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85V, –100V Common Mode Range Instrumentation Amplifier (AV = 10)

85V, –100V Common Mode Range Instrumentation Amplifier (AV = 10)

The input section is a classic difference amplifier set to A=0.1 so that the Vcm is attenuated by 10x along with the signal of interest. The second section has A=100 so that the overall circuit has A=10 but yet supports a large Vcm working range.