Instrumentation amplifier input-circuit strategies

Baker, Bonnie
August 2012
EDN;Aug2012, Vol. 57 Issue 14, p20
Trade Publication
The article provides inexpensive solutions for avoiding pitfalls in the instrumentation amplifier (INA) circuit's input-stage. A current-return path to ground and a bias-voltage reference is cited to be needed in a classic, three-op-amp INA to prevent saturation or floating of the input stage to an undesirable voltage. A thermocouple connection to INA where both inputs have a path to ground is suggested. An INA's output voltage is presented to represent the voltage of the thermocouple.


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