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:
Oct. 02, 2001
Filed:
Dec. 23, 1999
Applicant:
Inventor:
Stuart W. Pullen, Raleigh, NC (US);
Assignee:
Red Chip Company Limited, Tortola, VG;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 3/38 ;
U.S. Cl.
CPC ...
H03F 3/38 ;
Abstract
The frequency spectrum of variable frequency class D modulator interferes with RF signals in the AM bandwidth. Here several techniques solve the problem including an amplifier that synchronizes an external clock input the summing node of the integrator, an amplifier that gates an external clock to the modulator using a transmission gate that responds to the AM frequency, and an amplifier that adjusts its own hysteresis to provide a clock that does not interfere with AM input signals.