One-shot control circuit for tracking a voltage-controlled oscil

Details One-shot control circuit for tracking a voltage-controlled oscil One-shot control circuit for tracking a voltage-controlled oscil

1993-02-03

1994-08-30

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 17, 331 18, 331 25, 375120, H03L 706, H03L 707, H03L 708

Patent

active

053431677

ABSTRACT:
A one-shot control mechanism for ensuring close tracking of one-shot period to VCO period. The one-shot control mechanism provides immunity to data jitter and other spurious phenomena as well as stable and accurate tracking of one-shot period even when the VCO frequency varies from the center frequency of the VCO. The present invention includes a data capture PLL circuit and a frequency reference PLL circuit. The frequency reference PLL circuit provides a control signal to one or more one-shots to control their output pulse duration. Since the frequency reference PLL circuit operates at the expected frequency of data input, a relatively constant relationship may be maintained between the output pulse duration of the one-shots and the period of the VCO output.

REFERENCES:
patent: 4667168 (1987-05-01), Shiomi et al.
patent: 4868522 (1989-09-01), Popat et al.
patent: 5043677 (1991-08-01), Tomassetti et al.
patent: 5124669 (1992-06-01), Palmer et al.
patent: 5172397 (1992-12-01), Llewellyn

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