CN115473501A - Regulating and controlling circuit of trans-impedance amplifier and method for reducing influence of stray inductance on circuit - Google Patents
Regulating and controlling circuit of trans-impedance amplifier and method for reducing influence of stray inductance on circuit Download PDFInfo
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Abstract
The application discloses a regulating and controlling circuit of a trans-impedance amplifier and a method for reducing influence of stray inductance on the circuit. The adjusting and controlling circuit of the transimpedance amplifier is electrically connected with a signal transmission circuit, the signal transmission circuit comprises a photoelectric conversion element and a signal amplifier, the photoelectric conversion element is electrically connected with the signal amplifier, the transimpedance amplifier based on the wide input range comprises a signal acquirer, a resistance value adjustable module and a control module, the signal acquirer is electrically connected with the signal transmission circuit, and the signal acquirer can acquire an electric signal transmitted in the signal transmission circuit. The resistance value adjustable module is connected in series between the photoelectric conversion element and the signal amplifier. The control module is electrically connected with the signal acquirer and the resistance value adjustable module, and the control module transmits the electric signals acquired by the signal acquirer to the resistance value adjustable module.
Description
Technical Field
The invention relates to the field of integrated circuit chips, in particular to a regulating and controlling circuit of a trans-impedance amplifier and a method for reducing the influence of stray inductance on the circuit.
Background
The transimpedance amplifier is an amplifier for inputting a current signal and outputting a voltage signal, has the advantage of high bandwidth, and is widely used in a high-speed circuit. For example, in a modern high-speed optical fiber communication system, a transimpedance amplifier can convert and amplify a photocurrent signal generated by a photodiode into a voltage signal and output the voltage signal to the outside.
Because the transimpedance amplifier is generally located at the first stage of the high-speed circuit system, some stray inductance is often introduced into the input end of the transimpedance amplifier, the stray inductance can cause the transimpedance amplifier to generate ringing in processing a large input signal, and the ringing is worse as the input signal increases, so that the eye diagram quality of the high-speed signal output by the transimpedance amplifier is deteriorated. Therefore, the stray inductance affects the eye diagram quality of the output electrical signal of the transimpedance amplifier.
The existing mode of adopting series damping resistor to reduce stray inductance and to transimpedance amplifier output signal of telecommunication, and some application scenes need transimpedance amplifier with very wide input signal scope, when the resistance of series resistance is too big, pulse amplitude can reduce too much, and make the leading edge of pulse produce and delay, when the resistance of series resistance is too little, then do not play a role, transimpedance amplifier is in the application scene that needs wide input range, adopt fixed resistance then can't reach and reduce stray inductance and to the influence of signal.
Disclosure of Invention
One advantage of the present invention is to provide a regulating circuit of a transimpedance amplifier, wherein the control unit is capable of correspondingly changing the resistance of the resistance adjustable module according to an electrical signal of the signal transmission circuit, reducing the influence of the stray inductance on the electrical signal, and improving the eye diagram quality of an output signal of the transimpedance amplifier.
One advantage of the present invention is to provide a regulating circuit of a transimpedance amplifier, the regulating circuit of the transimpedance amplifier being electrically connected to a signal transmission circuit, the signal transmission circuit including a photoelectric conversion element and a signal amplifier, the photoelectric conversion element being electrically connected to the signal amplifier, the transimpedance amplifier based on a wide input range comprising:
the signal acquirer is electrically connected with the signal transmission circuit and can acquire the electric signal transmitted in the signal transmission circuit;
the resistance value adjustable module is connected between the photoelectric conversion element and the signal amplifier in series;
the control module is electrically connected with the signal acquirer and the resistance adjustable module, transmits the electric signal acquired by the signal acquirer to the resistance adjustable module, and enables the resistance of the resistance adjustable module to be correspondingly changed according to the received electric signal.
According to an embodiment of the present invention, the signal acquirer is configured to acquire the voltage signal output by the signal amplifier.
According to an embodiment of the present invention, the signal acquirer is implemented as a peak detection circuit, and the peak detection circuit is electrically connected to the output terminal of the signal amplifier.
According to an embodiment of the present invention, the resistance value adjustable module is implemented as an MOS transistor, and the MOS transistor is electrically connected to the peak detection circuit, so that the peak detection circuit inputs a voltage to the MOS transistor.
According to an embodiment of the present invention, the resistance value adjustable module is implemented to include a resistor string and a plurality of switch arrays, the plurality of switch arrays are electrically connected to the resistor string, the control module is electrically connected to the switch arrays, and the control module changes the closing of the switch arrays according to the electrical signal of the signal acquirer, so as to change the resistance value of the resistor string.
According to an embodiment of the present invention, the signal acquirer is configured to acquire a current signal output by the photoelectric conversion element.
According to an embodiment of the present invention, the resistance value control module is configured to be a resistor string and a plurality of switch arrays, the plurality of switch arrays are electrically connected to the resistor string, the control module is electrically connected to the switch arrays, and the control module changes the closing of the switch arrays according to the electrical signal of the signal acquirer, so as to change the resistance value of the resistor string.
According to an embodiment of the present invention, the electric signal acquirer is implemented as a current acquisition module including a first auxiliary circuit, a second auxiliary circuit, and a current acquisition circuit, the first auxiliary circuit is electrically connected to the photoelectric conversion element, the second auxiliary circuit is electrically connected to the first auxiliary circuit, the current acquisition circuit is electrically connected to the second auxiliary circuit, and the photoelectric conversion element is electrically connected to the same node as the current acquisition circuit at which the node is electrically connected to the second auxiliary circuit.
It is an advantage of the present invention to provide a method of reducing the effect of stray inductance on a circuit, characterized in that it comprises the steps of,
s1, acquiring an electric signal in a signal transmission circuit; and
and S2, correspondingly increasing or decreasing the resistance value of the resistance value adjustable module according to the magnitude of the electric signal acquired in the step S1.
According to an embodiment of the present invention, in the step S1, a current signal in the signal transmission circuit is obtained, and the current signal is correspondingly converted into a voltage signal.
According to an embodiment of the present invention, the voltage signal in the signal transmission circuit is obtained in the step S1.
Drawings
Fig. 1 shows a circuit schematic of a regulating circuit of a transimpedance amplifier according to the present invention.
Fig. 2 shows a circuit schematic diagram of another embodiment of the regulating circuit of the transimpedance amplifier according to the present invention.
Fig. 3 shows a circuit schematic diagram of another embodiment of the regulating circuit of the transimpedance amplifier according to the present invention.
FIG. 4 is a diagram showing simulation results of the regulating circuit of the transimpedance amplifier of the present invention, in which a current signal (current I) is inputted D，IN ) The simulation result is 2.7mA.
FIG. 5 is a graph showing simulation results without eliminating stray inductance, where the current signal (current I) is input D，IN ) The simulation result is 2.7mA.
FIG. 6 is a graph showing simulation results of the regulating circuit of the transimpedance amplifier of the present invention, in which a current signal (current I) is input D，IN ) The simulation result is 70uA.
FIG. 7 is a graph showing simulation results without eliminating stray inductance, where the current signal (current I) is input D，IN ) The simulation result is 70uA.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and simplicity in description, but do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular manner of operation, and thus, the terms are not to be construed as limiting the invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Referring to fig. 1 to 7, a regulating circuit of a transimpedance amplifier according to a preferred embodiment of the present invention will be described in detail below. As shown, the stray inductance is shown as L stray Shown. The regulating and controlling circuit of the transimpedance amplifier can correspondingly regulate the damping resistor according to the electric signal output in the signal transmission circuit, so that the transimpedance amplifier reduces the ringing phenomenon in a wide input signal range, and the eye pattern quality of the output electric signal is ensured.
The adjusting and controlling circuit of the transimpedance amplifier is electrically connected to a signal transmission circuit 100, the signal transmission circuit 100 includes a photoelectric conversion element 110 and a signal amplifier 120, the photoelectric conversion element 110 is electrically connected to the signal amplifier 120, wherein the photoelectric conversion element 110 is used for converting an optical signal into a current signal, the signal amplifier 120 is used for converting the current signal into a corresponding voltage signal, and the photoelectric conversion element 110 is electrically connected to the signal amplifier 120, so that the signal transmission circuit 100 can convert the optical signal into an electrical signal and output the electrical signal.
The regulating circuit of the transimpedance amplifier comprises a signal acquirer 10, a resistance value adjustable module 20 and a control module 30.
The signal acquirer 10 is electrically connected to the signal transmission circuit 100, and the signal acquirer 10 can acquire the electrical signal transmitted in the signal transmission circuit 100. The control module 30 is electrically connected to the signal acquirer 10, and the signal acquirer 10 can transmit the electrical signal acquired from the signal transmission circuit 100 to the control module 30. The resistance value adjustable module 20 is electrically connected to the control module 30, the resistance value adjustable module 20 is connected in series between the photoelectric conversion element 110 and the signal amplifier 120, and the resistance value adjustable module 20 can receive an electrical signal transmitted from the control module 30 and can correspondingly change its resistance value according to the received electrical signal, thereby achieving the purpose of adjusting the resistance value.
Specifically, in the process that the signal transmission circuit 100 converts the optical signal into the electrical signal and outputs the electrical signal, the signal acquirer 10 can acquire the electrical signal in the signal transmission circuit 100 in real time, and the control module 30 correspondingly adjusts and controls the resistance value adjustable module 20 according to the electrical signal acquired by the signal acquirer 10, so that when the electrical signal in the signal transmission circuit 100 changes, the resistance value of the resistance value adjustable module 20 correspondingly changes, so that the resistance value of the resistance value adjustable module 20 can correspondingly change according to the electrical signal in the signal transmission circuit 100. For example, when the electrical signal in the signal transmission circuit 100 is small, the resistance value of the resistance value adjustable module 20 is correspondingly small, and when the electrical signal in the signal transmission circuit 100 is large, the resistance value of the resistance value adjustable module 20 is correspondingly large. Therefore, in the process of transmitting the electrical signal by the signal transmission circuit 100, the resistance value of the resistance value adjustable module 20 can be changed correspondingly to the electrical signal of the signal transmission circuit 100, so that the resistance value of the resistance value adjustable module 20 can reduce the influence of the stray inductance on the electrical signal, and improve the eye diagram quality of the electrical signal output by the signal amplifier 120.
As shown in fig. 1, the photoelectric conversion element 110 is implemented as a photodiode PD that converts a received optical signal into an electrical signal and generates a photocurrent I D，IN . The signal amplifier 120 is implemented as an inverting amplifier, and a feedback resistor R is connected across the inverting amplifier F The photodiode PD converts the photocurrent I D，IN Is supplied to the inverting amplifier and outputs V through the inverting amplifier OUT A voltage. The resistance value adjustable module 20 is electrically connected between the photodiode PD and the inverting amplifier. When the signal transmission circuit 100 normally transmits an electrical signal, the resistance value of the resistance value adjustable module 20 changes correspondingly to the electrical signal, so that the influence of stray inductance on the electrical signal is reduced, and the eye diagram quality of the electrical signal output by the signal transmission circuit 100 is improved. Specifically, the signal acquirer 10 acquires an electrical signal from the signal transmission circuit 100 and outputs a voltage signal to the control module 30, where the voltage signal output by the signal acquirer 10 is related to the electrical signal acquired from the signal transmission circuit 100. As shown in FIG. 1, the voltage signal is denoted V in the figure dectet Said V is dectet Corresponds to the magnitude of the electrical signal transmitted by the signal transmission circuit 100, and the control module 30 is configured to control the output according to the received V dectet Correspondingly outputs a control voltage, which is marked as V in the figure ctrl The control voltage controls the resistance of the resistance adjustable module 20, so that the resistance of the resistance adjustable module 20 can be related to the magnitude of the electrical signal in the signal transmission circuit 100.
The signal acquirer 10 is configured to acquire the voltage signal V output by the signal amplifier 120 OUT . Accordingly, theThe signal acquirer 10 is implemented as a peak detection circuit that is electrically connected to the output of the signal amplifier 120. The peak detection circuit can output the voltage signal V output by the signal amplifier 120 OUT The resistance value of the resistance value adjustable module 20 is controlled by the control module 30, so that the change of the resistance value adjustable module 20 and the voltage signal V output by the signal amplifier 120 are obtained OUT And (4) correlating.
As shown in fig. 2, the Peak detection circuit is implemented as a Peak detet module. The Peak detret module is electrically connected to the output end of the signal amplifier 120, the Peak detret module transmits the received voltage signal to the control module 30, the control module 30 controls the resistance value of the resistance value adjustable module 20 according to the voltage signal output by the Peak detret module, and the change of the resistance value adjustable module 20 and the voltage signal V output by the signal amplifier 120 are achieved OUT Related objects are achieved.
The resistance value adjustable module 20 is implemented as an MOS transistor, which can be equivalent to an adjustable resistor, and the resistance value of the MOS transistor correspondingly changes with the change of voltage, so as to achieve the purpose of adjustable resistance value. The Peak detet module can directly input the acquired voltage signal to the MOS transistor, and correspondingly, the voltage of the MOS transistor can correspondingly change the resistance value of the MOS transistor according to the voltage signal, so that the resistance value of the MOS transistor and the voltage signal V output by the signal amplifier 120 are enabled to be equal OUT And (6) correlating.
Specifically, the MOS transistor realizes resistance adjustment within a specified voltage range, and the Peak Dectet module can adjust the resistance according to the voltage signal V output by the signal amplifier 120 OUT Is varied to obtain a control voltage V ctrl So that the voltage received by the MOS transistor is in the range of the adjustable resistance value of the MOS transistor, and the resistance value of the MOS transistor can be ensured to correspond to the control voltage V ctrl A change occurs.
For example, the resistance adjustable module 20 may further include a resistor string and a plurality of switch arrays, the switch arrays are electrically connected to the resistor string, and the resistance of the resistor string can be changed by opening and closing the switch arrays, so that the resistance of the resistance adjustable module 20 can be adjusted, and the resistance of the resistor string can be accurately adjusted by using the switch arrays and the resistor string.
Correspondingly, the control module 30 is electrically connected to the plurality of switch arrays, so that the control module 30 can adjust the opening and closing of the plurality of switch arrays, so that the control module 30 can adjust the resistance value of the resistor string electrically connected in the circuit. Specifically, the voltage signal V obtained by the Peak detlet module OUT Conversion to a control voltage V ctrl Then to the control module 30, the control module 30 being able to receive the control voltage V ctrl Converting the voltage signal into a digital signal, and controlling the switch array according to the digital signal to control the resistance of the resistor string, so that the resistance of the resistor string is equal to the voltage signal V output by the signal amplifier 120 OUT Correlation is performed so that the resistance of the resistor string is adjusted according to the voltage signal V output by the signal amplifier 120 OUT The resistance value of the resistor string can reduce the influence of stray inductance on the electrical signal, and the eye diagram quality of the electrical signal output by the signal amplifier 120 is improved.
The signal acquirer 10 is configured to acquire a current signal output from the photoelectric conversion element 110.
For example, when the resistance value control module 20 is implemented to include a resistor string and a plurality of switch arrays, the control module 30 converts the current signal acquired by the signal acquirer 10 into a digital signal, and controls the switch arrays according to the digital signal, so as to control the resistance value of the resistor string, so that the resistance value of the resistor string is related to the current output by the photoelectric conversion element 110, and thus the resistance value of the resistor string can reduce the influence of stray inductance on the electrical signal, and improve the quality of the eye diagram of the electrical signal output by the signal amplifier 120.
When the resistance value control module 20 is implemented as a MOS transistor, since the resistance value of the MOS transistor changes correspondingly with the change of the voltage, the control module 30 converts the current signal output by the photoelectric conversion element 110 into a voltage signal, and controls the resistance value of the MOS transistor through the converted voltage signal. Since the MOS transistor has the characteristic of a linear resistor only in a specified voltage range, the control module 30 converts the current signal output by the photoelectric conversion element 110 into a specific voltage range, and the current signal is converted into the specific voltage range according to a corresponding ratio, so as to ensure that the resistance of the MOS transistor is related to the current output by the photoelectric conversion element 110.
As shown in fig. 2, describing an embodiment of the present invention, the signal acquirer 10 is implemented as a current acquisition module including a first auxiliary circuit L1, a second auxiliary circuit L2, and a current acquisition circuit L3. The first auxiliary circuit L1 is electrically connected to the photoelectric conversion element 110, the second auxiliary circuit L2 is electrically connected to the first auxiliary circuit L1, the current collection circuit L3 is electrically connected to the second auxiliary circuit L2, and a node of the photoelectric conversion element 110 electrically connected to the first auxiliary circuit L1 is the same as a node of the current collection circuit L3 electrically connected to the second auxiliary circuit L2, the first auxiliary circuit L1 collects a current in the photoelectric conversion element 110, and a current in the second auxiliary circuit L2 is the same as a current in the first auxiliary circuit L1, and then the current collection circuit L3 collects a current in the replica circuit L2, and since the photoelectric conversion element 110 is electrically connected to a node of the first auxiliary circuit L1 and the current collection circuit L3 is electrically connected to a node of the second auxiliary circuit L2, the current collection circuit L3 can collect a current of the photoelectric conversion element 110.
According to the above embodiment, the current collection circuit L3 is provided with a reaction resistor R2, and the reaction resistor R2 is electrically connected to the MOS transistor. When different currents flow through the reaction resistor R2, the voltage of the reaction resistor R2 also changes correspondingly, and since the MOS transistor is electrically connected to the reaction resistor R2, the resistance value of the MOS transistor can change correspondingly with the voltage of the reaction resistor R2, so that the resistance value of the MOS transistor changes correspondingly with the current output by the photoelectric conversion element 110.
The first auxiliary circuit L1, the second auxiliary circuit L2 and the current acquisition circuit L3 are embodied as five current mirrors, two resistors and two supply voltages. A supply voltage VDD, a first resistor R0, first and third current mirrors M0 and M2, and a bias voltage V bias A first resistor R0 electrically connected to the photoelectric conversion element 110, a second resistor R1, a second current mirror M1 and a fourth current mirror M3 electrically connected in series to the power supply voltage VDD and the bias voltage V bias After the second auxiliary circuit L2 is formed, the fifth current mirror M4 and the reaction resistor R2 are connected in series, and then electrically connected to the second resistor R1, so as to form the current collecting circuit L. The purpose of collecting the current of the photoelectric conversion element 110 is achieved by the first auxiliary circuit L1, the second auxiliary circuit L2, and the current collecting circuit L3. The current of the photoelectric conversion element 110 can be stably collected by adopting five current mirrors, two resistors and two power supply voltages, and the structure is simple and stable.
A transimpedance amplifier according to a preferred embodiment of the present invention having a wide input range will be described in detail below. The transimpedance amplifier with a wide input range includes a photoelectric conversion element 110, a signal amplifier 120, and a control circuit of the transimpedance amplifier, which includes a signal acquirer 10, a resistance adjustable module 20, and a control module 30. The influence of stray inductance of the circuit on the electric signal can be reduced by adopting the regulating and controlling circuit, and the eye pattern quality of the output signal of the trans-impedance amplifier is improved.
The method for reducing the influence of stray inductance on the circuit according to a preferred embodiment of the present invention will be described in detail below. The method for reducing the influence of stray inductance on the circuit comprises the following steps:
step S1, acquiring an electrical signal in the signal transmission circuit 100; and
and step S2, correspondingly increasing or decreasing the resistance value of the resistance value adjustable module 20 according to the magnitude of the electric signal obtained in the step S1.
Preferably, in the step S1, the electrical signal in the signal transmission circuit 100 is obtained as a current signal of the photoelectric conversion element 110, and the current signal is converted into a voltage signal, and in the step S2, the resistance value of the resistance value adjustable module 20 is correspondingly changed according to the voltage signal.
When the current signal in the photoelectric conversion element 110 is detected to be smaller, the resistance value of the resistance value adjustable module 20 is correspondingly reduced, the influence of stray inductance on the smaller current is reduced, it is ensured that the signal transmission circuit 100 can stably convert the smaller current into the corresponding voltage signal, it is ensured that the signal transmission circuit 100 can completely output the smaller electric signal, and the eye diagram quality of the signal transmission circuit 100 outputting the smaller current signal is improved. If the current signal of the photoelectric conversion element 110 is detected to be larger, the resistance value of the resistance value adjustable module 20 is correspondingly improved, the influence of stray inductance on larger current is reduced, it is ensured that the signal transmission circuit 100 can stably convert larger current into corresponding voltage signal, it is ensured that the signal transmission circuit 100 can completely output larger electric signal, and the eye diagram quality of the signal transmission circuit 100 outputting larger current signal is improved.
Preferably, the electrical signal in the signal transmission circuit 100 is acquired in the step S1 as a voltage signal output by the signal amplifier 120.
Correspondingly, the resistance value of the resistance value adjustable module 20 is correspondingly changed according to the magnitude of the voltage signal output by the signal amplifier 120, so as to reduce the influence of stray inductance in the circuit on the electric signal output by the signal amplifier 120.
As shown IN fig. 4, as a simulation result of a preferred embodiment of the regulating circuit of the transimpedance amplifier of the present invention, the PD input current signal ID, IN is 2.7mA;
as shown IN fig. 5, for the simulation results without eliminating the effect of the stray inductance, the PD inputs the current signal ID, IN of 2.7mA.
As shown IN fig. 6, a simulation result of a preferred embodiment provided for the regulating circuit of the transimpedance amplifier according to the present invention is that the PD input current signal ID, IN is 70uA;
as shown IN fig. 7, for the simulation result without eliminating the influence of the stray inductance, the PD input current signal ID, IN is 70uA.
As shown in fig. 6 and 7, when a small signal is input to the transimpedance amplifier, the output eye pattern quality of the transimpedance amplifier is almost the same. However, when a large signal is input into the transimpedance amplifier, the comparison of the output eye patterns is obvious, and the regulating circuit provided by the invention has obvious improvement effect.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (10)
1. A regulating circuit of a transimpedance amplifier, wherein the regulating circuit of the transimpedance amplifier is electrically connected to a signal transmission circuit, the signal transmission circuit comprises a photoelectric conversion element and a signal amplifier, the photoelectric conversion element is electrically connected to the signal amplifier, and the wide input range transimpedance amplifier comprises:
the signal acquirer is electrically connected with the signal transmission circuit and can acquire the electric signals transmitted in the signal transmission circuit;
the resistance value adjustable module is connected between the photoelectric conversion element and the signal amplifier in series;
the control module is electrically connected with the signal acquirer and the resistance adjustable module, transmits the electric signal acquired by the signal acquirer to the resistance adjustable module, and enables the resistance of the resistance adjustable module to be correspondingly changed according to the received electric signal.
2. The regulating circuit of the transimpedance amplifier according to claim 1, wherein the signal extractor is configured to extract a voltage signal output from the signal amplifier.
3. The regulating circuit of the transimpedance amplifier according to claim 2, wherein the signal extractor is implemented as a peak detection circuit, the peak detection circuit being electrically connected to the output of the signal amplifier.
4. The regulating circuit of the transimpedance amplifier according to claim 3, wherein the resistance adjustable module is implemented as a MOS transistor, and the MOS transistor is electrically connected to the peak detection circuit, so that the peak detection circuit inputs a voltage to the MOS transistor.
5. The regulating circuit of the transimpedance amplifier according to claim 3, wherein the resistance adjustable module is implemented to include a resistor string and a plurality of switch arrays, the plurality of switch arrays are electrically connected to the resistor string, the control module is electrically connected to the switch arrays, and the control module changes the closing of the switch arrays according to the electrical signal of the signal acquirer, so as to change the resistance of the resistor string.
6. The regulating circuit of the transimpedance amplifier according to claim 1, wherein the signal extractor is configured to extract a current signal output from the photoelectric conversion element.
7. The regulating circuit of the transimpedance amplifier according to claim 6, wherein the resistance control module is configured as a resistor string and a plurality of switch arrays, the plurality of switch arrays are electrically connected to the resistor string, the control module is electrically connected to the switch arrays, and the control module changes the closing of the switch arrays according to the electrical signal of the signal acquirer, so as to change the resistance of the resistor string.
8. The regulating circuit of the transimpedance amplifier according to claim 6, wherein the electrical signal extractor is implemented as a current collection module, the current collection module comprises a first auxiliary circuit, a second auxiliary circuit, and a current collection circuit, the first auxiliary circuit is electrically connected to the photoelectric conversion element, the second auxiliary circuit is electrically connected to the first auxiliary circuit, the current collection circuit is electrically connected to the second auxiliary circuit, and the photoelectric conversion element is electrically connected to a node of the first auxiliary circuit and a node of the second auxiliary circuit.
9. A method for reducing the effect of stray inductance on a circuit, comprising the steps of,
step S1, acquiring an electric signal in a signal transmission circuit; and
and S2, correspondingly increasing or decreasing the resistance value of the resistance value adjustable module according to the magnitude of the electric signal obtained in the step S1.
10. The method of claim 9, wherein the step S1 is performed by obtaining a current signal in the signal transmission circuit and correspondingly converting the current signal into a voltage signal.
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