Oscillators – Plural oscillators – Oscillator used to vary amplitude or frequency of another...
Patent
1991-03-13
1991-10-22
Mis, David
Oscillators
Plural oscillators
Oscillator used to vary amplitude or frequency of another...
331 2, 331 18, 331 55, 331172, H03L 700, H03L 706
Patent
active
050599267
ABSTRACT:
This invention provides an improved method for synchronizing a slave oscillator with a master oscillator. The slave includes two counters designated Reference and System, driven by its oscillator; the master includes a System Counter driven by its oscillator. The master sends a reset signal to the slave, simultaneously resetting its System Counter. Periodically, the master sends to the slave a synchronization signal, which signal is generated at predetermined intervals based upon the master's System Counter. Upon receipt of the reset signal, the slave resets its counters. Later, upon receipt of the synchronization pulse, the slave modifies the value of its System counter based upon the closest multiple of the expected count value for the synchronization signal interval. The Reference Counter is not synchronized and runs free. At each synchronization signal, the slave compares its System Counter and Reference Counter to compute an oscillator error thus: ##EQU1## The slave stores this value and, depending on its mode of operation, uses it warp its own oscillator.
REFERENCES:
patent: 4282493 (1981-08-01), Moreau
patent: 4305045 (1981-12-01), Metz et al.
patent: 4450518 (1984-05-01), Klee
patent: 4458214 (1984-07-01), Lakomy
patent: 4550292 (1985-10-01), Smith
patent: 4598257 (1986-07-01), Southard
Egan Wayne J.
Mis David
Motorola Inc.
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