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How to Build a "Textbook" In Amp

Then matched resistors are added around the op amp, which creates a difference amplifier. Like an instrumentation amplifier, a difference amplifier is a subtractor. Unlike an instrumentation amplifier, a difference amplifier has fairly low input impedance, which prevents it from measuring sensors with high output impedance. Also, unlike an instrumentation amplifier, the difference amplifier has a tradeoff between gain and input impedance. High gain instrumentation amplifiers typically have low input impedance.

PTM Published on: 2011-01-04