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Op Amps for Everyone, 3rd Edition by Bruce Carter

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Appendix B. Terminating Differential Amplifiers
Bruce Carter
B.1. Introduction
Termination of differential amplifiers is a complex and little understood technique. It has been moved to an appendix because it is a rarely used design problem and so it doesn't slow the flow of material in Chapter 3. It should also be understood that the term differential amplifier refers to a single ended op amp configured as a differential amplifier, as opposed to a fully differential op amp configured as a differential amplifier, which is covered separately.
Op amp instrumentation amplifiers have been the mainstay of high accuracy DC instrumentation for decades. The familiar three op amp topology of Figure B.1 has the advantage of high input impedance on both inputs, ...

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