In this article, we'll discuss instrumentation amplifiers (in-amps) which have high common-mode rejection and provide high and equal input impedances. We will also look at the advantages and disadvantages of a commonly-used in-amp often referred to as the three-op amp in-amp.
source https://www.allaboutcircuits.com/technical-articles/learn-about-three-op-amp-instrumentation-amplifiers/
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