A ۰.۵V, ۹۰۰uW CMOS OTA Using Bulk Driven and Hybrid Compensation Technique

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 ۰.۱۸µm CMOS technology. The simulation results show that the amplifier has a ۸۴.۱dB open-loop DC gain and a unity gain-bandwidth of ۸۱ KHz while operating at ۰.۵V supply voltage. The total power consumption is as low as ۹۰۰nW which makes it suitable for low-power bio-medical applications.

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