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Title:
DC-DC CONVERTER WITH REDUCED ELECTROMAGNETIC INTERFERENCE
Document Type and Number:
WIPO Patent Application WO2004084392
Kind Code:
A3
Abstract:
A DC-DC converter includes a variable frequency oscillator (36), a control system and a power train. The DC-DC converter is well suited for use in a cell phone. The control system uses the output of the oscillator to control the power train. The oscillator varies its frequency as a function of a pseudo random number generator (60), thereby reducing electromagnetic interference caused by ripple in the output of the DC-DC converter.

Inventors:
DENING DAVID
Application Number:
US2004007307W
Publication Date:
December 09, 2004
Filing Date:
March 11, 2004
Export Citation:
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Assignee:
RF MICRO DEVICES, INC.
International Classes:
H02M3/156; H03K7/08; H03K7/10; H04B15/02; H04B15/04; (IPC1-7): H02M3/156
Foreign References:
EP1235335A22002-08-28
GB2232835A1990-12-19
Other References:
VINCENT BIANCOMANO, EETIMES, 14 October 2002 (2002-10-14), XP002299544, Retrieved from the Internet [retrieved on 20041006]
KINNEMENT D J ET AL: "Design of an on-chip random number generator using metastability", PROCEEDINGS OF THE EUROPEAN SOLID STATE CIRCUITS CONFERENCE, XX, XX, 24 September 2002 (2002-09-24), pages 595 - 598, XP002273019
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