Patent ID: 8179187

Claim:
A buck converter formed in a substrate, comprising: a P-channel Metal Oxide Semiconductor (PMOS) device formed in a p-type substrate and having a first n-type well, wherein a driver signal is input to a gate of the PMOS device; a N-channel Metal Oxide Semiconductor (NMOS) device formed in the p-type substrate and having a second n-type well and a first p-type well in the second n-type well, wherein the driver signal is input to a gate of the NMOS device, and wherein the PMOS device and the NMOS device are coupled with each other in series between a voltage source and a GND; and a capacitor connected to a first node connected between the PMOS device and the NMOS device, and the GND, respectively, the capacitor adapted to generate close-magnitude noises with opposite phases at a second node located between the PMOS device and the voltage source and at a third node located between the NMOS device and the GND.