Spread spectrum modulation of a clock signal for reduction...

Details Spread spectrum modulation of a clock signal for reduction... Spread spectrum modulation of a clock signal for reduction...

2006-03-03

2008-08-26

Pascal, Robert J. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S078000, C332S123000, C375S130000

Reexamination Certificate

active

07417509

ABSTRACT:
A spread spectrum frequency modulated oscillator circuit usable as a clock comprises a reference component such as a resistor, a voltage controlled oscillator and a first circuit coupled to the reference component and voltage controlled oscillator and configured to supply a first control signal to the oscillator to cause the oscillator to oscillate at a frequency corresponding to a value of the reference component. A second circuit configured to supply a random signal to the oscillator causes the frequency of the oscillator to dither. To cause the oscillator to exhibit random frequency modulation that is fast enough to reduce EMI but not too fast for controlled devices such as switching regulators to track, the oscillator includes a third circuit configured to control (1) a rate of change of the oscillator frequency such that the rate of change is a fixed percentage of the oscillator frequency, and (2) an amount of frequency change in the oscillator frequency such that the amount of frequency change is a fixed percentage of the oscillator frequency.

REFERENCES:
patent: 6342817 (2002-01-01), Crofts et al.
patent: 6614313 (2003-09-01), Crofts et al.
patent: 2005/0008113 (2005-01-01), Kokubo et al.
“Low-Frequency, Spread-Spectrum EconOscillator,” Dallas Semiconductor MAXIM, DS1090.
“Multiphase Oscillator with Spread Spectrum Frequency Modulation,” Linear Technology, LTC6902.

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