CN208158551U - Trans-impedance amplifier and optical line terminal - Google Patents
Trans-impedance amplifier and optical line terminal Download PDFInfo
- Publication number
- CN208158551U CN208158551U CN201820806249.5U CN201820806249U CN208158551U CN 208158551 U CN208158551 U CN 208158551U CN 201820806249 U CN201820806249 U CN 201820806249U CN 208158551 U CN208158551 U CN 208158551U
- Authority
- CN
- China
- Prior art keywords
- trans
- port
- impedance amplifier
- mentioned
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
This application discloses a kind of trans-impedance amplifier and optical line terminals, including：Vent diverter, AGC Control, operational amplifier, feed circuit, offset injection element, direct current recovery controller and sensor circuit.The control signal that vent diverter is exported according to AGC Control shunts away the input current of trans-impedance amplifier from feed circuit.The AGC Control generates control signal according to the peak-to-peak value and reference voltage of the output voltage of the trans-impedance amplifier.The DC component or low frequency component of direct current recovery controller detection trans-impedance amplifier output voltage, by the DC component DC component or low frequency component that perhaps low frequency component is fed to output voltage of the first port of above-mentioned operational amplifier for controlling above-mentioned trans-impedance amplifier by deviating injection element.Sensor circuit detects the average current of the input current of trans-impedance amplifier, passes through the gain of Average Current Control operational amplifier.The good control precision of amplitude is provided using the trans-impedance amplifier of the embodiment of the present application.
Description
Technical field
This application involves electronic technology field more particularly to a kind of trans-impedance amplifiers and optical line terminal.
Background technique
In circuit design, trans-impedance amplifier is a kind of common circuit.In order to avoid it is when input signal is very big
The distortion of the saturation and output signal of automatic growth control (Automatic Gain Control, AGC) mode, usually controls
The gain of trans-impedance amplifier.
In the prior art, the method for controlling the gain of trans-impedance amplifier is the feedback that setting includes one or more transistors
Path, or shunting device is placed in the input terminal of trans-impedance amplifier.The latter is to have in terms of the stability of trans-impedance amplifier
Advantage.For the latter, diverter element includes resistor, diode, double pole triode and MOS type
Triode.
But the AGC scheme proposed in the prior art depends critically upon transistor parameter, but the parameter and technique of transistor
It is temperature dependent, thus trans-impedance amplifier can not provide the good control precision of amplitude in the case where flow-route and temperature variation.
Utility model content
The embodiment of the present application provides a kind of trans-impedance amplifier and optical line terminal, can provide the good control essence of amplitude
Degree.
In a first aspect, the embodiment of the present application provides a kind of trans-impedance amplifier, including：Vent diverter, automatic growth control AGC
Controller, operational amplifier, feed circuit, offset injection element, direct current recovery controller and sensor circuit；
The first port of the vent diverter, the offset first port of injection element, the operational amplifier the
Single port, the feed circuit second port be connected with the input port of the trans-impedance amplifier；The operation amplifier
The second port of device, the first port of the feed circuit, the input port of the AGC Control and the direct current restore control
The first port of device is connected with the output port of the trans-impedance amplifier；The output port of the AGC Control with it is described
The third port of vent diverter is connected；The second port point of the second port of the vent diverter and the offset injection element
It is not connected with the first input port of the sensor circuit and the second input port；The output port of the sensor circuit and institute
The third port for stating operational amplifier is connected, the second port of the direct current recovery controller and the offset injection element
Third port is connected；
The vent diverter, the control signal for being inputted according to the AGC Control, by the defeated of the trans-impedance amplifier
Enter electric current to shunt away from the feed circuit, to reduce the gain of the trans-impedance amplifier；Wherein, the magnitude of current being split
It is directly proportional to the control signal；
The AGC control circuit, for generating the control signal according to the characteristic of the trans-impedance amplifier output voltage,
The characteristic of the trans-impedance amplifier output voltage is the peak-to-peak value of trans-impedance amplifier output voltage；
The sensor circuit, the average current of the input current for detecting the trans-impedance amplifier, by described average
The gain of operational amplifier described in current control；The average current is the electric current and shunting member of the offset injection element
The difference of electric current in part, the gain of the operational amplifier are inversely proportional with the average current；
The direct current recovery controller, for detecting the DC component or low frequency of the output voltage of the trans-impedance amplifier
Component, in the form of electric current by the offset injection element by the DC component of the output voltage or the low frequency component
The input port of the trans-impedance amplifier is injected, to control the DC component or low frequency of the output voltage of the trans-impedance amplifier
Component.
In a kind of feasible embodiment, the vent diverter is bipolar junction transistor, the hair of the bipolar junction transistor
Emitter-base bandgap grading, collector and base stage respectively correspond the first port of the vent diverter, second port and third port.
In a kind of feasible embodiment, the emitter of the bipolar junction transistor is connected by one or more resistance
To the input port of the trans-impedance amplifier.
In a kind of feasible embodiment, the AGC Control includes for detecting the trans-impedance amplifier output voltage
Peak-to-peak value peak detection circuit and reference voltage generating circuit for generating reference voltage；
The AGC Control generates institute according to the peak-to-peak value of the trans-impedance amplifier output voltage and the reference voltage
State control signal.
In a kind of feasible embodiment, the sensor circuit includes for detecting electric current and institute in the vent diverter
The circuit of the electric current of offset injection element and the conversion circuit for the average current to be converted to average voltage are stated, it is described flat
Equal electric current is the difference of the electric current of the offset injection element and the electric current of the vent diverter.
In a kind of feasible embodiment, the conversion circuit includes one or more comparators or one or more
Linear amplifier.
In a kind of feasible embodiment, the direct current recovery controller is integrator circuit.
Second aspect, the embodiment of the present application also provide a kind of optical line terminal, including putting across resistance as described in relation to the first aspect
Big device.
As can be seen that the trans-impedance amplifier in embodiments herein includes vent diverter, AGC Control, operation amplifier
Device, feed circuit, offset injection element, direct current recovery controller and sensor circuit.Vent diverter is inputted according to AGC Control
Control signal shunts away the input current of trans-impedance amplifier from feed circuit, to reduce the increasing of the trans-impedance amplifier
Benefit；The magnitude of current being split vent diverter directly proportional to control signal.The AGC Control detects the output electricity of the trans-impedance amplifier
The peak-to-peak value and generation reference voltage of pressure, generate control signal according to the peak-to-peak value of the output voltage and reference voltage.Direct current
Perhaps low frequency component divides the DC component or low frequency to the DC component of recovery controller detection trans-impedance amplifier output voltage
The first port that amount is fed to above-mentioned operational amplifier by deviating injection element, for controlling the output of above-mentioned trans-impedance amplifier
The DC component or low frequency component of voltage.Sensor circuit detects the average current of the input current of trans-impedance amplifier, by flat
The gain of equal current control operational amplifier；The average current is the difference of electric current in the electric current and vent diverter for deviate injection element
Value, gain and the average current of operational amplifier are inversely proportional.The good of amplitude is provided using the trans-impedance amplifier of the embodiment of the present application
Control precision well.
These aspects or other aspects of the application can more straightforward in the following description.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of trans-impedance amplifier provided by the embodiments of the present application；
Fig. 2 is a kind of detection circuit structural representation that average current is detected using sensor circuit provided by the embodiments of the present application
Figure.
Specific embodiment
It is described in detail separately below.
Referring to Fig. 1, Fig. 1 is a kind of structural schematic diagram of trans-impedance amplifier provided by the embodiments of the present application.As shown in Figure 1,
The trans-impedance amplifier includes：Vent diverter 101, AGC Control 102, operational amplifier 103, feed circuit 104, offset injection
Element 105, sensor circuit 106 and direct current recovery controller 107.
Wherein, the first port of above-mentioned shunting device 101, the first port for deviating injection element 105, operational amplifier
103 first port and the second port of feed circuit 104 are connected with the input port of above-mentioned trans-impedance amplifier；
The second port of above-mentioned shunting device 101 and the second port of above-mentioned offset injection element 105 respectively with it is above-mentioned
The first input port of sensor circuit 107 is connected with the second input port；The output port of the sensor circuit 107 with it is above-mentioned
The third port of operational amplifier 103 is connected, the input terminal of the second port of the operational amplifier 103, AGC Control 102
Output of the first port of mouth, the first port of feed circuit 104 and direct current recovery controller 106 with above-mentioned trans-impedance amplifier
Port is connected；The output port of above-mentioned AGC Control is connected with the third port of above-mentioned vent diverter；Above-mentioned direct current restores
The second port of controller 106 is connected with the third port of above-mentioned offset injection element 105.
In a kind of feasible embodiment, the input port of above-mentioned trans-impedance amplifier connects the output port of photodiode,
The photodiode converts optical signals to current signal, which is fed to the input port of above-mentioned trans-impedance amplifier.
Wherein, above-mentioned feed circuit 104 includes at least one resistance or at least one transistor.The feed circuit can be with
Regard the feedback path of above-mentioned trans-impedance amplifier as.
Above-mentioned vent diverter 101, for according to control signal by a part of the input current of the trans-impedance amplifier from this
It is shunted away in the feedback path of trans-impedance amplifier, the magnitude of current being split is with above-mentioned control signal (voltage signal) at just
Than.
In a kind of feasible embodiment, above-mentioned vent diverter 101 includes a bipolar junction transistor, the hair of the transistor
Emitter-base bandgap grading, collector and base stage respectively correspond first port, second port and the third port of above-mentioned vent diverter 101.The crystal
The emitter of pipe directs or through the input port that one or more resistance is connected to above-mentioned trans-impedance amplifier.The transistor
Base stage connect the second port of above-mentioned AGC Control 102, receive the control signal exported from AGC Control 102.
Above-mentioned AGC Control 102, the characteristic for the output voltage according to above-mentioned trans-impedance amplifier generate above-mentioned control letter
Number, and exported by its output port to the third port of above-mentioned vent diverter.
Wherein, the characteristic of the output voltage of above-mentioned trans-impedance amplifier is the peak-to-peak value of the output voltage.
In a kind of preferred embodiment, above-mentioned AGC Control 102 includes that electricity occurs for peak detection circuit and reference voltage
Road.Above-mentioned peak detection circuit is used to detect the peak-to-peak value of the output voltage of above-mentioned trans-impedance amplifier, and above-mentioned reference voltage occurs
Circuit, for generating reference voltage.Above-mentioned AGC Control 102 according to the peak-to-peak value of the output voltage of above-mentioned trans-impedance amplifier and
Reference voltage generates above-mentioned control signal.
Wherein, above-mentioned sensor circuit 107, electric current and offset for being exported according to above-mentioned 101 second port of vent diverter
The electric current of the second port output of injection element 105 obtains the average current of above-mentioned trans-impedance amplifier input current.
The gain of above-mentioned average current and above-mentioned operational amplifier is inversely proportional.When the increase of average current, above-mentioned operation
The gain of amplifier reduces, so that the gain of entire trans-impedance amplifier reduces.It is above-mentioned known to analog circuit knowledge to amplify across resistance
The equivalent input impedance of device is F/ (1+A*F), and wherein A is the gain of operational amplifier, and F is the equivalent impedance of feed circuit.When
When the gain reduction of above-mentioned trans-impedance amplifier, then the equivalent input impedance of the trans-impedance amplifier increases.By above-mentioned trans-impedance amplifier
Equivalent input impedance increase, this means that vent diverter only needs that same gain can be reached using less electric current
Effect.That is the size of vent diverter can be smaller, and power consumption can be lower, simultaneously because the parasitic capacitance of vent diverter becomes
Small, the bandwidth of trans-impedance amplifier is improved.
Further, above-mentioned sensor circuit includes the circuit for detecting the electric current flowed in above-mentioned vent diverter and detection
Electric current in the offset injection element, is subtracted the electricity in above-mentioned vent diverter by the circuit of electric current in above-mentioned offset injection element
Stream, to obtain above-mentioned average current.The average current is fed to one or more comparators or one in above-mentioned sensor circuit
A or multiple linear amplifiers or general controller obtain control voltage, the control voltage supply to above-mentioned operational amplifier
Third port, to control the gain of above-mentioned operational amplifier.The gain of the operational amplifier is inversely proportional with above-mentioned control voltage.
Above-mentioned direct current recovery controller, for detecting the DC component or low frequency of the output voltage of above-mentioned trans-impedance amplifier
Component, and the DC component of the output voltage or low frequency component are input to above-mentioned offset injection element.
Wherein, above-mentioned direct current recovery controller can be integrator circuit.
Above-mentioned offset injection element, for being put according to the DC component or low frequency component of above-mentioned output voltage in above-mentioned operation
The first port Injection Current of big device, to control the DC component or low frequency component of above-mentioned trans-impedance amplifier output voltage.
Further, above-mentioned offset injection element also provides bias current for above-mentioned vent diverter.
Wherein, above-mentioned offset injection element includes one or more transistors or resistance.
In a kind of feasible embodiment, above-mentioned sensor circuit obtains above-mentioned average electricity by way of current mirror
Stream.Referring to fig. 2, Fig. 2 is a kind of detection circuit structure that average current is detected using sensor circuit provided by the embodiments of the present application
Schematic diagram.As shown in Fig. 2, the detection circuit include transistor M1, transistor M2, transistor M3, transistor M4, transistor M5,
Transistor M6, triode Q and DC voltage source VCC.
Wherein, the source electrode of above-mentioned transistor M1 connects above-mentioned DC voltage source VCC, the grid of grid and above-mentioned transistor M2
It is connected, the drain electrode of above-mentioned transistor M1 is the port 1 of above-mentioned detection circuit.The source electrode of above-mentioned transistor M2 connects above-mentioned direct current
Potential source VCC, and drain electrode is connected with grid.
The source electrode of above-mentioned transistor M3 meets above-mentioned DC voltage source VCC, and grid is connected with the grid of above-mentioned transistor M4
It connects, the drain electrode of above-mentioned transistor M3 is connected with the drain electrode of above-mentioned transistor M2.The source electrode of above-mentioned transistor M4 connects above-mentioned direct current
Voltage source VCC, and the drain electrode of transistor M4 is connected with its grid.
The collector of above-mentioned triode Q is connected with the drain electrode of above-mentioned transistor M1, and the base stage of triode Q is above-mentioned inspection
The port 2 of slowdown monitoring circuit, triode Q emit the port 4. of extremely above-mentioned detection circuit
The drain electrode of above-mentioned transistor M5 is connected with the drain electrode of above-mentioned transistor M3, the drain electrode of transistor M6 and above-mentioned three pole
The transmitter of pipe is connected, the source electrode of transistor M5 and the source grounding of transistor M6；The grid and transistor of transistor M5
The grid of M6 is connected, and the grid of the grid of transistor M5 or transistor M6 are the port 3 of above-mentioned detection circuit.
The port 2 of above-mentioned detection circuit is connected with the output port of AGC Control shown in Fig. 1, the detection circuit
Port 3 be connected with the second port of direct current recovery controller shown in Fig. 1, in the port 4 of above-mentioned detection circuit and Fig. 1
Shown in the first port of operational amplifier be connected.
Wherein, above-mentioned DC voltage source VCC, transistor M1 and M2 composition subtraction reflecting mirror, above-mentioned DC voltage source VCC,
Transistor M3 and M4 constitute vent diverter reflecting mirror, and above-mentioned transistor M5 and M6 constitute offset injection element reflecting mirror.
Wherein, above-mentioned triode is vent diverter shown in Fig. 1, and transistor M6 is offset injection member shown in Fig. 1
Part, according in Fig. 1 to the associated description of sensor circuit it is found that above-mentioned port 4 export electric current be above-mentioned average current.By shunting
The working principle of element reflecting mirror and offset injection element reflecting mirror is it is found that the drain electrode of above-mentioned transistor M3 and the leakage of transistor M5
The electric current of extremely connected contact is equal to above-mentioned average current；Due to the drain electrode of transistor M3 be connected with the drain electrode of transistor M5 contact with
The drain electrode of above-mentioned transistor M2 is connected, according to subtraction reflecting mirror working principle it is found that the output of the port 4 of above-mentioned detection circuit
Drain electrode of the electric current equal to transistor M3 is connected the electric current (i.e. above-mentioned average current) of contact with the drain electrode of transistor M5.Detection electricity
The output electric current of the port 4 on road be directly fed to or by one or more comparators or one or more linear amplifiers,
Or general controller is fed to the third port of above-mentioned operational amplifier, to control the gain of the operational amplifier, and then controls
Make the gain of above-mentioned trans-impedance amplifier.
Wherein, above-mentioned transistor M1, M2, M3 and M4 are N-type transistor, and transistor M5 and M6 are P-type transistor.
In a kind of feasible embodiment, the gain of above-mentioned operational amplifier depends on its input current and used negative
It carries.The average current that above-mentioned sensor circuit detects is used to control the gain and/or its load of above-mentioned operational amplifier.
As can be seen that in embodiments herein, vent diverter, AGC Control, operational amplifier, feed circuit, partially
Move injection element, direct current recovery controller and sensor circuit.The control signal that vent diverter is inputted according to AGC Control will be across resistance
The input current of amplifier shunts away from feed circuit, to reduce the gain of the trans-impedance amplifier；The electric current being split
Amount vent diverter directly proportional to control signal.The AGC controller detect the output voltage of the trans-impedance amplifier peak-to-peak value and
Reference voltage is generated, control signal is generated according to the peak-to-peak value of the output voltage and reference voltage.The detection of direct current recovery controller
Perhaps low frequency component injects the DC component or low frequency component by offset to the DC component of trans-impedance amplifier output voltage
Element is fed to the first port of above-mentioned operational amplifier, the DC component of the output voltage for controlling above-mentioned trans-impedance amplifier
Or low frequency component.Sensor circuit detects the average current of the input current of trans-impedance amplifier, passes through Average Current Control operation
The gain of amplifier；The average current is the difference of electric current in the electric current and vent diverter for deviate injection element, operational amplifier
Gain be inversely proportional with average current.The good control precision of amplitude is provided using the trans-impedance amplifier of the embodiment of the present application.
The embodiment of the present application also provides a kind of optical line terminal, which includes as shown in Figure 1 across resistance amplification
Device.
The embodiment of the present application is described in detail above, specific case used herein to the principle of the application and
Embodiment is expounded, the description of the example is only used to help understand the method for the present application and its core ideas；
At the same time, for those skilled in the art can in specific embodiments and applications according to the thought of the application
There is change place, in conclusion the contents of this specification should not be construed as limiting the present application.
Claims (8)
1. a kind of trans-impedance amplifier, which is characterized in that including：Vent diverter, automatic growth control AGC Control, operation amplifier
Device, feed circuit, offset injection element, direct current recovery controller and sensor circuit；
First port, the first end of the operational amplifier of the first port of the vent diverter, the offset injection element
Mouthful, the second port of the feed circuit is connected with the input port of the trans-impedance amplifier；The operational amplifier
Second port, the first port of the feed circuit, the input port of the AGC Control and the direct current recovery controller
First port is connected with the output port of the trans-impedance amplifier；The output port of the AGC Control and the shunting
The third port of element is connected；The second port of the vent diverter and it is described offset injection element second port respectively with
The first input port of the sensor circuit is connected with the second input port；The output port of the sensor circuit and the fortune
The third port for calculating amplifier is connected, the third of the second port of the direct current recovery controller and the offset injection element
Port is connected；
The vent diverter, the control signal for being inputted according to the AGC Control, by the input electricity of the trans-impedance amplifier
Stream shunts away from the feed circuit, to reduce the gain of the trans-impedance amplifier；Wherein, the magnitude of current being split and institute
It is directly proportional to state control signal；
The AGC control circuit, it is described for generating the control signal according to the characteristic of the trans-impedance amplifier output voltage
The characteristic of trans-impedance amplifier output voltage is the peak-to-peak value of trans-impedance amplifier output voltage；
The sensor circuit, the average current of the input current for detecting the trans-impedance amplifier, passes through the average current
Control the gain of the operational amplifier；The average current is in the electric current and the vent diverter of the offset injection element
The difference of electric current, the gain of the operational amplifier are inversely proportional with the average current；
The direct current recovery controller, for detecting the DC component or low frequency point of the output voltage of the trans-impedance amplifier
Amount infuses the DC component of the output voltage or the low frequency component by the offset injection element in the form of electric current
Enter the input port of the trans-impedance amplifier, to control the DC component or low frequency point of the output voltage of the trans-impedance amplifier
Amount.
2. trans-impedance amplifier according to claim 1, which is characterized in that the vent diverter is bipolar junction transistor, institute
The emitter, collector and base stage for stating bipolar junction transistor respectively correspond the first port of the vent diverter, second port and
Third port.
3. trans-impedance amplifier according to claim 2, which is characterized in that the emitter of the bipolar junction transistor passes through one
A or multiple resistance are connected to the input port of the trans-impedance amplifier.
4. trans-impedance amplifier according to claim 1-3, which is characterized in that the AGC Control includes being used for
Detect the peak detection circuit of the peak-to-peak value of the trans-impedance amplifier output voltage and the reference voltage for generating reference voltage
Circuit occurs；
The AGC Control generates the control according to the peak-to-peak value of the trans-impedance amplifier output voltage and the reference voltage
Signal processed.
5. trans-impedance amplifier according to claim 4, which is characterized in that the sensor circuit includes for detecting described point
The circuit of the electric current of electric current in fluid element and the offset injection element and for the average current to be converted to average electricity
The conversion circuit of pressure, the average current are the difference of the electric current of the offset injection element and the electric current of the vent diverter.
6. according to trans-impedance amplifier according to claim 5, which is characterized in that the conversion circuit includes one or more
Comparator or one or more linear amplifiers.
7. trans-impedance amplifier according to claim 6, which is characterized in that the direct current recovery controller is integrator electricity
Road.
8. a kind of optical line terminal, which is characterized in that the optical line terminal include as claim 1-7 it is described in any item across
Impedance amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820806249.5U CN208158551U (en) | 2018-05-28 | 2018-05-28 | Trans-impedance amplifier and optical line terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820806249.5U CN208158551U (en) | 2018-05-28 | 2018-05-28 | Trans-impedance amplifier and optical line terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208158551U true CN208158551U (en) | 2018-11-27 |
Family
ID=64388614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820806249.5U Active CN208158551U (en) | 2018-05-28 | 2018-05-28 | Trans-impedance amplifier and optical line terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208158551U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545083A (en) * | 2018-05-28 | 2019-12-06 | 深圳市芯波微电子有限公司 | Trans-impedance amplifier |
| CN111327282A (en) * | 2018-12-17 | 2020-06-23 | 深圳市中兴微电子技术有限公司 | Control circuit, transimpedance amplification circuit and control method |
-
2018
- 2018-05-28 CN CN201820806249.5U patent/CN208158551U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545083A (en) * | 2018-05-28 | 2019-12-06 | 深圳市芯波微电子有限公司 | Trans-impedance amplifier |
| CN111327282A (en) * | 2018-12-17 | 2020-06-23 | 深圳市中兴微电子技术有限公司 | Control circuit, transimpedance amplification circuit and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6011273B2 (en) | amplifier | |
| JP5861363B2 (en) | Amplifier | |
| US11394349B2 (en) | Transimpedance amplifier | |
| JP6038165B2 (en) | Receiver and receiving method | |
| CN208158551U (en) | Trans-impedance amplifier and optical line terminal | |
| CN107045374B (en) | Power amplification circuit | |
| CN209787128U (en) | Transimpedance amplifier and transimpedance amplifier circuit | |
| KR20150018762A (en) | Device for detecting pulsed electromagnetic radiation | |
| CN103458341A (en) | Audio frequency amplifier adjunct circuit used for eliminating emitter output stage | |
| CN202757983U (en) | Current detection circuit and USB interface circuit | |
| CN103973241B (en) | It is dynamically adapted the power amplification circuit of gain | |
| CN202713135U (en) | Automobile navigator power supply filter circuit | |
| CN209803582U (en) | Intelligent switch socket control system | |
| CN112485494A (en) | Current detection circuit based on triode | |
| US9899964B2 (en) | Class AB amplifier with bias control | |
| CN103138704B (en) | It is suitable for the voltage control variable resistor of big scale signal application | |
| CN106342289B (en) | Avalanche photodiodes bias voltage control circuit | |
| CN107645280A (en) | High speed amplifying circuit | |
| US20100028023A1 (en) | Optical receiver | |
| CN110545083A (en) | Trans-impedance amplifier | |
| CN104113294A (en) | Voltage controlled amplifier and method of using the same | |
| CN218301232U (en) | Power supply and detection circuit of two-wire system IEPE interface | |
| JP2011171812A (en) | Optical receiver | |
| KR102228958B1 (en) | A system and method for accumulating and measuring a slowly varying electrical charge | |
| CN216904868U (en) | Photosensitive device compensation circuit based on photosensitive current source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |