This subject is treated in more detail in Section VI. Switched-capacitor circuits, which contain capacitors, transistor switches, and operational amplifiers, have been successfully used for analog pre- and postfilters required at the interface between analog and digital systems. During the past few years, switched-capacitor filters have become popular as high-precision replacements for certain types of active filters that are to be realized in monolithic form as part of a more extensive integrated system. The active filter is probably the most common analog signal processor in use today. Spectral shaping is probably the most common form of analog signal processing and is typically done with either passive (containing resistors, capacitors, and inductors) or active analog filters. Jenkins, in Encyclopedia of Physical Science and Technology (Third Edition), 2003 I IntroductionĪnalog signals are processed by specially designed devices, circuits, or systems to extract parametric information or to alter the characteristics of the input signal in some prescribed way.
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