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:
Oct. 16, 2001
Filed:
Nov. 17, 1999
Applicant:
Inventor:
John Matthew Muza, Plano, TX (US);
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K 5/00 ;
U.S. Cl.
CPC ...
H03K 5/00 ;
Abstract
A method and circuit (,) for tuning a G,/C filter. A first circuit portion includes a variable current source (,) having a plurality of transistors M,through M,coupled to switches SWA through SW,. The output capacitor C,is calibrated iteratively by compensating a calibration capacitor C,with the variable current source to tune the G,/C filter. The transconductance G,is dependent on a precision external resistor R,rather than on internal resistors of the G,/C filter. An algorithm (,) performs the iterative calibrations for the G,/C filter. The invention is particularly useful for mixed signal or analog circuits.