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Op Amps for Everyone, 3rd Edition by Bruce Carter

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Chapter 12. Op Amp Noise Theory and Applications
Bruce Carter
12.1. Introduction
The purpose of op amp circuitry is the manipulation of the input signal in some fashion. Unfortunately, in the real world, the input signal has unwanted noise superimposed on it.
Noise is not something most designers get excited about. In fact, they probably wish the whole topic would go away. It can, however, be a fascinating study by itself. A good understanding of the underlying principles can, in some cases, be used to reduce noise in the design.
12.2. Characterization
Noise is a purely random signal, the instantaneous value or phase of the waveform cannot be predicted at any time. Noise can either be generated internally in the op amp or from its associated passive ...

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