Op Amps for Everyone, 3rd Edition

Chapter 22. High Speed Filter Design

22.1. Introduction

Designing of high speed filters, as opposed to designing filters fast (as presented in the last chapter), represents the final frontier of active filter design. As filter operating frequencies approach higher and higher frequencies, their response begins to change in unpredictable ways, presenting the designer with an increasingly difficult design problem. Many of these effects are related to the slew rate limitation of the amplifier and begin to manifest themselves decades in frequency below the unity gain bandwidth. A 1 GHz amplifier may be limited to a few hundred kilohertz when used in a filter design. This chapter presents these limitations and shows actual examples of how successful ...