A 1.1-V 40-nm CMOS High Linearity Voltage Follower with Improved CM Input Range

This paper presents a novel voltage follower, which is implemented in a 40nm CMOS process and under a supply of 1.1-V. In order to adapt to limited headroom, a low-threshold PMOS is used as the input transistor, and a novel low-voltage current source is proposed. Hence, high linearity and improved common-mode input range is obtained. The OIP3 reaches 28.7 dBm, and the common-mode input range is 0~790 mV.