Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 15, 2006
Patent Application Number
11216089
Date Filed
September 1, 2005
Patent Primary Examiner
Patent 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.
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