Digital servo circuit

Details Digital servo circuit Digital servo circuit

G - Physics

05

D

318/25

G05D 3/20 (2006.01) G05D 3/00 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1202672

ABSTRACT OF THE DISCLOSURE A digital servo circuit which comprises a first N-bit counter for counting clock pulses at a recurrence frequency corresponding to error data and a second N-bit counter for counting divided recurrence frequency clock pulses at 1/M times the aforementioned recurrence frequency, is disclosed. The digital servo circuit controls the pull-in operation of a servo system with the count output of the second N-bit counter as control data, while it controls the operation of the servo system in the normal phase-locked state thereof with the count outputs of the first and second N-bit counters as control data with the count output of the second N-bit counter changed according to the amount of external disturbance caused to the servo system.

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