Patent ID: 8063675

Claim:
A delay circuit comprising: a first internal delay circuit and a second internal delay circuit which respectively receive an input signal and an inverted input signal; and a selector which outputs an output signal whose outset and end are defined respectively by a delayed outset of the input signal and a delayed end of the input signal supplied from the first and second internal delay circuits, the first and second delay circuits being of an identical construction each comprising: a first inverter arranged between a first current source and a ground and comprising a charge switch and a discharge switch which function inversely to each other; a capacitor being in direct connection to the first current source via the charge switch and to the ground via the discharge switch, such that the capacitor exhibits, during charging thereof, a rising voltage which is a function of only a capacitance of the capacitor and a current supplied from the first current source; and a constant current inverter which defines a threshold for detecting the rising voltage of the capacitor, wherein the constant current inverter comprises a second current source and a sensor switch driven by the second current source to operate when the rising voltage of the capacitor crosses the threshold.