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. 28, 2004
Filed:
Jan. 16, 2002
Shih-Tsung Yang, San Diego, CA (US);
Jonathon Y. Cheah, San Diego, CA (US);
Ee Hong Kwek, San Diego, CA (US);
Chun-Yip Antony Lau, San Diego, CA (US);
Microtune (San Diego), Inc., San Diego, CA (US);
Abstract
A method and apparatus for tuning a VCO circuit to provide desired modulations is described. In one embodiment, the method of the present invention uses a controlled voltage from a digital-to-analog converter to obtain VCO voltage/frequency characteristics. The VCO voltage/frequency characteristics are used to determine a VCO capacitance value as well as a charge pump current level for each frequency band of interest. For one embodiment, the VCO circuit includes a bank of switchable capacitors used to set the VCO capacitance value. The charge pump includes a number of switch-controlled current meters to set the charge pump current level. The VCO capacitors and charge pump current meters are controlled by an off-chip CPU.