2) to; Simultaneously, sample processing unit (4) is taked the signal of telecommunication of said photoelectric conversion unit (1) output; The output telecommunications of said radiofrequency signal amplifying unit (2) is connected in gain adjusting unit (3), exports the signal of telecommunication after amplifying to gain adjusting unit (3); The output of said sample processing unit (4) is electrically connected at the input of computer processing unit (5); The signal of telecommunication to taking carries out judgment processing, and exports computer processing unit (5) to through the A/D conversion, and the output of computer processing unit (5) is electrically connected at the control end of gain adjusting unit (3); The signal of telecommunication to sample processing unit (4) input carries out processing operations; Calculate the corresponding pad value of the signal of telecommunication, and export one and control signal to gain adjusting unit (3), the ride gain adjustment;
Photoelectric conversion unit comprises photocoupler (PIN), autotransformer (T1), sample conversion circuit, filter circuit; Said sample conversion circuit comprises first electric capacity (C1), first resistance (R1), second resistance (R2); Said first electric capacity (C1) is parallelly connected with first resistance (R1); Second resistance (R2) end is connected in an end of first resistance (R1), the other end ground connection of first resistance (R1), and the other end of second resistance (R2) is connected to the input of sample processing unit; Said filter circuit comprises second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4) and the 3rd resistance (R3); Said the 3rd electric capacity (C3) is parallelly connected with the 4th electric capacity (C4); One end of the 3rd resistance (R3) is connected with an end of second electric capacity (C2), and the other end of the other end of the 3rd resistance (R3) and second electric capacity (C2) correspondence respectively is connected in the two ends of the 4th electric capacity (C4); End input+12V the voltage that the 3rd electric capacity (C3) is connected with the 4th electric capacity (C4) and the 3rd resistance (R3), the other end ground connection of the 3rd electric capacity (C3); Said autotransformer (T1) comprises input, output, tap; A wherein pin of two output pins of photocoupler (PIN) is connected with the input of autotransformer (T1), and the node of first resistance (R1), second resistance (R2), first electric capacity (C1) is connected in another pin and the sample conversion circuit; Second electric capacity (C2) is connected with the node of the 3rd resistance (R3) in the tap of autotransformer (T1) and the filter circuit; The output of autotransformer (T1) connects first inductance (L1), the 6th electric capacity (C6) successively; One end ground connection of the 6th electric capacity (C6), the node of first inductance (L1) and the 6th electric capacity (C6) is connected to the input of rf signal amplification circuit.
In the said structure; Said radiofrequency signal amplifying unit (2) comprises first order amplifying circuit (21), second level amplifying circuit (22) and transformation filter circuit (23); Described gain adjusting unit (3) is electrically connected between first order amplifying circuit (21) and the second level amplifying circuit (22), and transformation filter circuit (23) is electrically connected at the output of second level amplifying circuit (22).
The utility model beneficial effect is: the utility model converts light signal to the signal of telecommunication through photoelectric conversion unit, exports this signal of telecommunication to the radiofrequency signal amplifying unit and carries out the signal amplification, and the signal of telecommunication of process processing and amplifying exports gain adjusting unit to; Meanwhile, sample processing unit is taked the signal of telecommunication of photoelectric conversion unit output, and it is carried out the A/D conversion; Export computer processing unit to dc level signal; The corresponding pad value of this level signal is judged, calculated to computer processing unit to the level signal of sampling unit output, simultaneously, converts this pad value to a control signal and export gain adjusting unit to; Gain adjusting unit is carried out the decay of respective amplitude to the signal of telecommunication of radio frequency signal amplification unit circuit output; By this, make the level of the signal of telecommunication after decaying keep stable, the adjusting range of its gain adjusting unit is 0-20dB; The control range of the light signal corresponding with it also brings up to-8 to+2dBm; Satisfy all user's requests, control precision is high, and the signal of telecommunication of final output is more stable.
[description of drawings]
Fig. 1 is the theory diagram of the utility model
Fig. 2 is the schematic diagram of the utility model
[embodiment]
Below in conjunction with accompanying drawing and concrete execution mode the utility model is described further:
With reference to shown in Figure 1; The utility model has disclosed a kind of AGC Optical Receivers circuit; It comprises photoelectric conversion unit 1, gain adjusting unit 3, sample processing unit 4; Also comprise radiofrequency signal amplifying unit 2 and computer processing unit 5, the signal output part of said photoelectric conversion unit 1 is electrically connected at the input of radiofrequency signal amplifying unit 2 and the input of sample processing unit 4 respectively, converts light signal to the signal of telecommunication and exports radiofrequency signal amplifying unit 2 to; Simultaneously, sample processing unit 4 is taked the signal of telecommunication of said photoelectric conversion unit 1 output; The output telecommunications of said radiofrequency signal amplifying unit 2 is connected in gain adjusting unit 3, exports the signal of telecommunication after amplifying to gain adjusting unit 3; The output of said sample processing unit 4 is electrically connected at the input of computer processing unit 5; The signal of telecommunication to taking carries out judgment processing, and changes the unit 5 that exports MICROCOMPUTER PROCESSING to through A/D, and the output of computer processing unit 5 is electrically connected at the control end of gain adjusting unit 3; The signal of telecommunication to sample processing unit 4 inputs carries out processing operations; Calculate the corresponding pad value of the signal of telecommunication, and export one and control signal to gain adjusting unit 3, the ride gain adjustment.
With reference to shown in Figure 2; Photoelectric conversion unit 1 comprises photocoupler PIN, autotransformer T1, sample conversion circuit, filter circuit; Said sample conversion circuit comprises first capacitor C 1, first resistance R 1, second resistance R 2; Said first capacitor C 1 is parallelly connected with first resistance R 1, and second resistance R, 2 one ends are connected in an end of first resistance R 1, the other end ground connection of first resistance R 1; The other end of second resistance R 2 is connected to the input of sample processing unit, and promptly the OP/V terminals are connected with OP/V pin on the sample processing unit 4; Said filter circuit comprises second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and the 3rd resistance R 3; Said the 3rd capacitor C 3 is parallelly connected with the 4th capacitor C 4; One end of the 3rd resistance R 3 is connected with an end of second capacitor C 2, the corresponding respectively two ends that are connected in the 4th capacitor C 4 of the other end of the other end of the 3rd resistance R 3 and second capacitor C 2; End input+12V the voltage that the 3rd capacitor C 3 is connected with the 4th capacitor C 4 and the 3rd resistance R 3, the other end ground connection of the 3rd capacitor C 3; Said autotransformer T1 comprises input, output, tap; A wherein pin of two output pins of photocoupler PIN is connected with the input of autotransformer T1, and the node of first resistance R 1 in another pin and the sample conversion circuit, second resistance R 2, first capacitor C 1 is connected; Second capacitor C 2 is connected with the node of the 3rd resistance R 3 in the tap of autotransformer T1 and the filter circuit; The output of autotransformer T1 connects first inductance L 1, the 6th capacitor C 6 successively; One end ground connection of the 6th capacitor C 6; The node of first inductance L 1 and the 6th capacitor C 6 is connected to the input of rf signal amplification circuit, i.e. the corresponding connection of RF-INPUT link of its RF-INPUT link and radiofrequency signal amplifying unit 2; Light signal gets into the PIN pipe; Convert the signal of telecommunication to; One the tunnel carries out RF impedance conversion back through single-circuit transformer T1 exports from 3 pin; The singlechip chip P0.1 pin that the sample conversion circuit input to sample processing unit 4 is formed via first capacitor C 1, first resistance R 1, second resistance R 2 in another road, changes table through luminous power and voltage, can calculate the ratio range of first resistance R 1, second resistance R 2; First capacitor C 1 is a filter capacitor, and first inductance L 1 and 6 pairs of signals of the 6th capacitor C play impedance fine setting effect.
Forming of sample processing unit 4 by singlechip chip U8, program input port J2 etc.; Singlechip chip U8 is through the signal sampling of port P0.6 to photoelectric conversion unit 1; Judge through singlechip chip U8 internal processes; Again through inner A/D conversion back output current signal to computer processing unit 5, when the inner A/D conversion of singlechip chip U8 output current produces pressure drop during to ground through resistance R 13, the resistance R 15 power takings resistance R13 force feed that powers on is gone into operational amplifier U7B and is carried out multiple and amplify; Through correlation computations formula in the operational amplifier calculate resistance R 14 and resistance R 16 resistance values; Operational amplifier U7A is to establish water circuit for the back level partly, but the sustaining voltage value is steady, and voltage signal exports the control end of gain adjusting unit 3 to through the output of operational amplifier U7A; Pad value according to computer processing unit 5 is adjusted the signal of telecommunication gain from radiofrequency signal amplifying unit 2, and adjusting range is 0-20dB; Resistance R 6, resistance R 12 are as the bias circuit of Q1, Q2; Resistance R 7, R8, R9 are as the build-out resistor of Q1, Q2; Capacitor C 19, C20 adjust flat permanent effect to the biasing circuit slight resistance; Resistance R 10, R11 are as the flat permanent bleeder circuit of gain adjusting unit 3 voltages, and capacitor C 18, C21 are capacitances.Radiofrequency signal amplifying unit 2 comprises first order amplifying circuit 21, second level amplifying circuit 22 and transformation filter circuit 23; Described gain adjusting unit 3 is electrically connected between first order amplifying circuit 21 and the second level amplifying circuit 22; Transformation filter circuit 23 is electrically connected at the output of second level amplifying circuit 22; Wherein, amplifier U1, capacitor C 7, C8, C9, C10 and diode D1, inductance L 2 etc. are formed first order amplifying circuit, and amplifier U2, capacitor C 11, C12, C13, C14 and diode D2, inductance L 3 etc. are formed second level amplifying circuit; Diode D1, diode D2 are 5V protection diode; Capacitor C 7, capacitor C 8 and capacitor C 12, capacitor C 13 are capacitance, and resistance R 4 and capacitor C 10 are used for the signal impedance fine setting with resistance R 5 and capacitor C 11, and capacitor C 9 and capacitor C 14 are power filtering capacitors; The signal of telecommunication that final adjustment is accomplished carries out exporting from 2 pin after the impedance matching through transformer T2 once more; Wherein capacitor C 15, capacitor C 16, inductance L 5 are formed a filter circuit, can filter 50MHz signal in the past, and capacitor C 17 is used for the reflection fine setting.
To sum up, the utility model converts light signal to the signal of telecommunication through photoelectric conversion unit 1, exports this signal of telecommunication to radiofrequency signal amplifying unit 2 and carries out signal and amplify; The signal of telecommunication through processing and amplifying exports gain adjusting unit 3 to, and meanwhile, sample processing unit 4 is taked the signal of telecommunication of photoelectric conversion unit 1 output; And it is carried out A/D transform, exporting computer processing unit 5 to dc level signal, the corresponding pad value of this level signal is judged, calculated to the level signal of 5 pairs of sample processing units of computer processing unit, 4 outputs; Simultaneously; Convert this pad value to a control signal and export gain adjusting unit 3 to, the signal of telecommunication of 3 pairs of radio frequency signal amplification unit 2 circuit outputs of gain adjusting unit carries out the decay of respective amplitude, by this; Make the level of the signal of telecommunication after decaying keep stable; The adjusting range of its gain adjusting unit 3 is 0-20dB, and the control range of the light signal corresponding with it also brings up to-8 to+2dBm, satisfies all user's requests; Control precision is high, and the signal of telecommunication of final output is more stable.
According to the announcement and the instruction of above-mentioned specification, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection range of claim of the present invention modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (2)
1. AGC Optical Receivers circuit; It comprises photoelectric conversion unit (1), gain adjusting unit (3), sample processing unit (4); It is characterized in that: also comprise radiofrequency signal amplifying unit (2) and computer processing unit (5); The signal output part of said photoelectric conversion unit (1) is electrically connected at the input of radiofrequency signal amplifying unit (2) and the input of sample processing unit (4) respectively; Convert light signal to the signal of telecommunication and export radiofrequency signal amplifying unit (2) to, simultaneously, sample processing unit (4) is taked the signal of telecommunication of said photoelectric conversion unit (1) output; The output telecommunications of said radiofrequency signal amplifying unit (2) is connected in gain adjusting unit (3), exports the signal of telecommunication after amplifying to gain adjusting unit (3); The output of said sample processing unit (4) is electrically connected at the input of computer processing unit (5); The signal of telecommunication to taking carries out judgment processing, and exports computer processing unit (5) to through the A/D conversion, and the output of computer processing unit (5) is electrically connected at the control end of gain adjusting unit (3); The signal of telecommunication to sample processing unit (4) input carries out processing operations; Calculate the corresponding pad value of the signal of telecommunication, and export one and control signal to gain adjusting unit (3), the ride gain adjustment;
Photoelectric conversion unit comprises photocoupler (PIN), autotransformer (T1), sample conversion circuit, filter circuit; Said sample conversion circuit comprises first electric capacity (C1), first resistance (R1), second resistance (R2); Said first electric capacity (C1) is parallelly connected with first resistance (R1); Second resistance (R2) end is connected in an end of first resistance (R1), the other end ground connection of first resistance (R1), and the other end of second resistance (R2) is connected to the input of sample processing unit; Said filter circuit comprises second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4) and the 3rd resistance (R3); Said the 3rd electric capacity (C3) is parallelly connected with the 4th electric capacity (C4); One end of the 3rd resistance (R3) is connected with an end of second electric capacity (C2), and the other end of the other end of the 3rd resistance (R3) and second electric capacity (C2) correspondence respectively is connected in the two ends of the 4th electric capacity (C4); End input+12V the voltage that the 3rd electric capacity (C3) is connected with the 4th electric capacity (C4) and the 3rd resistance (R3), the other end ground connection of the 3rd electric capacity (C3); Said autotransformer (T1) comprises input, output, tap; A wherein pin of two output pins of photocoupler (PIN) is connected with the input of autotransformer (T1), and the node of first resistance (R1), second resistance (R2), first electric capacity (C1) is connected in another pin and the sample conversion circuit; Second electric capacity (C2) is connected with the node of the 3rd resistance (R3) in the tap of autotransformer (T1) and the filter circuit; The output of autotransformer (T1) connects first inductance (L1), the 6th electric capacity (C6) successively; One end ground connection of the 6th electric capacity (C6), the node of first inductance (L1) and the 6th electric capacity (C6) is connected to the input of rf signal amplification circuit.
2. AGC Optical Receivers circuit according to claim 1; It is characterized in that: said radiofrequency signal amplifying unit (2) comprises first order amplifying circuit (21), second level amplifying circuit (22) and transformation filter circuit (23); Described gain adjusting unit (3) is electrically connected between first order amplifying circuit (21) and the second level amplifying circuit (22), and transformation filter circuit (23) is electrically connected at the output of second level amplifying circuit (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205229998U CN202364228U (en) | 2011-12-14 | 2011-12-14 | AGC (Automatic Gain Control) optical receiving module circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205229998U CN202364228U (en) | 2011-12-14 | 2011-12-14 | AGC (Automatic Gain Control) optical receiving module circuit |
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| CN202364228U true CN202364228U (en) | 2012-08-01 |
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| CN2011205229998U Expired - Fee Related CN202364228U (en) | 2011-12-14 | 2011-12-14 | AGC (Automatic Gain Control) optical receiving module circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506244A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control circuit for management type household optical receiving machine |
| CN104506245A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | ATT control method for management type household optical receiving machine |
| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
| CN104617902A (en) * | 2014-12-16 | 2015-05-13 | 上海新纳通信技术有限公司 | Automatic cable television optical receiver gain control method by using light power |
| CN108702138A (en) * | 2016-03-04 | 2018-10-23 | 爱特梅尔公司 | Automatic growth control for the instruction of received signal intensity |
-
2011
- 2011-12-14 CN CN2011205229998U patent/CN202364228U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617902A (en) * | 2014-12-16 | 2015-05-13 | 上海新纳通信技术有限公司 | Automatic cable television optical receiver gain control method by using light power |
| CN104506244A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control circuit for management type household optical receiving machine |
| CN104506245A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | ATT control method for management type household optical receiving machine |
| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
| CN108702138A (en) * | 2016-03-04 | 2018-10-23 | 爱特梅尔公司 | Automatic growth control for the instruction of received signal intensity |
| CN108702138B (en) * | 2016-03-04 | 2022-11-08 | 爱特梅尔公司 | Automatic gain control for received signal strength indication |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Address after: Five road in Longgang District of Shenzhen City, Guangdong province 518000 Longgang Street Baolong Baolong community No. 2 Shang Rong industrial plant and 501 B1301 plant Patentee after: SHENZHEN WANHE TECHNOLOGY CO., LTD. Address before: Longgang District of Shenzhen City, five road, 518000 No. 2 Guangdong province science and Technology Park Shangrong third floor D Patentee before: Shenzhen Sanland Electronic Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20201214 |