CN208635950U - A kind of instrument amplifier - Google Patents
A kind of instrument amplifier Download PDFInfo
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- CN208635950U CN208635950U CN201820610316.6U CN201820610316U CN208635950U CN 208635950 U CN208635950 U CN 208635950U CN 201820610316 U CN201820610316 U CN 201820610316U CN 208635950 U CN208635950 U CN 208635950U
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- 239000003990 capacitor Substances 0.000 claims abstract description 44
- 230000005611 electricity Effects 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000004088 simulation Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
The utility model relates to a kind of instrument amplifiers, including the first amplifier, the second amplifier, third amplifier and resistance, capacitor, constitute casacade multi-amplifier.It can be realized high-gain using lower valued resistor, reduce Resistance Thermal Noise；The amplifier for involving drift calibration function with low pass filtered by constituting third amplifier and adjustable resistance, capacitor, can be improved the measurement accuracy and anti-interference of signal value.
Description
Technical field
The utility model relates to instrument to detect correlative technology field, main to apply more particularly to a kind of instrument amplifier
Amplify in instrument signal.
Background technique
The main function of instrument amplifier is amplified difference signal, inhibits common-mode signal, improves signal-to-noise ratio, is high-precision
The common circuit module of signal acquiring system.The signal of signal acquiring system processing includes pressure sensor, temperature sensor etc.
The output small-signal of sensor and bioelectrical signals etc..The signal-to-noise ratio and anti-interference for how improving instrument amplifier, mention
The precision of high RST acquisition, while reducing instrument amplifier cost is instrument amplifier technological difficulties.
Summary of the invention
For the precision and anti-interference for improving signal measurement instrument signal measurement, a kind of instrument amplifier is proposed.
A kind of tension transmitter for pole wire tensile measurer, including the first amplifier, the second amplifier, third
Amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electricity
Appearance, the second capacitor, third capacitor, in which:
First amplifier, the second amplifier are in parallel, the first amplifier, the second amplifier input positive terminal be tension
The input terminal of sensor voltage output signal, the input negative pole end series connection first resistor of the first amplifier, the second amplifier, first
The input negative pole end of amplifier second resistance in parallel with output end, the input negative pole end of the second amplifier third in parallel with output end
Resistance, the output end of the first amplifier are connected the 4th resistance with the input positive terminal of third amplifier, the output of the second amplifier
End is connected the 5th resistance with the input negative pole end of third amplifier, and the input positive terminal of third amplifier with simulating connects the 6th
Resistance, the input negative pole end of third amplifier seventh resistance in parallel with output end；The input positive terminal of third amplifier and input
Negative pole end parallel connection first capacitor, the input positive terminal of third amplifier second capacitor in parallel with simulating, third amplifier it is defeated
Enter positive terminal third capacitor in parallel with simulating；
The power module is negative and positive dual power, and forward voltage output end and the first amplifier, second of power module are put
The forward voltage input terminal connection of big device, third amplifier, the negative voltage output end and the first amplifier, second of power module
The negative voltage input terminal connection of amplifier, third amplifier；
The input terminal of the voltage reference module and the forward voltage of power module connect, the output end of voltage reference module
It is connect with tension sensor；
The first resistor, the 6th resistance, the 7th resistance are the adjustable potentiometer of resistance value；Second resistance and 3rd resistor
Resistance value it is equal, the 4th resistance is equal with the resistance value of the 5th resistance, and the 6th resistance is equal with the resistance value of the 7th resistance；
Second capacitor (C2) is equal with third capacitor (C3) capacitance, described in first capacitor (C1) the capacitance ratio
Second capacitor (C2) capacitance is at least more than 10 times.
Preferably, the first amplifier, the second amplifier, the third amplifier are track to track output operational amplifier.
Preferably, the first amplifier, the second amplifier are LT6234, third amplifier is LT6233.
Preferably, tension transmitter is integrated in tension sensor simultaneously metal sealing.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model instrument amplifier
Fig. 2 the utility model power module and voltage reference module circuit diagram
In attached drawing, parts list represented by the reference numerals are as follows:
1. power module；2. voltage reference module；U1. the first amplifier；U2. the second amplifier；U3. third amplifier；
R1. first resistor；R2. second resistance；R3. 3rd resistor；R4. the 4th resistance；R5. the 5th resistance；R6. the 6th resistance；R7.
Seven resistance；C1. first capacitor；C2. the second capacitor；C3. third capacitor.
Specific embodiment
The utility model is described in more detail in the following with reference to the drawings and specific embodiments.
Fig. 1 is the circuit diagram of the utility model instrument amplifier, including the first amplifier U1, the second amplifier U2, third
Amplifier U3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
Seven resistance R7, first capacitor C1, the second capacitor C2, third capacitor C3；First amplifier U1, the second amplifier U2 are in parallel, the
One amplifier U1, the second amplifier U2 input positive terminal be the input terminal of signal transducer voltage output signal, first puts
The input negative pole end of the series connection of input negative pole end the first resistor R1, the first amplifier U1 of big device U1, the second amplifier U2 and output
Second resistance R2, the input negative pole end of the second amplifier 3rd resistor R3 in parallel with output end in parallel are held, the first amplifier U1's
Output end is connected the 4th resistance R4 with the input positive terminal of third amplifier U3, and the output end and third of the second amplifier U2 amplifies
The input negative pole end of device U3 is connected the 5th resistance R5, the input positive terminal of third amplifier U3 with simulating the 6th resistance of connecting
R6, the input negative pole end of third amplifier U3 seventh resistance R7 in parallel with output end；The input positive terminal of third amplifier U3 with
Input negative pole end parallel connection first capacitor C1, the input positive terminal of third amplifier U3 second capacitor C2 in parallel with simulating, third
The input positive terminal of amplifier U3 third capacitor C3 in parallel with simulating.
In the present embodiment, R2=R3, R4=R5, R6=R7, wherein R1, R6, R7 use the adjustable potentiometer of resistance value.
The then gain coefficient of transmitter are as follows:
There is phase at the both ends first resistor R1 to the common-mode voltage for being added to the first amplifier U1, the second amplifier U2 input terminal
Same current potential also flows through late-class circuit with regard to no current so that electric current will not be generated on first resistor R1.Therefore, common-mode signal
Will with unit gain by input buffer, and differential voltage signal by by gain coefficient be amplified, be equivalent to common mode inhibition
Than increasing (1+ (2 R2/R1)) times compared to traditional difference channel.The value for adjusting first resistor R1 can change transmitter
Gain coefficient, adjusting the 6th resistance R6, the 7th resistance R7 can make gain coefficient more accurate, to reduce operational amplifier
Drift.
First amplifier U1, the second amplifier U2, third amplifier U3 are track to track output operational amplifier.First puts
Big device U1, the second amplifier U2 are two-way track to track output operational amplifier LT6234, make the first amplifier U1, the second amplifier
U2 is integrated, and reduces device power consumption and thermal noise.Third amplifier U3 is single channel track to track output operational amplifier
LT6233.Second resistance R2 and first resistor R1 constitutes first order amplifier, and gain coefficient is (1+ (2 R2/R1)), the 6th electricity
R6 and the 4th resistance R4 composition second level amplifier, gain coefficient R6/R4 are hindered, when same magnification ratio can reduce each resistance
Value improves signal acquisition precision to reduce Resistance Thermal Noise.
Fig. 2 is the utility model power module and voltage reference module circuit diagram.Power module 1 is integrated switching mode electricity
Pressure converter A1205S module, 12 volts of input voltage, output voltage is positive and negative 5 volts, is powered for amplifier；Voltage reference module 2
For MAX6350, input voltage range is 8 volts ~ 36 volts, 5 volts of output voltage, power supply is provided for sensor, by using voltage base
Standard is the relatively traditional power supply power supply of sensor power supply, can substantially reduce power supply ripple noise to signal transducer output signal
Unstable influence improves signal transducer linearity of output signal and stability.Sensor output signal is millivolt level, and is supplied
Power supply is in a linear relationship, generally 2 millivolts/volt, although the amplifier used for low drift device, by temperature, circuit board
The influence of thermal noise still can generate drift after two-stage is amplified, and in the present embodiment, the 6th resistance R6, the 7th resistance R7 are adopted
With the adjustable potentiometer of resistance value, drift can be further eliminated by adjusting resistance value.
For filter out amplifier generation common-mode signal and power supply thermal noise interference, using first capacitor C1, the second capacitor C2,
Third capacitor C3, same to R6, R7 constitute filter, and first capacitor C1 is differential mode capacitor, the second capacitor C2, third capacitor C3 are common mode
Capacitor.
If R6=R7, C2=C3, then first capacitor C1, the second capacitor C2, third capacitor C3, the difference that same R6, R7 are constituted are filtered
Wave device, cutoff frequency are as follows:
Second capacitor C2, third capacitor C3, the common-mode filter that same R6, R7 are constituted respectively, cutoff frequency are as follows:
Generally make C1=C2=C3 in conventional method, make common mode inhibition smaller in this way, for faint direct current signal, for example opens
Power or temperature signal need to improve common-mode rejection ratio, eliminate as much as drift, while reduce the cutoff frequency of difference filter to filter
Except power supply thermal noise High-frequency Interference, therefore make differential mode capacitor value at least more than 10 times of common mode capacitance, if R6=R7=1K, C2=220pF,
C1=1uF。
Above embodiments describe more specific and detailed, and but it cannot be understood as to the utility model patent range
Limitation.It should be pointed out that for those of ordinary skill in the art, in the premise for not departing from the utility model design
Under, various modifications and improvements can be made, and these are all within the protection scope of the present invention.Therefore, the utility model is special
The scope of protection shall be subject to the appended claims for benefit.
Claims (4)
1. a kind of instrument amplifier, it is characterised in that: including the first amplifier, the second amplifier, third amplifier, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first capacitor, the second capacitor,
Three capacitors, power module and voltage reference module, in which:
First amplifier, the second amplifier are in parallel, first amplifier, the second amplifier input positive terminal be
The input terminal of tension sensor voltage output signal, the input negative pole end series connection first of first amplifier, the second amplifier
Resistance, the input negative pole end of first amplifier second resistance in parallel with output end, the input cathode of second amplifier
3rd resistor in parallel with output end is held, the output end of first amplifier is connected with the input positive terminal of the third amplifier
4th resistance, the output end of second amplifier are connected the 5th resistance with the input negative pole end of the third amplifier, described
The input positive terminal of third amplifier with simulation the 6th resistance of connecting, the input negative pole end and output end of the third amplifier
7th resistance in parallel；The input positive terminal of third amplifier first capacitor in parallel with input negative pole end, the third amplification
The input positive terminal of device second capacitor in parallel with simulating, the input positive terminal of third amplifier third in parallel with simulating
Capacitor；
The power module is negative and positive dual power, the forward voltage output end of the power module and first amplifier, the
The forward voltage input terminal connection of two amplifiers, third amplifier, the negative voltage output end of the power module and described the
The negative voltage input terminal connection of one amplifier, the second amplifier, third amplifier；
The input terminal of the voltage reference module is connect with the forward voltage of the power module, the voltage reference module it is defeated
Outlet is connect with tension sensor；
The first resistor, the 6th resistance, the 7th resistance are the adjustable potentiometer of resistance value；The second resistance and 3rd resistor
Resistance value it is equal, the 4th resistance is equal with the resistance value of the 5th resistance, and the 6th resistance is equal with the resistance value of the 7th resistance；
Second capacitor (C2) is equal with third capacitor (C3) capacitance, and first capacitor (C1) capacitance is than described second
Capacitor (C2) capacitance is at least more than 10 times.
2. instrument amplifier according to claim 1, it is characterised in that: first amplifier (U1), the second amplifier
(U2), the third amplifier (U3) is track to track output operational amplifier.
3. instrument amplifier according to claim 1, it is characterised in that: first amplifier (U1), the second amplifier
It (U2) be LT6234, the third amplifier (U3) is LT6233.
4. instrument amplifier according to claim 1 or 2 or 3, it is characterised in that: the tension sensor is side-compression
Force snesor, tension transmitter are integrated in the side-pressure tension sensor bottom and metal sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820610316.6U CN208635950U (en) | 2018-04-26 | 2018-04-26 | A kind of instrument amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820610316.6U CN208635950U (en) | 2018-04-26 | 2018-04-26 | A kind of instrument amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208635950U true CN208635950U (en) | 2019-03-22 |
Family
ID=65732389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820610316.6U Expired - Fee Related CN208635950U (en) | 2018-04-26 | 2018-04-26 | A kind of instrument amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208635950U (en) |
-
2018
- 2018-04-26 CN CN201820610316.6U patent/CN208635950U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190322 Termination date: 20200426 |