Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Chih-Chang Chien0
Date of Patent
July 17, 2007
0Patent Application Number
114195060
Date Filed
May 21, 2006
0Patent Primary Examiner
Patent abstract
A digitizer and a related charge pump are provided. The charge pump includes an input coupled to the output of the comparator and receiving the output of the comparator as a control signal of charging and discharging, three current sources, and three switches, each of which having an end coupled to one of the current sources and another end selectively coupled to one of the differential outputs of the charge pump according to the output signal of the comparator. The charging and discharging currents of the charge pump are essentially identical. Hence there is no need to adopt calibration circuit for calibrating the PN current mismatch.
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