Method and apparatus for synchronizing to a pulse train packet s

Details Method and apparatus for synchronizing to a pulse train packet s Method and apparatus for synchronizing to a pulse train packet s

1987-05-01

1989-02-21

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

H03L 700

Patent

active

048068799

ABSTRACT:
An apparatus and method for synchronizing to a scanning galvanometer system provide for magnification changes on the order of one part in a thousand. The apparatus employs two phase locked loops connected in series with a digital counter divider. The combination of phase locked loop, digital divider, and phase locked loop provide a multiplication factor equal to a*c/b which enables the required precision in magnification step change to be achieved. Critical to operation of the circuitry is the provision for resetting the divider counter when the first phase locked loop is sufficiently synchronized to a ruled grating which is part of the scanning system.

REFERENCES:
patent: 4067021 (1978-01-01), Baylis et al.
patent: 4080634 (1978-03-01), Schreiber
patent: 4131861 (1978-12-01), Malaviya
patent: 4203672 (1980-05-01), Smith
patent: 4233636 (1980-11-01), Harbaugh et al.
patent: 4365211 (1982-12-01), Lee
patent: 4459560 (1984-07-01), Kurihara
patent: 4566091 (1986-01-01), Gerard et al.
patent: 4566092 (1986-01-01), Gerard et al.

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