Delay lock loop modulator and demodulator

摘要

A delay lock loop has a fixed delay element, means for detecting the edge transitions of pulses, analog or digital feedback means related to the timing differences between the edge transitions of a pair of pulses and a variable delay means responsive to the feedback means for adjusting the timing differences between a pair of pulses in response to the feedback signals. In the analog embodiment, the feedback may be a voltage related feedback with a varying voltage controlling a voltage responsive variable delay means. In the digital embodiment, the feedback means may use a counter responsive to signals from an edge detecting flip-flop and the counter may control a programmable delay means.