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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 415

Matched resistor networks for precision amplifier applications

Tyler Hutchison

Abstract

Matched resistor networks for precision amplifier applications are discussed.

Keywords

Matched resistor network

precision amplifier

LT5400

Introduction

Some ideal op amp configurations assume that the feedback resistors exhibit perfect matching. In practice, resistor non-idealities can affect various circuit parameters such as common mode rejection ratio (CMRR), harmonic distortion and stability. For instance, as shown in Figure 415.1, a single-ended amplifier configured to level-shift a ground-referenced signal to a common mode of 2.5V needs a good CMRR. Assuming 34dB CMRR and no input signal, this 2.5V level shifter exhibits an output ...

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