Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 4, 2007
Patent Application Number
11533023
Date Filed
September 19, 2006
Patent Primary Examiner
Patent abstract
A charge pump circuit includes a test mode control unit for generating a plurality of control signals according to a test mode enable signal and an input signal and fixing one of the plurality of the control signals depending upon whether a fuse has been cut or not, a ring oscillator for outputting an output frequency of which varies according to an output of the test mode control unit, and a charge pump for generating a high voltage, which is higher than an external voltage, according to an output of the ring oscillator.
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