CN207490876U - A kind of zeroing high-gain differential amplifier circuit certainly - Google Patents
A kind of zeroing high-gain differential amplifier circuit certainly Download PDFInfo
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- CN207490876U CN207490876U CN201721598950.4U CN201721598950U CN207490876U CN 207490876 U CN207490876 U CN 207490876U CN 201721598950 U CN201721598950 U CN 201721598950U CN 207490876 U CN207490876 U CN 207490876U
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- amplifier circuit
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Abstract
The utility model discloses a kind of from zeroing high-gain differential amplifier circuit, including differential amplifier circuit, common-mode voltage biasing circuit and PWM filter circuits, the output terminal of common-mode voltage biasing circuit is electrically connected with differential amplifier circuit, and the input terminal of PWM filter circuits composition is electrically connected with the output terminal of differential amplifier circuit；From zeroing high-gain differential amplifier circuit offset voltage is intelligently adjusted in production or installation, without manually applying adjustment voltage for each differential amplifier circuit, reasonably simplify production procedure, in addition, it has been cancelled before circuit gain amplification from offset voltage existing for zeroing high-gain differential amplifier circuit, so that its low noise, strong antijamming capability are still maintained in the use occasion of high-gain from zeroing high-gain differential amplifier circuit.
Description
Technical field
It is particularly a kind of from zeroing high-gain differential amplifier circuit the utility model is related to a kind of differential amplifier circuit.
Background technology
In reality, the differential signal strong antijamming capability of differential amplifier circuit is usually arranged as high-gain difference and puts
Big circuit, in addition, differential signal is generally superimposed a big common-mode DC voltage or has been superimposed DC offset voltage, through excessively high
After gain amplification, but as signal noise, amplified signal is directly covered when serious；On the other hand, difference offset voltage is high
It must be solved the problems, such as in the amplifying circuit of gain, difference offset voltage is when sensor output zero, but output signal is not
Zero, during the electric bridge such as formed using thermistor and three conventional, electric-resistances, 3 resistance generate offset voltage there are error；Often
The method of solution offset voltage seen is to apply the offset voltage value of a reverse phase in low reference pin, offsets offset voltage, makes fortune
It is 0 to put the output of device, but method is there are two shortcomings in this, first, offset voltage is not a fixed amount, in mass production
When, need for each amplifying circuit apply adjustment voltage, working efficiency is low, second, offset voltage after plus and blowup,
It is likely to the maximum output voltage beyond transport and placing device.
Utility model content
For overcome the deficiencies in the prior art, a kind of circuit structure of the utility model offer is simple, production cost is low, anti-dry
Disturb the strong zeroing high-gain differential amplifier circuit certainly of ability.
Technical solution is used by the utility model solves its technical problem：
A kind of zeroing high-gain differential amplifier circuit certainly, is filtered including differential amplifier circuit, common-mode voltage biasing circuit and PWM
Wave circuit, the output terminal of the common-mode voltage biasing circuit are electrically connected with the differential amplifier circuit, the PWM filter circuits group
Into input terminal be electrically connected with the output terminal of the differential amplifier circuit.
The common-mode voltage biasing circuit includes voltage source U2, resistance R5, resistance R7, resistance R8, capacitance C2 and transport and placing device
U3；1 pin of the voltage source U2 connects 5V voltages by the resistance R5；2 pins of the voltage source U2 pass sequentially through described
Resistance R7, resistance R8 are grounded；The 3 pins ground connection of the voltage source U2；Two-way is divided in one end of the capacitance C2, connects the electricity all the way
The node between the R7 and resistance R8 is hindered, another way connects 2 pins of the transport and placing device U3, the other end ground connection of the capacitance C2；
1 pin of the transport and placing device U3 connects 3 pins of the transport and placing device U3；The 4 pins ground connection of the transport and placing device U3；The transport and placing device U3
8 pins connect 5V voltages.
The differential amplifier circuit includes instrument amplifier U1, resistance R1, resistance R2 and resistance R3；The instrument amplifier
The model AD8237 of U1；The 1 and 2 port of the instrument amplifier U1 is respectively connected to differential signal VIN- and VIN+；Institute
4 ports for stating instrument amplifier U1 connect 5V voltages；The 5 ports ground connection of the instrument amplifier U1；The 8 of the instrument amplifier U1
Two-way is divided in port, and all the way by the resistance R1 output signal VOUT, another way connects the instrument by the resistance R2 and amplifies
The FB ports of device U1；Two-way is divided in the REF ports of the instrument amplifier U1, and connecing the instrument by the resistance R3 all the way amplifies
Node between device U1 port FB and the resistance R2, another way are connect between the transport and placing device U3 pins 1 and the transport and placing device U3 pins 3
Node.
The PWM filter circuits include triode Q1, triode Q2, capacitance C1, resistance R4, resistance R6 and resistance R9；Institute
Two-way is divided in the B poles for stating triode Q1, connects 5V voltages by the resistance R4 all the way, and another way connects the B poles of the triode Q2；Institute
The C poles for stating triode Q1 connect 5V voltages；Two-way is divided in the E poles of the triode Q1, passes sequentially through the resistance R6 and resistance all the way
R9 connects the node between the resistance R2 and the resistance R3, and another way connects the E poles of the triode Q2；The C of the triode Q2
Two-way is divided in pole, connects node between the resistance R6 and the resistance R9, another way ground connection by the capacitance C1 all the way；Described three
Node input pwm signal between the B poles of pole pipe Q1 and the resistance R4.
The beneficial effects of the utility model are：The utility model include differential amplifier circuit, common-mode voltage biasing circuit and
PWM filter circuits, the output terminal of common-mode voltage biasing circuit are electrically connected with differential amplifier circuit, and PWM filter circuits form defeated
Enter end to be electrically connected with the output terminal of differential amplifier circuit；It is intelligently adjusted in production or installation from zeroing high-gain differential amplifier circuit
Offset voltage is saved, without being manually that each differential amplifier circuit applies adjustment voltage, reasonably simplified production procedure, in addition, from
Offset voltage has been cancelled before circuit gain amplification existing for zeroing high-gain differential amplifier circuit so that from high increase of returning to zero
Beneficial differential amplifier circuit still maintains its low noise, strong antijamming capability in the use occasion of high-gain.
Description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
It is a kind of from zeroing high-gain differential amplifier circuit with reference to Fig. 1, including differential amplifier circuit, common-mode voltage biased electrical
Road and PWM filter circuits, the output terminal of the common-mode voltage biasing circuit are electrically connected with the differential amplifier circuit, the PWM
The input terminal of filter circuit composition is electrically connected with the output terminal of the differential amplifier circuit.
The common-mode voltage biasing circuit includes voltage source U2, resistance R5, resistance R7, resistance R8, capacitance C2 and transport and placing device
U3；1 pin of the voltage source U2 connects 5V voltages by the resistance R5；2 pins of the voltage source U2 pass sequentially through described
Resistance R7, resistance R8 are grounded；The 3 pins ground connection of the voltage source U2；Two-way is divided in one end of the capacitance C2, connects the electricity all the way
The node between the R7 and resistance R8 is hindered, another way connects 2 pins of the transport and placing device U3, the other end ground connection of the capacitance C2；
1 pin of the transport and placing device U3 connects 3 pins of the transport and placing device U3；The 4 pins ground connection of the transport and placing device U3；The transport and placing device U3
8 pins connect 5V voltages；Resistance R5 and voltage source U2 series connection generates 2.5V reference voltage sources, and 2 pins for transport and placing device U3 carry
For 1.25V voltages；Transport and placing device U3 forms a voltage-tracing device, output voltage 1.25V, so the output of instrument amplifier U1
Voltage 1.25V containing DC common mode, resistance R7 and resistance R8 form potential-divider network, can adjust potential-divider network and realize common-mode voltage
Adjusting.
The PWM filter circuits include triode Q1, triode Q2, capacitance C1, resistance R4, resistance R6 and resistance R9；Institute
Two-way is divided in the B poles for stating triode Q1, connects 5V voltages by the resistance R4 all the way, and another way connects the B poles of the triode Q2；Institute
The C poles for stating triode Q1 connect 5V voltages；Two-way is divided in the E poles of the triode Q1, passes sequentially through the resistance R6 and resistance all the way
R9 connects the node between the resistance R2 and the resistance R3, and another way connects the E poles of the triode Q2；The C of the triode Q2
Two-way is divided in pole, connects node between the resistance R6 and the resistance R9, another way ground connection by the capacitance C1 all the way；Described three
Node input pwm signal between the B poles of pole pipe Q1 and the resistance R4；Node voltage between the resistance R9 and the resistance R6
For voltage Vs；PWM filter circuits are the circuits for generating voltage Vs；1 pin of triode Q1 is believed for receiving external control
Number, which can be PWM controls or common IO controls；Triode Q1 and triode Q2 composition push-pull configuration, resistance R6 and
Capacitance C1 forms passive low ventilating filter, and the square-wave signal of circuit transmission is made to be converted into direct current signal, adjusts the duty ratio of PWM wave
The voltage value of voltage Vs can be adjusted.
The differential amplifier circuit includes instrument amplifier U1, resistance R1, resistance R2 and resistance R3；The instrument amplifier
The model AD8237 of U1；The 1 and 2 port of the instrument amplifier U1 is respectively connected to differential signal VIN- and VIN+；Institute
4 ports for stating instrument amplifier U1 connect 5V voltages；The 5 ports ground connection of the instrument amplifier U1；The 8 of the instrument amplifier U1
Two-way is divided in port, and all the way by the resistance R1 output signal VOUT, another way connects the instrument by the resistance R2 and amplifies
The FB ports of device U1；Two-way is divided in the REF ports of the instrument amplifier U1, and connecing the instrument by the resistance R3 all the way amplifies
Node between device U1 port FB and the resistance R2, another way are connect between the transport and placing device U3 pins 1 and the transport and placing device U3 pins 3
Node.
1 pin and 2 pins of instrument amplifier U1 are the input interfaces of differential signal, and FB is feedback pin, and REF is setting
Reference voltage pin, indirect current feedback instrument amplifier transfer function are as follows：
VREF and Vs is as ideal voltage source, the transmission function of instrument amplifier U1：
Due to the common-mode voltage that VREF is setting, do not influence, can obtain on offsetting offset voltage：
Therefore, PWM filter circuits only need to generate in a suitable voltage Vs input difference amplifying circuit, can offset
Internal offset voltage realizes that intelligence is adjusted.
Offset voltage is intelligently adjusted in production or installation from zeroing high-gain differential amplifier circuit, without being manually each
Differential amplifier circuit applies adjustment voltage, reasonably simplifies production procedure, in addition, existing from zeroing high-gain differential amplifier circuit
Offset voltage circuit gain amplification before be cancelled so that from return to zero high-gain differential amplifier circuit make in high-gain
With occasion, its low noise, strong antijamming capability are still maintained.
Above embodiment cannot limit the protection domain of the invention, and the personnel of professional skill field are not departing from
In the case of the invention general idea, the impartial modification and variation done still fall within the range that the invention is covered
Within.
Claims (4)
- It is 1. a kind of from zeroing high-gain differential amplifier circuit, it is characterised in that the circuit includes differential amplifier circuit, common-mode voltage Biasing circuit and PWM filter circuits, the output terminal of the common-mode voltage biasing circuit are electrically connected with the differential amplifier circuit, institute The input terminal for stating PWM filter circuits composition is electrically connected with the output terminal of the differential amplifier circuit.
- It is 2. according to claim 1 from zeroing high-gain differential amplifier circuit, it is characterised in that the common-mode voltage biasing Circuit includes voltage source U2, resistance R5, resistance R7, resistance R8, capacitance C2 and transport and placing device U3；1 pin of the voltage source U2 leads to It crosses the resistance R5 and connects 5V voltages；2 pins of the voltage source U2 pass sequentially through the resistance R7, resistance R8 ground connection；The electricity The 3 pins ground connection of potential source U2；Two-way is divided in one end of the capacitance C2, connects the section between the resistance R7 and the resistance R8 all the way Point, another way connect 2 pins of the transport and placing device U3, the other end ground connection of the capacitance C2；1 pin of the transport and placing device U3 meets institute State 3 pins of transport and placing device U3；The 4 pins ground connection of the transport and placing device U3；8 pins of the transport and placing device U3 connect 5V voltages.
- It is 3. according to claim 2 from zeroing high-gain differential amplifier circuit, it is characterised in that the differential amplifier circuit Including instrument amplifier U1, resistance R1, resistance R2 and resistance R3；The model AD8237 of the instrument amplifier U1；The instrument The 1 and 2 port of table amplifier U1 is respectively connected to differential signal VIN- and VIN+；4 ports of the instrument amplifier U1 connect 5V voltages；The 5 ports ground connection of the instrument amplifier U1；Two-way is divided in 8 ports of the instrument amplifier U1, all the way by described Resistance R1 output signal VOUT, another way connect the FB ports of the instrument amplifier U1 by the resistance R2；The instrument is put Two-way is divided in the REF ports of big device U1, meets the instrument amplifier U1 ports FB and the resistance R2 by the resistance R3 all the way Between node, another way connects the node between the transport and placing device U3 pins 1 and the transport and placing device U3 pins 3.
- It is 4. according to claim 3 from zeroing high-gain differential amplifier circuit, it is characterised in that the PWM filter circuits packet Include triode Q1, triode Q2, capacitance C1, resistance R4, resistance R6 and resistance R9；Two-way is divided in the B poles of the triode Q1, all the way 5V voltages are connect by the resistance R4, another way connects the B poles of the triode Q2；The C poles of the triode Q1 connect 5V voltages；Institute Two-way is divided in the E poles for stating triode Q1, passes sequentially through the resistance R6 and resistance R9 all the way and meets the resistance R2 and the resistance R3 Between node, another way connects the E poles of the triode Q2；Two-way is divided in the C poles of the triode Q2, passes through the capacitance C1 all the way Connect the node between the resistance R6 and the resistance R9, another way ground connection；Between the B poles of the triode Q1 and the resistance R4 Node inputs pwm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721598950.4U CN207490876U (en) | 2017-11-27 | 2017-11-27 | A kind of zeroing high-gain differential amplifier circuit certainly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721598950.4U CN207490876U (en) | 2017-11-27 | 2017-11-27 | A kind of zeroing high-gain differential amplifier circuit certainly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207490876U true CN207490876U (en) | 2018-06-12 |
Family
ID=62471527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721598950.4U Active CN207490876U (en) | 2017-11-27 | 2017-11-27 | A kind of zeroing high-gain differential amplifier circuit certainly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207490876U (en) |
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2017
- 2017-11-27 CN CN201721598950.4U patent/CN207490876U/en active Active
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Address after: 528400 4th floor, building 1, Daling Industrial Zone, Torch Development Zone, Zhongshan City, Guangdong Province Patentee after: Guangdong ludes Environmental Technology Co.,Ltd. Address before: 528400 4th floor, building 1, Daling Industrial Zone, Torch Development Zone, Zhongshan City, Guangdong Province Patentee before: ZHONGSHAN LOTUSAIR Co.,Ltd. |