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:
Jul. 14, 2009
Filed:
Apr. 22, 2003
Paul Kevin Hall, Lexington, KY (US);
Keith Bryan Hardin, Lexington, KY (US);
Robert Allan Menke, Georgetown, KY (US);
Robert Aaron Oglesbee, Lexington, KY (US);
Paul Kevin Hall, Lexington, KY (US);
Keith Bryan Hardin, Lexington, KY (US);
Robert Allan Menke, Georgetown, KY (US);
Robert Aaron Oglesbee, Lexington, KY (US);
Other;
Abstract
For EMI reduction the current modulation profile is preferably used for frequencies over 1 GHz while the frequency deviation is increased at least to ±2.5 MHz and the modulation frequency is increased to at least 150 kHz, preferably about 260 kHz. In an alternative embodiment, the modification frequency is 1 MHz or greater so that a segmented spectrum is achieved. For clocks having basic frequency below 1 GHz, but having strong harmonics higher than 1 GHz, modulation of the foregoing is combined with the slower modulation currently used. EMI reduction is realized both at the lower and the higher harmonics.