An ultra low-voltage CMOS OTA Miller with rail-to-rail operation

This work describes a simple topology for implementing a low voltage rail-to-rail CMOS Miller OTA with differential pair using bulk driven and DC shifters. Since the transistors work on weak inversion, the topology requires a 600 mV power supply and consumes only 420 nW on the 0.35 /spl mu/m TSMC CMOS process. The voltage swing and the frequency response are almost independent of the power supply voltage that can change from 600 mV to 3.3 V (limit of this technology).