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. 19, 2006
Filed:
Aug. 20, 2004
Applicants:
Chwei-po Chew, Cupertino, CA (US);
Paul H. Scott, San Jose, CA (US);
Inventors:
Chwei-Po Chew, Cupertino, CA (US);
Paul H. Scott, San Jose, CA (US);
Assignee:
Cypress Semiconductor Corporation, San Jose, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/099 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method and an apparatus to bias a charge pump in a phase locked loop (PLL) to compensate a voltage controlled oscillator (VCO) gain have been disclosed. One embodiment of the apparatus includes a PLL comprising a charge pump, the charge pump comprising an input and an output, and a bias circuit coupled to the input of the charge pump, the bias circuit comprising a sensor circuit to sense a temperature and at least one of a voltage and a process variation and a current reference circuit coupled to the sensor circuit.