Low Voltage Adaptive Biased OTA with Enhanced Slew Rate and its application in Universal Filter

Low voltage low power operational transconductance amplifier (OTA) with enhanced slew rate and dc gain has been proposed in this work. The proposed OTA is implemented using Dynamic threshold MOS transistors (DTMOS) to unite both high transconductance and low voltage properties of DTMOS. Additionally, cross coupled positive feedback and adaptive bias circuit are used to provide enhanced dc gain and slew rate. The proposed OTA is designed with TSMC 180 nm CMOS technology using Mentor Graphics at ± 0.4V supply voltage. It achieves dc gain as 70.26 dB, gain-bandwidth as 1.21 MHz with rising/falling slew rates as +15.93V/μS/ −18.21 V/μS and CMRR as 76. 2SdB along with 0.044μW power dissipation. Besides, the universal MISO filter implemented using proposed OTA authenticates its competency. Furthermore, Monte Carlo and temperature analysis confirms its sturdiness against aspect ratio and temperature variations.