RICHARD CHEN
Pilots at White Fir Ln, Pomona, CA
License number
California A5243134
Issued Date
Apr 2015
Expiration Date
Apr 2016
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
22712 White Fir Ln, Pomona, CA 91765
Professional information
Differential Varactor Circuit For A Voltage Controlled Oscillator
US Patent:
8098109, Jan 17, 2012
Filed:
Jul 27, 2009
Appl. No.:
12/460989
Inventors:
Qiang Li - Irvine CA, US
Richard Chen - Diamond Bar CA, US
Richard Chen - Diamond Bar CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H03B 1/00
US Classification:
331177V, 331 36 C, 331108 R, 331 16, 331185, 331175
Abstract:
According to one exemplary embodiment, a differential varactor circuit for a voltage controlled oscillator having two differential outputs includes a first varactor having first and second terminals and a second varactor having first and second terminals. In the differential varactor circuit, each of the first and second terminals of the first varactor and each of the first and second terminals of the second varactor are coupled to one of the two differential outputs of the voltage controlled oscillator, thereby allowing a size of each of the first and second varactors to be reduced so as to increase varactor quality factor. Each of the first and second terminals of the first varactor can be coupled to one of the two differential outputs by a capacitor, and each of the first and second terminals of the second varactor can be coupled to one of the two differential outputs by a capacitor.