A Wide Range Tunable Pseudo-Differential OTA

In this paper, a novel tunable, highly linear pseudo-differential transconductance amplifier is presented. This transconductance exhibits a wide adjustability range in V-I conversion curve. In this design the input signal voltage is transferred to linear CMOS transistors in two ways. Interaction of transformations lead to eliminate two order factor of input signal, and creates high linearization in V-I conversion curve. The operational transconductance amplifier(OTA) was simulated in a .18μm CMOS TSMC technology, 3volt supply voltage and 2.1mw power consumption. High linearity of OTA is obtained from -1.5 to +1.5, and the transconductance changes from 1uA to 20uA.