Abstract: A integrated circuit includes a first, a second, a third, and a fourth gate, a first input pin and a first conductor. The first and third gate are on a first level. The second and fourth gate are on a second level. The second gate is coupled to the first gate. The fourth gate is coupled to the third gate. The first input pin extends in a second direction, is on a first metal layer above a front-side of a substrate, is coupled to the first gate, and configured to receive a first input signal. The first input pin is electrically coupled to the third gate by the first, second or fourth gate. The first conductor extends in the first direction, is on a second metal layer below a back-side of the substrate, and is coupled to the second and fourth gate.