Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 20, 2007
Patent Application Number
10144928
Date Filed
May 15, 2002
Patent Primary Examiner
Patent abstract
A circuit for detecting whether an intermittent clock waveform signal of 50 MHz is received or not includes an offset receiver, a charge pump, a capacitor and a hysteresis comparator. A circuit for detecting whether a random data waveform signal of 500 MHz is received or not includes an offset-less receiver, a transition counter, a delay circuit and an AND circuit. An OR circuit outputs as a signal detection signal a signal indicating the OR operation result of respective outputs of the hysteresis comparator and the AND circuit.
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