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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