Op Amps for Everyone, 5th Edition

Chapter 18

High-Speed Filters

Abstract

High-speed op amps have given rise to high-speed band-pass filters. While the design techniques remain the same, the open-loop response of the op amp gives rise to some interesting, but troubling, limitations to what can be done in the design of an active filter.

Keywords

Frequency shift; Gain compression; High-speed filters; Open-loop response

18.1. Introduction

Once the exclusive domain of passive filters and discrete components, op amps have progressed to the point where they can be considered for high-frequency filter design. At high speeds, however, filter design gets particularly challenging. The main limitation of high-speed op amp filter design comes from the op amp open-loop bandwidth. You may remember ...