CN116886053A - Photoelectric conversion amplifying circuit and photoelectric conversion device - Google Patents
Photoelectric conversion amplifying circuit and photoelectric conversion device Download PDFInfo
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- CN116886053A CN116886053A CN202310909333.5A CN202310909333A CN116886053A CN 116886053 A CN116886053 A CN 116886053A CN 202310909333 A CN202310909333 A CN 202310909333A CN 116886053 A CN116886053 A CN 116886053A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 107
- 239000003990 capacitor Substances 0.000 claims abstract description 42
- 230000002093 peripheral effect Effects 0.000 claims abstract description 35
- 238000001914 filtration Methods 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 20
- 238000012805 post-processing Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 abstract description 10
- 238000004891 communication Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 7
- 239000013307 optical fiber Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
- H03K19/14—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
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Abstract
The application discloses a photoelectric conversion amplifying circuit and a photoelectric conversion device, which relate to the technical field of optical communication equipment, and the photoelectric conversion amplifying circuit provided by the application comprises: the transimpedance amplifier chip is connected with the chip peripheral circuit, the first capacitor is arranged on a feedback loop in the chip peripheral circuit and is connected with a feedback resistor in the feedback loop in parallel, and the feedback loop in the second capacitor chip peripheral circuit is connected with the feedback resistor in parallel; the third capacitor and the fourth capacitor are connected in parallel between the outgoing line of the positive voltage input end and the grounding end; one end of the pull-down resistor is connected with the output end of the transimpedance amplifier chip, and the other end of the pull-down resistor is connected with the negative voltage input end. The feedback capacitor is connected in parallel with the feedback loop of the peripheral circuit, so that noise generated by the feedback resistor can be reduced, the system stability is improved, and meanwhile, the phenomenon of low swing of a single power supply caused by the single power supply characteristic of a chip of the traditional amplifying circuit is overcome by connecting the pull-down resistor to the output end of the photoelectric conversion amplifying circuit, so that the photoelectric conversion precision is improved.
Description
Technical Field
The present application relates to the field of optical communication devices, and in particular, to a photoelectric conversion amplifying circuit and a photoelectric conversion device.
Background
With the rapid development of information transmission in society, optical fiber communication is becoming more important. The optical fiber communication system mainly comprises: optical signal reception, optical signal transmission, optical fiber, optical repeater. The receiving circuit is used as the last ring of the whole optical communication system, and the signal carried by the optical carrier in the optical fiber transmission is recovered on the premise of small noise and no distortion. This characteristic reflects the ability of the entire fiber signal to recover, directly affecting the quality of the fiber transmission and even the subsequent operation.
The photoelectric conversion circuit is an important component in the receiving circuit and is responsible for converting the optical signals transmitted in the optical fibers into the electrical signals which can be identified by the terminal, the structure of the current photoelectric conversion circuit is shown in fig. 1, the photoelectric conversion circuit is simple in structure and low in cost, and the photoelectric conversion circuit is widely used in many scenes, but has the technical problem of large conversion errors.
Disclosure of Invention
The application provides a photoelectric conversion amplifying circuit and a photoelectric conversion device, which are used for solving the technical problem of large error of the existing photoelectric conversion device.
To solve the above technical problem, a first aspect of the present application provides a photoelectric conversion amplifying circuit, including: a transimpedance amplifier chip and a chip peripheral circuit, the chip peripheral circuit comprising: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the pull-down resistor;
the first capacitor is arranged on a feedback loop in the chip peripheral circuit and is connected in parallel with a feedback resistor in the feedback loop, and the second capacitor is connected in parallel with the feedback loop in the chip peripheral circuit;
the positive voltage input end in the chip peripheral circuit is provided with an outgoing line which is used for being connected with a grounding end, and the third capacitor and the fourth capacitor are connected between the outgoing line and the grounding end in parallel;
one end of the pull-down resistor is connected with the output end of the transimpedance amplifier chip, and the other end of the pull-down resistor is connected with the negative voltage input end.
Preferably, the transimpedance amplifier chip is specifically an OPA380AID transimpedance amplifier chip.
Preferably, the numerical relation between the first capacitor and the feedback resistor is specifically:
wherein C is 1 R is the capacitance value of the first capacitor 1 For the resistance value of the feedback resistor, f p Is the bandwidth of the amplifier circuit.
Meanwhile, a second aspect of the present application provides a photoelectric conversion apparatus comprising: a front conversion module and a rear processing module;
the front-end conversion module comprises: a first photoelectric conversion amplifying circuit provided as a first aspect of the present application;
the post-processing module comprises: a transimpedance amplifying circuit and a filtering processing circuit;
the input end of the transimpedance amplifying circuit is connected with the output end of the pre-conversion module, the output end of the transimpedance amplifying circuit is connected with the input end of the filtering processing circuit, and the output end of the filtering processing circuit is used for being connected with the output end of the photoelectric conversion device.
Preferably, the method further comprises: a first selection switching device;
the first selection switch device comprises a plurality of input ends which are respectively connected with the input ends of the multipath pre-conversion modules, and the output ends are connected with the input ends of the post-processing modules.
Preferably, the pre-conversion module further comprises: a second photoelectric conversion amplifying circuit;
the second photoelectric conversion amplifying circuit includes: the OPA858 amplifying chip and a chip peripheral circuit, wherein a cathode of a photodiode in the chip peripheral circuit is connected with an input end of the OPA858 amplifying chip, and an anode is connected with a grounding end.
Preferably, the pre-conversion module further comprises: third photoelectric conversion amplifying circuit
The third photoelectric conversion amplifying circuit includes: the OPA858 amplifying chip and a chip peripheral circuit, wherein the anode of a photodiode in the chip peripheral circuit is connected with the input end of the OPA858 amplifying chip, and the cathode is connected with the positive voltage input end.
Preferably, the filter processing circuit includes: a low pass filtering branch and/or a high pass filtering branch.
Preferably, the filter processing circuit further includes: there is no filtering output branch.
Preferably, the power supply module of the photoelectric conversion device is a power supply circuit of a type-c interface.
From the above technical solutions, the embodiment of the present application has the following advantages:
the photoelectric conversion amplifying circuit provided by the application comprises: the transimpedance amplifier chip is connected with the chip peripheral circuit, the first capacitor is arranged on a feedback loop in the chip peripheral circuit and is connected with a feedback resistor in the feedback loop in parallel, and the feedback loop in the second capacitor chip peripheral circuit is connected with the feedback resistor in parallel; the third capacitor and the fourth capacitor are connected in parallel between the outgoing line of the positive voltage input end and the grounding end; one end of the pull-down resistor is connected with the output end of the transimpedance amplifier chip, and the other end of the pull-down resistor is connected with the negative voltage input end. According to the scheme, on the basis of a transimpedance amplifier circuit, the feedback loop of the peripheral circuit is connected with the feedback capacitor in parallel, so that noise generated by the feedback resistor can be reduced, output noise is reduced, and system stability is improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a conventional photoelectric conversion circuit.
Fig. 2 is a schematic circuit diagram of an embodiment of a photoelectric conversion amplifying circuit according to the present application.
Fig. 3 is a schematic structural diagram of an embodiment of a photoelectric conversion device according to the present application.
Fig. 4 is a schematic circuit diagram of another embodiment of a photoelectric conversion amplifying circuit in a photoelectric conversion device according to the present application.
Fig. 5 is a schematic circuit diagram of another embodiment of a photoelectric conversion amplifying circuit in a photoelectric conversion device according to the present application.
Fig. 6 is a schematic circuit diagram of an embodiment of a post-processing module in a photoelectric conversion device according to the present application.
Fig. 7 is a schematic circuit diagram of a power supply circuit embodiment in a photoelectric conversion device according to the present application.
Detailed Description
The conventional photoelectric conversion circuit structure shown in fig. 1 is based on a circuit of a general transimpedance amplifier connection resistor. The optical signal is converted into a current signal by means of a PIN diode. And then the current signal is converted into a voltage signal through a transimpedance amplifier. The circuit then shapes the voltage signal for output. According to the technical problems, the research discovers that the reason for causing the large conversion error is that the circuit structure is too simple, the circuit structure is easy to be interfered, the output voltage cannot reach 0V, the error is caused, and the current situation of the large conversion error is finally caused. In view of the above, the embodiment of the application provides a photoelectric conversion amplifying circuit and a photoelectric conversion device, which are used for solving the technical problem of large error of the existing photoelectric conversion device.
In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 2, a first embodiment of the present application provides a photoelectric conversion amplifying circuit, which includes: transimpedance amplifier chip U7 and chip peripheral circuitry, the chip peripheral circuitry comprising: a first capacitor C1, a second capacitor C2, a third capacitor C6, a fourth capacitor C7, and a pull-down resistor R8;
the first capacitor C1 is arranged on a feedback loop in the peripheral circuit of the chip and is connected with the feedback resistor R1 in the feedback loop in parallel, and the feedback loop in the peripheral circuit of the chip of the second capacitor C2 is connected with the feedback loop in parallel;
the positive voltage input end in the peripheral circuit of the chip is provided with an outgoing line which is used for being connected with a grounding end, and the third capacitor and the fourth capacitor are connected between the outgoing line and the grounding end in parallel;
one end of the pull-down resistor R8 is connected with the output end of the transimpedance amplifier chip U7, and the other end is connected with the negative voltage input end. The positive voltage input of this embodiment is +5V, and the negative voltage input is-5V.
More specifically, the transimpedance amplifier chip is specifically an OPA380AID transimpedance amplifier chip.
More specifically, the numerical relationship between the first capacitance and the feedback resistance is specifically:
wherein C1 is the capacitance value of the first capacitor C1, R1 is the resistance value of the feedback resistor R1, f p Is the bandwidth of the amplifier circuit in kHz.
It should be noted that, after the feedback resistance of the transimpedance amplifier increases, the circuit generally has poor noise performance. The noise generated by the feedback resistor increases linearly with the square root of the resistance value, depending on the noise spectral density. Therefore, in the circuit structure provided by the embodiment, the feedback resistor is connected in parallel with the feedback capacitor, so that when the feedback resistor is connected in parallel with the feedback capacitor with a proper capacitance, the output noise can be reduced, and the system stability can be improved. And the capacitor can ensure phase margin, introduce zero points, etc. Meanwhile, due to the single power supply characteristic of the chip, there is a limit of output swing, namely, the amplifier may swing as low as near as the single power supply, but not as high as 0V; therefore, the trans-impedance amplifier can reach 0V through connecting 10KΩ pull-down resistor with-5V. The photoelectric conversion accuracy is improved.
The above description of one embodiment of a photoelectric conversion amplifying circuit provided by the present application is the following description of one embodiment of a photoelectric conversion device provided by the present application, which is specifically as follows:
referring to fig. 3, a second embodiment of the present application provides a photoelectric conversion device, including: a front conversion module A and a rear processing module B;
the front conversion module a includes: a first photoelectric conversion amplifying circuit provided as a first embodiment of the present application;
the post-processing module B includes: a transimpedance amplifying circuit and a filtering processing circuit;
the input end of the transimpedance amplifying circuit is connected with the output end of the pre-conversion module A, the output end of the transimpedance amplifying circuit is connected with the input end of the filtering processing circuit, and the output end of the filtering processing circuit is used for being connected with the output end of the photoelectric conversion device.
As shown in fig. 2, the photoelectric conversion device provided in this embodiment includes: the pre-conversion module a and the post-processing module B, where the pre-conversion module a may be a photoelectric conversion amplifying circuit provided in the first embodiment of the present application, and is configured to convert a received optical signal into an electrical signal, and the post-processing module B is configured to perform signal optimization processing on the electrical signal converted by the pre-conversion module a.
As shown in fig. 6, the post-processing module B provided in this embodiment includes: a transimpedance amplification circuit for reamplifying the converted electric signal and a filter processing circuit for filtering the amplified electric signal. The low-pass filtering branch and/or the high-pass filtering branch may be further selectively set: the filter processing branches can select a proper filtering mode to perform signal optimization according to actual application scenes by setting a selection switch without a filter output branch, so that the influence caused by noise interference is reduced, and the data accuracy is improved.
Further, the pre-conversion module a mentioned in this embodiment may further include, in addition to the circuit structure mentioned in the first embodiment: a second photoelectric conversion amplifying circuit;
the second photoelectric conversion amplifying circuit includes: OPA858 amplifying chip U1 and a chip peripheral circuit, wherein a cathode of a photodiode in the chip peripheral circuit is connected with an input end of the OPA858 amplifying chip, and an anode is connected with a grounding end;
as shown in fig. 4, the second photoelectric conversion amplifying circuit provided in the present embodiment is an amplifying circuit based on an OPA858 amplifying chip. The circuit is connected to the input of the OPA858 amplifying chip by connecting the anode of PIN photodiode U2 to ground. The PIN photodiode operates in a photovoltaic mode. The circuit is suitable for detecting weak light, and can be selectively connected when dark current is required to be small.
In addition, a resistor with a small resistance value is connected between the inverting input terminal of the OPA858 amplifying chip U2 and the PIN photodiode, so as to suppress resonance of internal capacitance and inductance.
Further, the pre-conversion module a further includes: third photoelectric conversion amplifying circuit
The third photoelectric conversion amplifying circuit includes: the OPA858 amplifying chip and the chip peripheral circuit, wherein the anode of the photodiode in the chip peripheral circuit is connected with the input end of the OPA858 amplifying chip, and the cathode is connected with the positive voltage input end.
It should be noted that, the third photoelectric conversion amplifying circuit provided in this embodiment is similar to the second photoelectric conversion amplifying circuit described above, and is an amplifying circuit based on an OPA858 amplifying chip. The difference is that the circuit is connected with +5V voltage at the cathode of the PIN photodiode U8, so that the circuit works in a photoconductive mode, and belongs to a photoelectric conversion amplifying circuit which is fixedly operated in the photoconductive mode.
Further, as shown in fig. 6, the photoelectric conversion device provided in this embodiment may further optionally include: the first selection switch device H3 is specifically arranged between the front conversion module A and the rear processing module B;
the first selection switch device H3 includes a plurality of input terminals, and is configured to be connected to the input terminals of the multiple pre-conversion modules a, and the output terminal is configured to be connected to the input terminal of the post-processing module B.
By arranging the first selection switch device H3, the multi-path photoelectric conversion amplifying circuit can be selected, so that one of the three photoelectric conversion amplifying circuits can be selected to be connected to the post-processing module B according to the actual application scene on the premise of not changing the circuit structure.
The photoelectric conversion device mentioned in this embodiment has three photoelectric conversion circuits and a selectable mode photoelectric conversion circuit, and can select channels with multiple gains (i.e., different feedback resistance values), and 8 gain resistances, and the filtering can select multi-order filtering, so as to implement a larger detection range.
Further, the power supply module C of the photoelectric conversion device provided in this embodiment is a power supply circuit of a type-C interface.
It should be noted that, as shown in fig. 7, the circuit has a type-c interface, and is externally connected with a +5v power supply, and then the power supply chip TPS60403DBVR converts the +5v into-5V for each circuit of the system.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A photoelectric conversion amplifying circuit, comprising: a transimpedance amplifier chip and a chip peripheral circuit, the chip peripheral circuit comprising: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the pull-down resistor;
the first capacitor is arranged on a feedback loop in the chip peripheral circuit and is connected in parallel with a feedback resistor in the feedback loop, and the second capacitor is connected in parallel with the feedback loop in the chip peripheral circuit;
the positive voltage input end in the chip peripheral circuit is provided with an outgoing line which is used for being connected with a grounding end, and the third capacitor and the fourth capacitor are connected between the outgoing line and the grounding end in parallel;
one end of the pull-down resistor is connected with the output end of the transimpedance amplifier chip, and the other end of the pull-down resistor is connected with the negative voltage input end.
2. The photoelectric conversion amplifying circuit according to claim 1, wherein the transimpedance amplifier chip is specifically an OPA380AID transimpedance amplifier chip.
3. The photoelectric conversion amplifying circuit according to claim 1, wherein the numerical relationship between the first capacitor and the feedback resistor is specifically:
wherein C is 1 R is the capacitance value of the first capacitor 1 For the resistance value of the feedback resistor, f p Is the bandwidth of the amplifier circuit.
4. A photoelectric conversion device, characterized by comprising: a front conversion module and a rear processing module;
the front-end conversion module comprises: a first photoelectric conversion amplifying circuit according to any one of claims 1 to 3;
the post-processing module comprises: a transimpedance amplifying circuit and a filtering processing circuit;
the input end of the transimpedance amplifying circuit is connected with the output end of the pre-conversion module, the output end of the transimpedance amplifying circuit is connected with the input end of the filtering processing circuit, and the output end of the filtering processing circuit is used for being connected with the output end of the photoelectric conversion device.
5. The photoelectric conversion device according to claim 4, further comprising: a first selection switching device;
the first selection switch device comprises a plurality of input ends which are respectively connected with the input ends of the multipath pre-conversion modules, and the output ends are connected with the input ends of the post-processing modules.
6. The photoelectric conversion device according to claim 5, wherein the front-end conversion module further comprises: a second photoelectric conversion amplifying circuit;
the second photoelectric conversion amplifying circuit includes: the OPA858 amplifying chip and a chip peripheral circuit, wherein a cathode of a photodiode in the chip peripheral circuit is connected with an input end of the OPA858 amplifying chip, and an anode is connected with a grounding end.
7. The photoelectric conversion device according to claim 5, wherein the front-end conversion module further comprises: third photoelectric conversion amplifying circuit
The third photoelectric conversion amplifying circuit includes: the OPA858 amplifying chip and a chip peripheral circuit, wherein the anode of a photodiode in the chip peripheral circuit is connected with the input end of the OPA858 amplifying chip, and the cathode is connected with the positive voltage input end.
8. The photoelectric conversion apparatus according to claim 4, wherein the filter processing circuit includes: a low pass filtering branch and/or a high pass filtering branch.
9. The photoelectric conversion apparatus according to claim 8, wherein the filter processing circuit further comprises: there is no filtering output branch.
10. The photoelectric conversion device according to claim 4, wherein the power supply module of the photoelectric conversion device is a power supply circuit of a type-c interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310909333.5A CN116886053A (en) | 2023-07-24 | 2023-07-24 | Photoelectric conversion amplifying circuit and photoelectric conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310909333.5A CN116886053A (en) | 2023-07-24 | 2023-07-24 | Photoelectric conversion amplifying circuit and photoelectric conversion device |
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| Publication Number | Publication Date |
|---|---|
| CN116886053A true CN116886053A (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310909333.5A Pending CN116886053A (en) | 2023-07-24 | 2023-07-24 | Photoelectric conversion amplifying circuit and photoelectric conversion device |
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| CN (1) | CN116886053A (en) |
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- 2023-07-24 CN CN202310909333.5A patent/CN116886053A/en active Pending
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