Electronic apparatus having low radio frequency interference fro

Details Electronic apparatus having low radio frequency interference fro Electronic apparatus having low radio frequency interference fro

1993-11-09

1996-04-09

Pascal, Robert J.

Oscillators

Electrical noise or random wave generator

331 25, H04L 700, H03B 2900

Patent

active

055065457

ABSTRACT:
A spread-spectrum clock circuit is applied to microprocessor or other clocked digital electronic equipment for the purpose of reducing spectral emissions residing at harmonic and subharmonic multiples of the clock frequency. This clock randomly varies the frequency of its output within a frequency constraint bound centered at the average clock frequency. The center frequency of the spread-spectrum clock is stable and is usable for timing and measurement applications. The spread-spectrum clock is a sealed, self-contained circuit module that can be applied to existing digital electronic equipment without modification.

REFERENCES:
patent: 3573652 (1971-04-01), Charters
patent: 4507796 (1985-03-01), Stumfall
patent: 5115202 (1992-05-01), Brown

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