What is an instrumentation amplifier?

 Instrumentation amplifiers are an improved version of differential amplifiers with input buffers that do not require input impedance matching and are suitable for measuring and electronic instruments. With features such as very low DC offset, low drift, low noise, very high open-loop gain, very large common-mode rejection ratio, and high input impedance, instrument amplifiers are used in circuits that require very high accuracy and stability. Primarily used for amplifying differential signals, instrumentation amplifiers provide the most important common mode rejection (CMR) function. It eliminates any signal that has the same potential on both inputs. Signals with potential differences between inputs are amplified.

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