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:
Dec. 07, 2004
Filed:
Dec. 27, 2001
Applicant:
Inventors:
Derek Tam, Irvine, CA (US);
Jasmine Cheng, Irvine, CA (US);
Jungwoo Song, Irvine, CA (US);
Takayuki Hayashi, Irvine, CA (US);
Assignee:
Broadcom Corporation, Irvine, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 2/900 ; H03L 7/06 ;
U.S. Cl.
CPC ...
H01L 2/900 ; H03L 7/06 ;
Abstract
In a low-pass filter for a phase locked loop (PLL) circuit, a capacitor formed by an N-type substrate, a P-type region formed on the N-type substrate, a thick oxide formed over the P-type region, a P gate electrode formed over the thick oxide and coupled to a first voltage supply line, and P pick-up terminals formed in the P-type region adjacent the gate electrode and coupled to a second voltage supply line, whereby a gate-to-substrate voltage is maintained at less than zero volts to maintain a stable control voltage for the PLL.