McDermott Will & Emery LLP
Methods and circuits for frequency modulation that reduce the spectral noise of switching regulators
The present invention comprises methods and circuits for spread spectrum frequency modulation that reduce peak spectral noise at the outputs or inputs of switching regulators. More specifically, the present invention modulates the operating frequency of the switching regulator in accordance with a frequency modulation waveform having a shape coordinated to a peak noise amplitude waveform that describes the correlation between the operating frequency of a switching regulator and the peak noise amplitude at the regulator's input or output absent spread spectrum frequency modulation.
Linear Technology Corporation
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Randy Guy Doug Yuhui Robert C.
Flatness LaPorte Chen Dobkin