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:
May. 25, 1999
Filed:
Nov. 14, 1997
Applicant:
Inventors:
James Divine, Austin, TX (US);
Jeffrey Niehaus, Austin, TX (US);
John Pacourek, Austin, TX (US);
Baker Scott, III, Austin, TX (US);
Assignee:
Cirrus Logic, Inc., , DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 16 ; 331 34 ; 331 44 ; 3311 / ;
Abstract
A voltage controlled oscillator with bias current calibration includes a voltage controlled oscillator 1504. A tuning current source 1510 is coupled to oscillator 1504 in parallel with bias current source 1512 for providing a tuning current to oscillator 1504. A selected control voltage is provided by oscillator 1504 for setting an oscillator output frequency. Control circuitry 1513, 1514 allows adjusting of the tuning current source to optimize bias current.