Phase locked loop with limited lock time

Details Phase locked loop with limited lock time Phase locked loop with limited lock time

1990-08-06

1999-11-16

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03L 700

Patent

active

059865130

ABSTRACT:
A phase locked loop circuit employing a single phase detector provides limited maximum lock time by avoiding hang-up. The circuit first establishes a gross indication of phase relation sufficient to establish a direction of phase shift away from the unstable equilibrium point. The phase is then shifted by a predetermined value to establish a bounded phase relation exclusive of the unstable equilibrium point and inclusive of the stable equilibrium point. Conventional phase locking then provides the desired frequency and phase relation, but without potential for hang-up.

REFERENCES:
patent: 4926140 (1990-05-01), Schenberg

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