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A 0.3-V Pseudo-Differential Bulk-Input OTA for Low-Frequency Applications

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Abstract

This paper presents an ultra-low-voltage high-performance bulk-input pseudo-differential operational transconductance amplifier for low-frequency applications. The proposed amplifier is designed using standard 65-nm CMOS technology and powered from 0.3-V supply with a stand by current consumption of 170-nA. Post-layout simulations with a load capacitance of 5 pF have been performed to validate the performance of the proposed amplifier. The proposed amplifier exhibits a DC gain of 60 dB and a phase margin of 53\(^\circ \) at unity gain frequency of 70 kHz for a load of 5 pF. The proposed OTA has shown improvement of five times and more than 2.5 times in small-signal and large-signal performance, respectively, when compared to the state of the art. In addition, the proposed transconductance amplifier is used to design a tunable second-order \(G_m{\text {-}}C\) low-pass filter. Simulation results show that tunable cutoff frequency is varying from 4 to 190 kHz which is obtained by varying the input-stage bias current from 1 to 200 nA.

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Acknowledgements

The authors would like to thank Department of Electronics and Information Technology (DeitY), Government of India, for providing the software resources under the Special Manpower Development Program (Phase III and C2SD). The authors would also like to thank Dr. Arun Tej M. for his useful inputs in improving the paper. The authors wish to thank the reviewers for their useful suggestions.

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  1. Department of EEE, Indian Institute of Technology Guwahati, Guwahati, Assam, India

    Harikrishna Veldandi & Rafi Ahamed Shaik

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  1. Harikrishna Veldandi
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  2. Rafi Ahamed Shaik
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Correspondence to Harikrishna Veldandi.

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Veldandi, H., Shaik, R.A. A 0.3-V Pseudo-Differential Bulk-Input OTA for Low-Frequency Applications. Circuits Syst Signal Process 37, 5199–5221 (2018). https://doi.org/10.1007/s00034-018-0817-5

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  • DOI: https://doi.org/10.1007/s00034-018-0817-5

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