The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2008
Filed:
Apr. 29, 2004
Methods and circuits for frequency modulation that reduce the spectral noise of switching regulators
Yuhui Chen, Fremont, CA (US);
Doug Laporte, San Jose, CA (US);
Randy Guy Flatness, Los Gatos, CA (US);
Robert C. Dobkin, Monte Sereno, CA (US);
Yuhui Chen, Fremont, CA (US);
Doug LaPorte, San Jose, CA (US);
Randy Guy Flatness, Los Gatos, CA (US);
Robert C. Dobkin, Monte Sereno, CA (US);
Linear Technology Corporation, Milpitas, CA (US);
Abstract
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.