A signal-generating circuit includes a first P-type transistor, a second P-type transistor, a first N-type transistor, a second N-type transistor, a first inverter, a second inverter, and a third inverter. The first P-type transistor supplies a supply voltage to a first node according to an input signal. Both of the second P-type transistor and the first N-type transistor couple the first node to a second node according to the input signal. The second N-type transistor couples the first node to a ground according to the input signal. The first inverter is coupled to the second node to generate a first signal. The second inverter is coupled between the first node and a third node. The third inverter is coupled to the third node to generate a second signal. The second signal and the first signal are the reverse of each other and synchronous.