Wide bandwidth phase locked loop circuit with sliding window ave

Details Wide bandwidth phase locked loop circuit with sliding window ave Wide bandwidth phase locked loop circuit with sliding window ave

1989-09-01

1990-10-16

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 12, 331 45, H03L 7087, H03L 7093, H03L 718

Patent

active

049638394

ABSTRACT:
Broadband, single and multiphase phase lock loop circuits utilize a sliding window averager to remove the second harmonic and other ac components from a phase error signal which is the product of a sinusoidal or square wave source signal and a corresponding reference signal synthesized from a variable frequency signal produced by a voltage controlled oscillator as a function of the integratal of the phase error signal. The sliding window averager maintains a running average of a number of most recent samples of the phase error signal taken over a selected interval which is preferably one-half cycle of the source signal. Also preferably, the sliding window averager is clocked by the variable frequency signal generated by the voltage controlled oscillator.

REFERENCES:
patent: 4463432 (1984-07-01), Carter, II
patent: 4468632 (1984-08-01), Crowley
patent: 4669024 (1987-05-01), Stacey
patent: 4811236 (1989-03-01), Brennen et al.

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