Circuit and method for reducing electromagnetic interference

Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion

Reexamination Certificate

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C375S130000

Reexamination Certificate

active

07342528

ABSTRACT:
A spread spectrum system having a self-oscillating delay-line digital pulse width modulator and a method for mitigating electromagnetic interference. The spread spectrum system has a pseudo-random pattern generator connected to a digital-to-analog converter, which in turn is connected to a linear regulator. The linear regulator receives a reference voltage from the digital-to-analog converter and creates a frequency varying voltage that serves as an input voltage for delay elements of a delay-line based digital pulse width modulator. In response to frequency varying input signal, the delay-line based digital pulse width modulator generates a frequency varying voltage that is input to a switching network to vary its switching frequency.

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