Patent ID: 8193849

Claim:
An apparatus comprising: a center-swing signal generator circuit including a first n-type metal oxide semiconductor (NMOS) transistor and a first p-type metal oxide semiconductor (PMOS) transistor coupled in parallel to each other, the first NMOS transistor and the first PMOS transistor disposed between a reference voltage location and an output, a gate of the first NMOS transistor coupled to the reference voltage location and a gate of the PMOS transistor coupled to the output; and a second NMOS transistor and a second PMOS transistors coupled in series to each other, the second NMOS transistor and the second PMOS transistor disposed between a first switch and a second switch, the first switch coupled to the reference voltage location and the second switch coupled to the output, gates of the second NMOS transistor and the second PMOS transistors coupled to drains of the first NMOS transistor and the first PMOS transistor.