Chapter 8
1/f Noise and Zero-Drift Amplifiers
This chapter focuses on errors in low-frequency applications. Input offset voltage drift and 1/f noise are studied in detail. Standard topologies are compared and contrasted with the zero-drift amplifier topology, which has low offset drift and no 1/f noise.
8.1 Zero-Drift Amplifiers
Zero-drift amplifiers are operational amplifiers (op-amps) that periodically self-calibrate offset, offset drift, and low-frequency noise errors. The calibration period for different zero-drift amplifiers ranges from 10 kHz to 100 kHz. A digital circuit inside of the zero-drift amplifier controls the calibration; however, the amplifier acts as a normal linear op-amp from the board- and system-level view. There are two ...
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