CN216122426U - Photoelectric conversion module control circuit - Google Patents
Photoelectric conversion module control circuit Download PDFInfo
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- CN216122426U CN216122426U CN202122764576.3U CN202122764576U CN216122426U CN 216122426 U CN216122426 U CN 216122426U CN 202122764576 U CN202122764576 U CN 202122764576U CN 216122426 U CN216122426 U CN 216122426U
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Abstract
The utility model relates to the technical field of communication, and provides a photoelectric conversion module control circuit which comprises a photoelectric conversion circuit, an amplifying circuit, a judging circuit and a timing extraction circuit, wherein the photoelectric conversion circuit, the amplifying circuit and the judging circuit are sequentially connected, the input end of the timing extraction circuit is connected with the amplifying circuit, the output end of the timing extraction circuit is connected with the judging circuit, the photoelectric conversion circuit is used for receiving optical signals, the output end of the judging circuit is used for outputting electric signals, the photoelectric conversion circuit comprises a first photoelectric conversion circuit and a second photoelectric conversion circuit, the circuit structures of the first photoelectric conversion circuit and the second photoelectric conversion circuit are the same, and the input end of the first photoelectric conversion circuit is used for receiving the optical signals. Through the technical scheme, the problem that the signal-to-noise ratio of the photoelectric conversion module is low in the prior art is solved.
Description
Technical Field
The utility model relates to the technical field of communication, in particular to a photoelectric conversion module control circuit.
Background
The photoelectric module is a main component of the optical transmission device and is used for photoelectric conversion, namely, an electric signal is converted into an optical signal firstly, the optical signal is transmitted through an optical fiber, and the transmitted optical signal is converted into the electric signal through the photoelectric module. The photoelectric module is matched with the optical fiber for transmission, so that the long-distance transmission of electric signals can be realized, the attenuation is small, and the interference of electromagnetic noise is avoided. The performance of the photoelectric conversion module directly determines the performance of the whole transmission system, and the input signal of the photoelectric conversion module is usually weak and easily submerged in various noises, so that the signal-to-noise ratio of the photoelectric conversion module is urgently needed to improve the performance of the signal transmission system.
SUMMERY OF THE UTILITY MODEL
The utility model provides a photoelectric conversion module control circuit, which solves the problem of low signal-to-noise ratio of a photoelectric conversion module in the related technology.
The technical scheme of the utility model is as follows: comprises a photoelectric conversion circuit, an amplifying circuit and a decision circuit which are connected in sequence, and also comprises a timing extraction circuit, wherein the input end of the timing extraction circuit is connected with the amplifying circuit, the output end of the timing extraction circuit is connected with the decision circuit, the photoelectric conversion circuit is used for receiving optical signals, the output end of the decision circuit is used for outputting electric signals,
the photoelectric conversion circuit comprises a first photoelectric conversion circuit and a second photoelectric conversion circuit, the circuit structures of the first photoelectric conversion circuit and the second photoelectric conversion circuit are the same, the input end of the first photoelectric conversion circuit is used for receiving optical signals,
the amplifying circuit comprises an operational amplifier U2A, a triode Q1, an operational amplifier U2B, a triode Q2 and an operational amplifier U3, wherein the inverting input end of the operational amplifier U2A is connected with the output end of the first photoelectric conversion circuit, the non-inverting input end of the operational amplifier U2A is grounded, the output end of the operational amplifier U2A is connected with the emitter of the triode Q1, the base of the triode Q1 is grounded, the collector of the triode Q1 is connected with the inverting input end of the operational amplifier U2A,
the inverting input end of the operational amplifier U2B is connected with the output end of the second photoelectric conversion circuit, the non-inverting input end of the operational amplifier U2B is grounded, the output end of the operational amplifier U2B is connected with the emitter of the triode Q2, the base of the triode Q2 is grounded, the collector of the triode Q2 is connected with the inverting input end of the operational amplifier U2B,
the output end of the operational amplifier U2A is connected to the inverting input end of the operational amplifier U3, the output end of the operational amplifier U2B is connected to the non-inverting input end of the operational amplifier U3, and the output end of the operational amplifier U3 is used as the output end of the amplifying circuit.
Further, the filter circuit comprises a resistor R12 and a capacitor C3, one end of the resistor R12 is connected with the output end of the operational amplifier U3, the other end of the resistor R12 is grounded through a capacitor C3, and one end, far away from the ground, of the capacitor C3 serves as the output end of the amplifying circuit.
Further, it is characterized in that the first and second light-emitting diodes are arranged in a matrix,
the first photoelectric conversion circuit comprises a photodiode LED1 and a resistor R1 which are connected in series, wherein the cathode of the photodiode LED1 is connected with a power supply VCC, one end of the resistor R1 is grounded,
still include operational amplifier U1A, the positive pole of photodiode LED1 passes through resistance R2 and inserts the inverting input end of operational amplifier U1A, the noninverting input end ground connection of operational amplifier U1A, the output of operational amplifier U1A passes through resistance R3 and inserts the inverting input end, the output of operational amplifier U1A is as the output of first photoelectric conversion circuit.
Further, the first photoelectric conversion circuit further comprises a capacitor C1, and the capacitor C1 is connected in parallel with the resistor R3.
Further, the decision circuit comprises an AND gate U5 and an operational amplifier U4A,
one input end of the AND gate U5 is connected with the output end of the amplifying circuit, the other input end of the AND gate U5 is used for being connected with a controller,
the non-inverting input end of the operational amplifier U4A is connected with the output end of the AND gate U5, the inverting input end of the operational amplifier U4A is connected with the reference voltage VREF, and the output end of the operational amplifier U4A is used as the output end of the decision circuit.
The reference source circuit comprises a resistor R11 and a resistor R28 which are connected in series, wherein one end of the resistor R11 is connected with a power supply VDD, and one end of the resistor R28 is grounded.
The working principle and the beneficial effects of the utility model are as follows:
in the utility model, by arranging the same first photoelectric conversion circuit and the same second photoelectric conversion circuit, the first photoelectric conversion circuit is used for receiving optical signals, the second photoelectric receiving circuit does not receive optical signals, and interference signals in the external environment can generate common-mode signals with the same amplitude and phase in the first photoelectric conversion circuit and the second photoelectric conversion circuit; two paths of common mode signals are respectively input to the inverting input ends of the operational amplifier U2A and the operational amplifier U2B, the operational amplifier U2A, the operational amplifier U2B and the operational amplifier U3 form a differential amplification circuit, and the common mode signals are filtered out, so that the effects of eliminating external environment noise and improving the signal-to-noise ratio are achieved.
A feedback channel of the operational amplifier U2A adopts a triode Q1, and the input and the output of the triode Q1 are in logarithmic function relation, so that an input signal of the operational amplifier U2A has a large dynamic range; a feedback channel of the operational amplifier U2B adopts a triode Q2, and the model of the triode Q1 is the same as that of the triode Q2, so that the circuit structures of the operational amplifier U2A and the operational amplifier U2B are symmetrical.
Resistance R11 and resistance R28 constitute resistance bleeder circuit, and the size of reference voltage VREF is the partial pressure of resistance R28, according to actual need, through the size of adjusting resistance R11 and resistance R28, can adjust the size of reference voltage VREF, and the circuit is simple, convenient operation.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a photoelectric conversion circuit and an amplifying circuit according to the present invention;
FIG. 2 is a schematic diagram of a decision circuit in the present invention;
in the figure: 1 photoelectric conversion circuit, 2 amplifying circuit, 3 decision circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
As shown in fig. 1-2, the control circuit of the photoelectric conversion module of this embodiment includes a photoelectric conversion circuit, an amplifying circuit, a decision circuit, and a timing extraction circuit, the input terminal of the timing extraction circuit is connected to the amplifying circuit, the output terminal of the timing extraction circuit is connected to the decision circuit, the photoelectric conversion circuit is used for receiving optical signals, the output terminal of the decision circuit is used for outputting electrical signals,
the photoelectric conversion circuit comprises a first photoelectric conversion circuit and a second photoelectric conversion circuit, the circuit structures of the first photoelectric conversion circuit and the second photoelectric conversion circuit are the same, the input end of the first photoelectric conversion circuit is used for receiving optical signals,
the amplifying circuit comprises an operational amplifier U2A, a triode Q1, an operational amplifier U2B, a triode Q2 and an operational amplifier U3, wherein the inverting input end of the operational amplifier U2A is connected with the output end of the first photoelectric conversion circuit, the non-inverting input end of the operational amplifier U2A is grounded, the output end of the operational amplifier U2A is connected with the emitter of the triode Q1, the base of the triode Q1 is grounded, the collector of the triode Q1 is connected with the inverting input end of the operational amplifier U2A,
the inverting input end of the operational amplifier U2B is connected with the output end of the second photoelectric conversion circuit, the non-inverting input end of the operational amplifier U2B is grounded, the output end of the operational amplifier U2B is connected with the emitter of the triode Q2, the base of the triode Q2 is grounded, the collector of the triode Q2 is connected with the inverting input end of the operational amplifier U2B,
the output end of the operational amplifier U2A is connected to the inverting input end of the operational amplifier U3, the output end of the operational amplifier U2B is connected to the non-inverting input end of the operational amplifier U3, and the output end of the operational amplifier U3 is used as the output end of the amplifying circuit.
In this embodiment, by providing the same first photoelectric conversion circuit and the same second photoelectric conversion circuit, the first photoelectric conversion circuit is configured to receive an optical signal, and the second photoelectric receiving circuit does not receive the optical signal, an interference signal in an external environment will generate a common-mode signal with the same amplitude and the same phase in the first photoelectric conversion circuit and the second photoelectric conversion circuit; two paths of common mode signals are respectively input to the inverting input ends of the operational amplifier U2A and the operational amplifier U2B, the operational amplifier U2A, the operational amplifier U2B and the operational amplifier U3 form a differential amplification circuit, and the common mode signals are filtered out, so that the effects of eliminating external environment noise and improving the signal-to-noise ratio are achieved.
A feedback channel of the operational amplifier U2A adopts a triode Q1, and the input and the output of the triode Q1 are in logarithmic function relation, so that an input signal of the operational amplifier U2A has a large dynamic range; a feedback channel of the operational amplifier U2B adopts a triode Q2, and the model of the triode Q1 is the same as that of the triode Q2, so that the circuit structures of the operational amplifier U2A and the operational amplifier U2B are symmetrical.
Furthermore, the filter circuit comprises a resistor R12 and a capacitor C3, one end of the resistor R12 is connected with the output end of the operational amplifier U3, the other end of the resistor R12 is grounded through a capacitor C3, and the end, far away from the ground, of the capacitor C3 is used as the output end of the amplifying circuit.
The resistor R12 and the capacitor C3 form a filter circuit for filtering high-frequency signals at the output end of the operational amplifier U3 and preventing the high-frequency signals from entering the decision circuit to influence the output precision of the decision circuit.
Further, it is characterized in that the first and second light-emitting diodes are arranged in a matrix,
the first photoelectric conversion circuit includes a photodiode LED1 and a resistor R1 connected in series, a cathode of the photodiode LED1 is connected to a power supply VCC, one end of the resistor R1 is grounded,
the LED photoelectric conversion circuit further comprises an operational amplifier U1A, the anode of the photodiode LED1 is connected to the inverting input end of the operational amplifier U1A through a resistor R2, the non-inverting input end of the operational amplifier U1A is grounded, the output end of the operational amplifier U1A is connected to the inverting input end through a resistor R3, and the output end of the operational amplifier U1A serves as the output end of the first photoelectric conversion circuit.
With the difference of light intensity, the conduction current of the photodiode is different, the voltage division Uin of the resistor R1 is different, the optical signal is converted into voltage signals of different levels, and the voltage signals are preliminarily amplified by an inverse proportion amplifying circuit composed of the operational amplifier U1A and then sent to a subsequent circuit for further processing.
Further, the first photoelectric conversion circuit further includes a capacitor C1, and the capacitor C1 is connected in parallel with the resistor R3.
Due to the influence of the input capacitor and the load capacitor of the operational amplifier U1A, the phase of the output voltage of the operational amplifier U1A lags behind the input voltage, and once the phase lags to 180 degrees, the circuit becomes a positive feedback circuit and then oscillates; the capacitor C1 in this embodiment functions as phase compensation to avoid excessive phase lag.
Further, as shown in fig. 2, the decision circuit includes an and gate U5 and an operational amplifier U4A,
one input end of the AND gate U5 is connected with the output end of the amplifying circuit, the other input end of the AND gate U5 is used for being connected with the controller,
the non-inverting input end of the operational amplifier U4A is connected with the output end of the AND gate U5, the inverting input end of the operational amplifier U4A is connected with the reference voltage VREF, and the output end of the operational amplifier U4A is used as the output end of the decision circuit.
The PWM signal from the controller is a pulse signal with the same frequency as the original signal, the pulse signal is input into an AND gate U5 and is subjected to AND operation with the output voltage Uout of the amplifying circuit, so that the output voltage Uout is sampled at fixed time, and a voltage output signal Uout _1 is obtained; the output signal Uout _1 is input to the non-inverting input end of the operational amplifier U4A, compared with the reference voltage VREF, when the voltage of the output signal Uout _1 is greater than the reference voltage VREF, the operational amplifier U4A outputs high level, when the voltage of the output signal Uout _1 is less than the reference voltage VREF, the operational amplifier U4A outputs low level, and finally the decision circuit outputs a pulse signal (code element signal) with the same frequency as the original signal.
The reference source circuit further comprises a resistor R11 and a resistor R28 which are connected in series, one end of the resistor R11 is connected with a power supply VDD, and one end of the resistor R28 is grounded.
Resistance R11 and resistance R28 constitute resistance bleeder circuit, and the size of reference voltage VREF is the partial pressure of resistance R28, according to actual need, through the size of adjusting resistance R11 and resistance R28, can adjust the size of reference voltage VREF, and the circuit is simple, convenient operation.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The photoelectric conversion module control circuit comprises a photoelectric conversion circuit (1), an amplifying circuit (2), a decision circuit (3) and a timing extraction circuit, wherein the photoelectric conversion circuit, the amplifying circuit (2) and the decision circuit (3) are sequentially connected, the input end of the timing extraction circuit is connected with the amplifying circuit (2), the output end of the timing extraction circuit is connected with the decision circuit (3), the photoelectric conversion circuit (1) is used for receiving optical signals, and the output end of the decision circuit (3) is used for outputting electric signals, and the photoelectric conversion module control circuit is characterized in that,
the photoelectric conversion circuit (1) comprises a first photoelectric conversion circuit (1) and a second photoelectric conversion circuit, the circuit structures of the first photoelectric conversion circuit (1) and the second photoelectric conversion circuit are the same, the input end of the first photoelectric conversion circuit (1) is used for receiving optical signals,
the amplifying circuit (2) comprises an operational amplifier U2A, a triode Q1, an operational amplifier U2B, a triode Q2 and an operational amplifier U3, wherein the inverting input end of the operational amplifier U2A is connected with the output end of the first photoelectric conversion circuit (1), the non-inverting input end of the operational amplifier U2A is grounded, the output end of the operational amplifier U2A is connected with the emitter of the triode Q1, the base of the triode Q1 is grounded, the collector of the triode Q1 is connected with the inverting input end of the operational amplifier U2A,
the inverting input end of the operational amplifier U2B is connected with the output end of the second photoelectric conversion circuit (1), the non-inverting input end of the operational amplifier U2B is grounded, the output end of the operational amplifier U2B is connected with the emitter of the triode Q2, the base of the triode Q2 is grounded, the collector of the triode Q2 is connected with the inverting input end of the operational amplifier U2B,
the output end of the operational amplifier U2A is connected to the inverting input end of the operational amplifier U3, the output end of the operational amplifier U2B is connected to the non-inverting input end of the operational amplifier U3, and the output end of the operational amplifier U3 serves as the output end of the amplifying circuit (2).
2. The photoelectric conversion module control circuit according to claim 1, further comprising a filter circuit, wherein the filter circuit comprises a resistor R12 and a capacitor C3, one end of the resistor R12 is connected to the output terminal of the operational amplifier U3, the other end of the resistor R12 is grounded through a capacitor C3, and the end of the capacitor C3 far away from the ground is used as the output terminal of the amplifier circuit (2).
3. The photoelectric conversion module control circuit according to claim 1,
the first photoelectric conversion circuit (1) comprises a photodiode LED1 and a resistor R1 which are connected in series, wherein the cathode of the photodiode LED1 is connected with a power supply VCC, one end of the resistor R1 is grounded,
still include operational amplifier U1A, the positive pole of photodiode LED1 passes through resistance R2 and inserts the inverting input end of operational amplifier U1A, the noninverting input end ground of operational amplifier U1A, the output of operational amplifier U1A passes through resistance R3 and inserts the inverting input end, the output of operational amplifier U1A is as the output of first photoelectric conversion circuit (1).
4. The photoelectric conversion module control circuit according to claim 3, wherein the first photoelectric conversion circuit (1) further comprises a capacitor C1, and the capacitor C1 is connected in parallel with the resistor R3.
5. The photoelectric conversion module control circuit according to claim 1, wherein the decision circuit (3) comprises an AND gate U5 and an operational amplifier U4A,
one input end of the AND gate U5 is connected with the output end of the amplifying circuit (2), the other input end of the AND gate U5 is used for being connected with a controller,
the non-inverting input end of the operational amplifier U4A is connected with the output end of the AND gate U5, the inverting input end of the operational amplifier U4A is connected with the reference voltage VREF, and the output end of the operational amplifier U4A is used as the output end of the decision circuit (3).
6. The photoelectric conversion module control circuit according to claim 5, further comprising a reference source circuit including a resistor R11 and a resistor R28 connected in series, wherein one end of the resistor R11 is connected to a power supply VDD, and one end of the resistor R28 is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122764576.3U CN216122426U (en) | 2021-11-10 | 2021-11-10 | Photoelectric conversion module control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122764576.3U CN216122426U (en) | 2021-11-10 | 2021-11-10 | Photoelectric conversion module control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216122426U true CN216122426U (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122764576.3U Expired - Fee Related CN216122426U (en) | 2021-11-10 | 2021-11-10 | Photoelectric conversion module control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216122426U (en) |
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2021
- 2021-11-10 CN CN202122764576.3U patent/CN216122426U/en not_active Expired - Fee Related
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