7 Introduction to Analog Active Filters

7.1 INTRODUCTION

Filter (n.) is an electrical engineering term having a broad meaning. Filters are generally considered to operate on signals in the frequency domain; that is, they attenuate, stop, pass, or boost certain frequency regions in the input signal’s power density spectrum. These operations are called filtering (v.). Filter operations are classified as low-pass (LP), bandpass (BP), high-pass (HP), band-reject (BR), or notch. Bandpass and band-reject filters can have narrow (tuned) pass-bands or reject bands. One descriptor of such sharply tuned filters is their “Q.” Q can be defined as the BP filter’s ...

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