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. 08, 2018
Filed:
Oct. 06, 2014
Applicant:
Texas Instruments Incorporated, Dallas, TX (US);
Inventors:
Peyman Hojabri, San Jose, CA (US);
Charles Yong Yi Guan, Pleasanton, CA (US);
Assignee:
TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 27/26 (2006.01); G01R 35/00 (2006.01);
U.S. Cl.
CPC ...
G01R 27/2605 (2013.01);
Abstract
A capacitance detection circuit detects changes in the capacitance of a variable capacitor by using the change in capacitance to change the resonant frequency of a variable capacitor oscillator. The resonant frequency of the variable capacitor oscillator is converted from the time domain to the frequency domain, and then selected frequencies values are compared to known frequency domain values to detect the magnitude of the change in capacitance.