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:
Aug. 24, 2010
Filed:
Sep. 30, 2008
Hooman Darabi, Irvine, CA (US);
Yuyu Chang, Irvine, CA (US);
Zhimin Zhou, Rancho Palos Verdes, CA (US);
Morteza Vadipour, Woodland Hills, CA (US);
Hooman Darabi, Irvine, CA (US);
Yuyu Chang, Irvine, CA (US);
Zhimin Zhou, Rancho Palos Verdes, CA (US);
Morteza Vadipour, Woodland Hills, CA (US);
Broadcom Corporation, Irvine, CA (US);
Abstract
A frequency tuning device for use in a crystal oscillator circuit includes a first fine tuning array of capacitors, a second fine tuning array of capacitors and a coarse tuning array of capacitors coupled in parallel to produce a tuning capacitance for tuning the crystal oscillator. The first fine tuning array of capacitors includes a binary weighted switched capacitor network, the second fine tuning array of capacitors includes a thermometer coded switched capacitor network and the coarse tuning array of capacitors includes a binary weighted switched capacitor network with a different unit capacitance value than the first and second fine tuning arrays.