Patent ID: 6933760

Claim:
A hysteresis circuit, comprising: a sensing amplifier to generate an output signal having an output and two inputs with one of the inputs coupled to an input signal; a reference generator coupled to the output and the other one of the inputs of the sensing amplifier and responsive to the output signal to generate an output reference voltage; the reference generator including a first originator circuit to generate a first reference voltage on a first reference voltage node; a second originator circuit to generate a second reference voltage on a second reference voltage node; a selector circuit coupled to the first and second originator circuits to provide as the output reference voltage either the first or second reference voltage based upon the output signal undertaking a falling signal transition or a rising signal transition respectively; a voltage supply; and a ground; the first originator circuit including a first p-channel device and a second p-channel device coupled in parallel between the voltage supply and the first reference voltage node; and the second originator circuit including a first n-channel device and a second n-channel device coupled in parallel between the second reference voltage node and the ground.