Retriggered oscillator for jitter-free phase locked loop frequen

Details Retriggered oscillator for jitter-free phase locked loop frequen Retriggered oscillator for jitter-free phase locked loop frequen

1993-01-19

1994-09-06

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 331 1A, 331 25, 331 57, H03K 526, H03L 7087

Patent

active

053451864

ABSTRACT:
An embodiment of the present invention is a retriggered oscillator timebase including a phase lock loop controlled ring for direct retriggering by a reference oscillator. The ring has taps at various successive stages that are output to an on-the-fly selector that can add any ten-bit value to a current-tap selection to enable a next-tap selection. Such on-the-fly addition can increase the period of a signal each cycle and thereby divide the reference frequency. Ring outputs are also used to drive two other retriggered rings for a plurality of NANO timing generators. The use of two rings allows retriggering of one of the rings before the other has completed a whole one-shot cycle. An on-the-fly selector subtracts a value from a present "NANO" select to a next "NANO" select to convert back the timebase to the fixed reference frequency for phase and frequency comparison. The subtraction acts as a frequency multiplication whose output "t.sub.0fx " is equal to the reference frequency.

REFERENCES:
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patent: 4902986 (1990-02-01), Lesmeister
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patent: 5068628 (1991-11-01), Ghoshal
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patent: 5136260 (1992-08-01), Yousefi-Elezei
patent: 5233314 (1993-08-01), McDermott et al.
patent: 5233316 (1993-08-01), Yamada et al.

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