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:
Sep. 20, 2011
Filed:
Oct. 10, 2009
Krishnasawamy Nagaraj, Plano, TX (US);
Neeraj Nayak, Richardson, TX (US);
Srinadh Madhavapeddi, Dallas, TX (US);
Baher Haroun, Allen, TX (US);
Krishnasawamy Nagaraj, Plano, TX (US);
Neeraj Nayak, Richardson, TX (US);
Srinadh Madhavapeddi, Dallas, TX (US);
Baher Haroun, Allen, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
Various apparatuses and methods for a low phase noise frequency synthesizer are disclosed herein. For example, some embodiments provide an oscillator that may be used in a low phase noise frequency synthesizer. The oscillator includes a tank circuit, a plurality of cross-coupled transistor pairs connected to the tank circuit, a current source connected to the plurality of cross-coupled transistor pairs, and at least one switch connected to the plurality of cross-coupled transistor pairs. The switch is adapted to activate a subset of the plurality of cross-coupled transistor pairs and to deactivate another subset of the plurality of cross-coupled transistor pairs to operate the tank circuit in the oscillator using the activated subset of the plurality of cross-coupled transistor pairs.