Track and hold phase locked loop circuit

Details Track and hold phase locked loop circuit Track and hold phase locked loop circuit

1990-05-21

1991-04-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 27, 328155, 375120, 360 51, H03L 7091, H03L 7099

Patent

active

050068199

ABSTRACT:
A phase locked loop circuit including ramp generating circuitry for generating a dual slope ramp signal having alternating positive and negative slopes that are controlled by the level of the control signal, and sampling circuitry responsive to sample command pulses for providing a sample output representative of the level of the dual ramp signal at the time of sampling. The sample output is provided to a loop which provides the control signal for the ramp generating circuit. Also disclosed is a phase locked loop having ramp generating circuitry for generating a ramp signal, and track and hold circuitry having a plurality of track/hold capacitors that are controlled to track the ramp voltage or hold the ramp signal voltage in response to a sample command signal, such that only a capacitor that is tracking is switched to hold the ramp voltage in response to the sample command signal.

REFERENCES:
patent: 4358736 (1982-11-01), De Boer
patent: 4496912 (1985-01-01), Wynn

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