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Instrumentation Amplifiers

Last modified by Microchip on 2023/11/09 09:03

The circuit below shows an instrumentation amplifier that conditions a remote voltage sensor. The input resistors provide isolation and detection of the sensor open-circuit failure. It amplifies the input difference voltage (V_SEN+ - V_SEN-) and rejects common mode noise.

An instrumentation amplifier

Advantages

Excellent rejection of common mode noise, e.g. great for remote sensors
Resistive isolation from the source
Detection of sensor failure

Disadvantages

Resistive loading of the source
Higher cost

Sensor Examples

Remote thermocouple
Remote Resistive Temperature Detector (RTD) (with a current source or voltage divider to produce a voltage from the RTD)
Wheatstone Bridge

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