Phase locked loop clock synchronizing circuit with programmable controller
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United States of America Patent
Stats
-
Dec 8, 1981
Grant Date -
N/A
app pub date -
Nov 14, 1979
filing date -
Nov 14, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A clock synchronization unit for controlling frequency and phase of a local clock and synchronism with an external clock signal, employs a programmable controller as a part of a phase-locked loop. The controller provides highly accurate control of the clock, including verification of the accuracy of the clock control signal before applying it to the clock oscillator as well as control of the magnitude to the clock oscillator to avoid rapid changes in frequency. In one particular embodiment, the programmable controller comprises duplicated microprocessors which perform operations in step. In a master/slave oscillator arrangement, the controller controls the slave clock oscillator as well as the master to assure tracking of the slave to the master.
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