Digital frequency jittering apparatus with random data...

Details Digital frequency jittering apparatus with random data... Digital frequency jittering apparatus with random data...

2008-04-15

2008-04-15

Mis, David (Department: 2817)

Oscillators

Electrical noise or random wave generator

Reexamination Certificate

active

07358821

ABSTRACT:
A digital frequency jittering circuit for varying a switching frequency of a power supply is disclosed. The digital frequency jittering circuit includes a random data generator, an analog to digital functional module, and a digital to analog functional module. The random data generator has an oscillator for generating an oscillating signal having the switching frequency; a delay module for delaying the oscillating signal by first and second delay amounts to generate first and second delayed signals, wherein the first delay amount is not equal to the second delay amount; and a phase error detecting module for detecting an phase error between the first and the second delayed signals to generate a random data. The analog to digital functional module converts the random data into a digital random value. The digital to analog functional module varies the switching frequency of the oscillating signal according to the digital random value.

REFERENCES:
patent: 6229366 (2001-05-01), Balakrishnan et al.
patent: 6249876 (2001-06-01), Balakrishnan et al.
patent: 7243117 (2007-07-01), Yamamoto et al.

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