The Evolution of the Instrumentation Amplifier (.PDF Download)

In the past, the term instrumentation amplifier (INA) was often misused, referring to the application rather than the device’s architecture. INAs are related to op amps, in that they’re based on the same architecture, but an INA is a specialized version of an op amp. INAs are specifically designed and used for their high differential gain to amplify microvolt-level sensor signals while simultaneously rejecting high-common-mode signals that can be several volts. This is important

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