Amplification and acquisition of mV differential signals

QWE4562009

Amplification and acquisition of mV differential signals [Copy link]

Amplification and collection of mV differential signals
Differential input signal detection does not use instrumentation amplifiers, nor is it directly sent to high-precision ADC chips. Instead, it directly uses this form of raising the voltage VREF at the same-direction input end of the amplifier. Can the differential amplification function of the pressure sensor be completed? VOUT = differential signal * amplification factor + VREF reference?

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2023-4-15 18:14 上传

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led2015

Since no instrumentation amplifier or high-precision ADC chip is used, there may be certain errors and noise

dennis_wan

Since no instrumentation amplifier or high-precision ADC chip is used, there may be certain errors and noise

dcexpert

MV-level signals do not cause much trouble for general op amps, and it is best to use a differential amplifier circuit.

QWE4562009

dcexpert posted on 2023-4-16 12:14 MV-level signals do not pose much of a problem to general op amps, and it is best to use a differential amplifier circuit.

Now I have chosen a high-precision ADC chip with internal PGA amplification or MCU, which is much more convenient than op amps.

QWE4562009

led2015 Published on 2023-4-15 20:43 Since no instrument amplifier or high-precision ADC chip is used, there may be certain errors and noise

These two circuits are feasible

dcexpert

QWE4562009 posted on 2023-4-27 16:05 Now I have chosen a high-precision ADC chip with internal PGA amplification or MCU. It is more convenient than op amps...

The cost is totally different.

QWE4562009

dcexpert posted on 2023-4-27 16:08 The cost is also completely different

We are a high-profit, high-value-added product and are not very sensitive to costs.