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Power Efficient Fully Differential Bulk Driven OTA for Portable Biomedical Application

Electronic Engineering Department, NED University of Engineering and Technology, Karachi 75270, Pakistan
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Electronics 2018, 7(3), 41; https://doi.org/10.3390/electronics7030041
Received: 19 February 2018 / Revised: 13 March 2018 / Accepted: 16 March 2018 / Published: 20 March 2018
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Abstract

This paper presents a power efficient, bulk driven, source degenerated fully differential operational transconductance amplifier (OTA), operating in the subthreshold region. The input part of the OTA consists of a bulk driven source degenerated differential pair and cross coupled transistors to improve the linearity of OTA. It consists of a bulk driven pair to reduce the supply voltage and to improve the linearity. The proposed fully differential OTA has utilized self-cascode current mirror loads which increases the output impedance and hence the overall intrinsic gain. A subthreshold region is adopted to reduce the power consumption of the circuit. For a 200 mVpp sinusoidal input at 100 Hz, a total harmonic distortion (THD) of −58.56 dB is achieved. The gain, gain bandwidth (GBW), phase margin (PM) and gain margin (GM) values obtained were 48.4 dB, 3.1 KHz, 80° and 19.01 dB, respectively. The common mode rejection ratio (CMRR), power supply rejection ratio (PSRR) and slew rate +/− values were 146.3 dB, 83 dB and 99.56/100 V/ms, respectively. The circuit is capable of operating under a supply voltage of 0.8 V with a power consumption of 59.04 nW, which proves that the circuit is suitable for portable biomedical devices. The proposed circuit is simulated in CADENCE environment virtuoso using LFoundry 150 nm Complementary metal oxide semiconductor (CMOS) process technology. View Full-Text
Keywords: power efficient; source degenerated; fully differential; portable devices; bulk driven; self cascode; total harmonic distortion power efficient; source degenerated; fully differential; portable devices; bulk driven; self cascode; total harmonic distortion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Bano, S.; Narejo, G.B.; Ali Shah, S.M.U. Power Efficient Fully Differential Bulk Driven OTA for Portable Biomedical Application. Electronics 2018, 7, 41.

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