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. 05, 2005
Filed:
May. 23, 2003
Yido Koo, San Jose, CA (US);
Jeong-woo Lee, San Jose, CA (US);
Joonbae Park, San Jose, CA (US);
Kyeongho Lee, San Jose, CA (US);
Yido Koo, San Jose, CA (US);
Jeong-Woo Lee, San Jose, CA (US);
Joonbae Park, San Jose, CA (US);
Kyeongho Lee, San Jose, CA (US);
GCT Semiconductor, Inc., San Jose, CA (US);
Abstract
A voltage-controlled oscillator including an active oscillator circuit, an inductor, and capacitive circuits is disclosed. The capacitive circuits are selectively turned on and off to control the frequency of the voltage-controlled oscillator. Particularly, the inductor and the capacitors in the capacitive circuits form LC circuits that provide feedback to the active oscillator circuit. To avoid damage to the switches in the capacitive circuits, the capacitive circuits further comprise resistors. The resistors can be configured in several different ways so that the voltage-controlled oscillator can have a high degree of reliability, and a wide tuning range with constant phase noise performance.