Method for fast frequency acquisition in a phase locked loop

Details Method for fast frequency acquisition in a phase locked loop Method for fast frequency acquisition in a phase locked loop

1990-12-14

1991-11-26

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, H03L 7085

Patent

active

050686259

ABSTRACT:
The method of the present invention provides fast frequency acquisition in a PLL. The peak voltage for a phase error signal is detected at time t.sub.p and a voltage controlled oscillator warp voltage is sampled at t.sub.p. The new warp voltage to the voltage controlled oscillator is set to what the warp voltage was at t.sub.p. The bandwidth of the loop is then narrowed and the warp voltage is averaged over a number of samples. The warp voltage is then set to the average warp voltage and the loop bandwidth is widened.

REFERENCES:
patent: 4972160 (1990-11-01), Sylvain

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