SECTION 2-1

Instrumentation Amplifiers

Walt Kester and Walt Jung

Probably the most popular among all of the specialty amplifiers is the instrumentation amplifier (hereafter called simply an in amp). The in amp is widely used in many industrial and measurement applications where dc precision and gain accuracy must be maintained within a noisy environment, and where large common-mode signals (usually at the ac power line frequency) are present.

Op Amp/In Amp Functionality Differences

An in amp is unlike an op amp in a number of very important ways. As already discussed, an op amp is a general-purpose gain block—user-configurable in myriad ways using external feedback components of R, C, and, (sometimes) L. The final configuration and circuit ...

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