Abstract
Automatic gain control (AGC) units are widespread in modern telecommunication systems. The main function of AGC is to stabilize the amplitude of the processed signal. AGC generates a constant amplitude output signal when the input signal level changes. This article describes an all-digital architecture for automatic open-loop gain control designed to generate constant amplitude of the power-line interference extracted from the common-mode signal during ECG biopotential recording. The presented open-loop AGC has a very simple architecture and can be applied to other applications where AGC functionality is needed.
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