A voltage-to-time converter (VTC) circuit includes an input capacitor being charged according to an input voltage during a precharge operation; an output capacitor being charged during the precharge operation; a first transistor configured to discharge the output capacitor according to a voltage charged in the input capacitor during a first operation following the precharge operation; and a second transistor configured to charge the output capacitor according to the voltage charged in the input capacitor during a second operation following the first operation.