Abstract
This paper describes a new electronic circuit, the time domain difference amplifier, used to reduce strong drifts which bury weak repetitive signals. The principle is that the input, with signal and drift, is sampled at signal on and signal off states, and subtracted from each other. The random drift is reduced by integrating the subtracted values. Drift suppression is about 35 dB for 3.0 Hz ac drift and 100 repeatings for integration.
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