An amplifier is provided having a first mixed-length MOS device set for receiving an input signal and outputting an output signal, and a first load for providing termination for the output signal, wherein the first mixed-length MOS device set comprises a parallel connection of a plurality of MOS devices having different channel lengths including at least a short channel length MOS device and a long channel length MOS device. In one configuration, a threshold voltage of the short channel length MOS device is greater than a threshold voltage of the long channel length MOS device. A related method is also provided.