 output signal representative of the input signal. A first pair of transistor switches alternately raises and lowers a voltage potential of a first terminal of a reactive element upon switching of the first pair of transistor switches; a second pair of transistor switches alternately raises and lowers a voltage potential of the first terminal of the reactive element upon switching of the second pair of transistor switches; a switch controller controls switching of the first and second pairs of transistor switches in accordance with the input signal for forming 