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:
Aug. 15, 2006
Filed:
Sep. 01, 2005
Sang-chuel Lee, Gyeonggi-do, KR;
Sang-Chuel Lee, Gyeonggi-do, KR;
AD Semiconductor Co., Ltd., Seoul, KR;
Abstract
A method and an integrated circuit for detecting capacitance variation includes the steps of: generating a detection frequency for capacitance variation and a detection frequency which lags the detection frequency by k times, wherein the detection frequencies are based on a time divisional format; operating the detection frequencies to produce a difference frequency; operating variation rate of the difference frequency; and comparing the variation rate of the difference frequency with a predetermined detection level, and outputting a signal indicative of capacitance variation if the variation rate of the difference frequency is greater than the detection level.