Design and Simulation of Two Stage OTA using 0.18μm and 0.35μmTechnology
Hitesh Modi1, Nilesh D. Patel2
1Hitesh Modi, Electronics and Communication Department College LCIT, Bhandu and Gujarat Technological University, Ahmedabad, India.
2Nilesh D. Patel, Electronics and Communication, Gujarat Technological University, Mehsana, India.
Manuscript received on January 14, 2013. | Revised Manuscript received on February 05, 2013. | Manuscript published on February 28, 2013. | PP: 445-448 | Volume-2 Issue-3, February 2013.  | Retrieval Number: C1176022313/2013©BEIESP

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Abstract: The OTA is an amplifier whose differential input voltage produces an output current. Thus, it is a voltage controlled current source. Operational transconductance amplifier is one of the most significant building-blocks in integrated continuous-time filters. Here we design a two stage operational transconductance amplifier in TSMC 0.18μm and 0.35μm technology with all the transistor in the saturation region. The simulated output frequency response is shown for a supply voltage of 1.8V and 3.3V using IC studio in Mentor Graphics. DC gain is 47.86dB and 46.75dB, power consumption is 2mW and 3.2mW and slew rate is 37.58 V/μs and 31.67 V/μs for 1.8V and 3.3V respectively.
Keywords: Two stage operational transconductance amplifier, CMOS analog integrated circuits, Gain and Phase Margin.