High Common Mode Voltage Difference Amplifier circuit
Achieving a high common mode voltage differential amplifier requires a very high attenuation resistor network.
To minimize op amp input offset voltage and drift errors, an autozero type is used– OPA735. An OPA335 can be used on a 5V supply. Common- mode rejection is critically dependent on the ratio matching of R3:R2 & R4:R1. These should be matched to extremely tight tolerances. Power dissipation in R3 & R4 are significant. Bypass capacitors are not shown. (Circuit is created by Neil P. Albaugh TI – Tucson)
High Common-Mode Voltage Difference Amplifier circuit:
Creation and Simulation of a 1 kV High Common-Mode Voltage Difference Amplifier circuit
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