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:
Jan. 01, 2008
Filed:
Jan. 27, 2006
Moises E. Robinson, Austin, TX (US);
Shahriar Rokhsaz, Austin, TX (US);
Marwan M. Hassoun, Davis, CA (US);
Earl E. Swartzlander, Jr., Austin, TX (US);
Moises E. Robinson, Austin, TX (US);
Shahriar Rokhsaz, Austin, TX (US);
Marwan M. Hassoun, Davis, CA (US);
Earl E. Swartzlander, Jr., Austin, TX (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
A voltage controlled oscillator (VCO) having a single stage ring-oscillator having both coarse and fine control of the frequency of oscillation is described. In an embodiment the VCO may include a first n-channel latch having a first output and a second output; a first P-channel transistor coupled between a voltage supply and a first VCO output, where a gate of the first P-channel transistor is coupled to the first output of the first n-channel latch; a first programmable resistor circuit coupled between the first VCO output and the first output of the first n-channel latch; and a second n-channel latch coupled to the first VCO output.