A frequency-insensitive phase-memory circuit
A. W. de GROOT, Glenn W. Swift · International Journal of Electronics · 1977
An electronic circuit that tracks the phase of a sinusoidal signal and then ‘remembers’ the phase for a short time after the signal has collapsed to zero, is described. A simple tuned circuit will accomplish the desired result at one frequency ; the self-tuning circuit described here will operate properly over a range of frequencies.