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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 445

Peak detectors gain in speed and performance

John Wright

Abstract

The gain in speed and performance of peak detectors is discussed.

Keywords

Peak detector

LT1190

Introduction

Fast peak detectors place unusual demands on amplifiers. High slew rate is needed to keep the amplifier internal nodes from overracing the output stage. This condition causes either a long overload, or DC accuracy errors. To support the high slew rate at the output, the amplifier must deliver large currents into the capacitive load of the detector. Compounding these problems are issues of amplifier instability with a large capacitive load, as well as the accuracy of the output voltage.

Detecting sine waves

The LT1190 is the ideal candidate for ...

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