Journal of Electronic Systems Siddharth Bhat, Shubham Choudhary, Jayakumar Selvakumar 6 3 2016 In this paper, we have a designed a low voltage CMOS operational transconductance amplifier (OTA) for high speed transmission with an operating voltage 0.5 V. The transistors are operating in the sub-threshold region with source degeneration for transconducatnce improvement. The OTA achieves a DC gain (Ao) of 26 dB, a gain-bandwidth product (GBW) of 750 MHz, slew rate (SR) of of 3.7 V s, a phase margin (PM) of 98º, DC offset of 2.2 mV and a power dissipation of 250 W under no load condition The proposed OTA is simulated in 90-nm CMOS technology using Cadence EDA software.