Continuous-Time Active Filter Design


This book is about continuous-time filters. The classic LCR filters built with inductors,

capacitors, and resistors are such filters, of course, and indeed are still much in use. However,

these filters are unsuitable for implementation in the ubiquitous integrated circuit,

since no satisfactory way of making inductors on chip has been found. That is why so much

attention has been paid to active continuous-time filters over the years. Active filters offer

the opportunity to integrate complex filters on-chip, and do not have the problems that the

relatively bulky, lossy, and expensive inductors bring—in particular their stray magnetic

fields that can provide unwanted coupling in a circuit or system. It is therefore active continuous-

time filters on which we shall concentrate here.

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