Instrumentation amplifier

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An instrumentation amplifier (sometimes shorthanded as in-amp or InAmp) is a precision differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment.

Excerpt from the Wikipedia article “Instrumentation amplifier”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Inductiveload, Public domain, via Wikimedia Commons.