In one embodiment, a circuit such as a comparator circuit includes a differential stage adapted to receive a differential input signal and first and second diodes coupled to the differential stage. The first and second diodes are adapted to selectively switch on and off to provide a differential output signal at first and second differential output nodes in response to the differential input signal. The circuit may include an output stage coupled to the first and second diodes at the first and second differential output nodes, with the output stage adapted to convert the differential output signal to a single ended output signal. The circuit may also include a current source adapted to selectively provide a reference current to the first or second diode in an off state to reduce voltage swing of the first or second diode between the off and an on state.