Chapter 21

Composite amplifiers

Jim Williams

Amplifier design, regardless of the technology utilized, is a study in compromise. Device limitations make it difficult for a particular amplifier to achieve optimal speed, drift, bias current, noise and power output specifications. As such, various amplifier families emphasizing one or more of these areas have evolved. Some amplifiers are very good attempts at doing everything well, but the best achievable performance figures are limited to dedicated designs.

Practical applications often require an amplifier that has extremely high performance in several areas. For example, high speed and DC precision are often needed. If a single device cannot simultaneously achieve the desired characteristics, a ...

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