CHAPTER 9Filter Design

A filter is a circuit that passes signals of some frequencies but blocks or attenuates those of other frequencies. The most common filters are RC or LC networks. Active filters using op amps and RC networks are also popular. High-frequency filters are made with LC networks, quartz crystals, ceramics, surface acoustic wave (SAW) devices, and other components. In this chapter, you will learn how to design basic RC and LC filters, as well as active filters with op amps. These filters are the ones you will most likely need or encounter. Online filter design calculators are available to simplify and speed up your design.

The primary characteristic of a filter is its selectivity. Selectivity is the sharpness of response between ...

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