Variable speed phase locked loop

Details Variable speed phase locked loop Variable speed phase locked loop

1991-12-26

1993-04-06

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 16, 331 25, H03L 7093, H03L 718

Patent

active

052007120

ABSTRACT:
A variable speed phase locked loop includes a phase detector and a voltage controlled oscillator, the output of which is provided through a divider circuit to the phase detector. A plurality of delay elements and a decoder divide the period of the phase detector input signal into discrete portions for enabling a plurality of weighted current sources. The current sources are coupled to the phase detector and change its gain. In the locked condition with minimum phase error, the gain of the phase detector is at a minimum and is progressively increased to a maximum when the phase error is maximum.

REFERENCES:
patent: 4714899 (1987-12-01), Kurtzman et al.
patent: 4980653 (1990-12-01), Shepherd

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