Patent ID: 7339404

Claim:
A deglitch circuit for removing a glitch, the deglitch circuit comprising: a first inverter connected to a power supply line, which supplies power supply voltage, via a first current source and to a ground line via a second current source, the first inverter receiving an input signal; a capacitor connected to an output terminal of the first inverter and to the ground line; a first transistor including a source terminal, connected to the capacitor, and a drain terminal, connected to the power supply line via a third current source having a current value smaller than that of the second current source, the first transistor being biased at a first control voltage that is higher than ground potential; a second transistor including a source terminal, connected to the capacitor, and a drain terminal, grounded via a fourth current source having a current value smaller than that of the first current source, the second transistor being biased at a second control voltage that is lower than the power supply voltage; a second inverter having an input connected to the source terminal of the first transistor; a third inverter having an input connected to the drain terminal of the second transistor; and a latch circuit for receiving outputs from the drain terminals of the first and second transistors via the second and third inverters, respectively.