A 0.5V, 900uW CMOS OTA Using Bulk Driven and Hybrid Compensation Technique

Subject Areas : Majlesi Journal of Telecommunication Devices

Seyedeh Sara Hassani ¹ , Abbas Golmakani ²

1 - Department of Electrical Engineering, Sadjad Institute for Higher Education, Mashhad, Iran
2 - Department of Electrical Engineering, Sadjad Institute for Higher Education, Mashhad, Iran

Received: 2014-02-26 Accepted : 2014-02-26 Published : 2014-06-01

Keywords: en,

Abstract :

Abstract— An ultra-low-voltage ultra-low-power operational transconductance amplifier (OTA) is presented in this paper. The proposed topology based on a bulk driven input differential pair. Two separate capacitors have been used for compensation of the opamp where one of them is used in a signal path and another one in a non-signal path. The circuit is designed in the 0.18µm CMOS technology. The simulation results show that the amplifier has a 84.1dB open-loop DC gain and a unity gain-bandwidth of 81 KHz while operating at 0.5V supply voltage. The total power consumption is as low as 900nW which makes it suitable for low-power bio-medical applications.

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