Low Noise and Low Distortion Telescopic OTA for Biomedical Signal Processing

Author(s): Zuber M. Patel*

Journal Name: Recent Advances in Electrical & Electronic Engineering
Formerly Recent Patents on Electrical & Electronic Engineering

Volume 12 , Issue 6 , 2019

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Graphical Abstract:


Background: This paper presents a low noise and low distortion telescopic Operational Trans-conductance Amplifier (OTA) that is suited to biomedical signal processing. In our proposal, source degeneration using CMOS transmission gate is introduced in telescopic OTA to realize current- voltage negative feedback. The negative feedback degenerates Gm, reduces flicker noise and reduces distortion.

Methods: The circuit is simulated by using TSMC 90nm CMOS process technology with 1.8V supply voltage. We obtained promising simulation results that show THD less than -90dB and flicker noise 60 nV at 4kHz corner frequency.

Results: The frequency response plot reveals that our circuit offers a voltage gain of 63dB with negative feedback and achieves a phase margin of about 70 degrees. Thus, this topology is a feasible solution for low noise and low distortion biomedical signal amplifier circuits.

Conclusion: A highly linear and low noise telescopic OTA topology was proposed in this paper. A simple but efficient technique of source degeneration is used with negative feedback to achieve low distortion and low noise.

Keywords: Low distortion, source degeneration, flicker noise, telescopic OTA, THD, noise and nonlinearity.

Texas Instruments. OPA167x Low-Distortion Audio Opamp. Available from:, http://www.ti.com/lit/ds/symlink/opa1678.pdf
M. Akbari, and O. Hashemipour, "Design and analysis of folded cascode OTAs using Gm/Id methodology based on flicker noise reduction", Springer J. Analog Integ. Circ. Sig. Process., vol. 83, no. 3, pp. 343-352, 2015.
J. Ou, and P.M. Ferreira, "“A gm/ID-based noise optimization for CMOS folded-cascode operational amplifier”, IEEE Transact. Circ. Syst.-", II: Express Brief., vol. 61, no. 10, pp. 783-787, 2014.
B. Saidulu, A. Manoharan, and K. Sundaram, "“Low noise low power CMOS telescopic-OTA for bio-medical application”, MDPI", J. Comput., vol. 5, no. 25, 2016.
K. Yaohui, L. Airong, and Y. Huazhong, "A highly linear lowvoltage source-degeneration transconductor based on unity-gain buffer", Tsinghua Sci. Technol., vol. 14, no. 6, pp. 698-702, 2009.
M. Akbari, S. Biabanifard, and S. Asadi, "Input referred noise reduction technique for transconductance amplifiers", Elec. Comput. Eng.: Inter. J. (ECIJ), 2015, vol. 4, no. 4, pp. 11-23, .
T. Yang, and J. Holleman, "An ultralow-power low-noise CMOS biopotential amplifier for neural recording", IEEE Trans. Circ. Syst.-II: Express Briefs, vol. 62, no. 10, 2015.
W. Wattanapanitch, M. Fee, and R. Sarpeshkar, "An energyefficient micropower neural recording amplifier", IEEE Trans. Biomed. Circuits Syst., vol. 1, no. 2, pp. 136-147, 2007.
C. Qian, J. Parramon, and E.S.- Sinencio, "Micropower low-noise neural recording front-end circuit for epileptic seizure detection", IEEE J. Solid-State Cir, vol. 46, no. 6, pp. 1392-1405, 2011.
S. Pennisi, "High-performance CMOS current feedback operational amplifier", In: Proceedings of IEEE International Symposium on Circuits and Systems, Kobe, Japan, 2005.
J. Holleman, and B. Otis, "A sub-microwatt low-noise amplifier for neural recording", In: Proceedings of the 29th Annual International Conference of the IEEE EMBS, Lyon, France, 2007.
A.B. Rezaeii, S. Mahdavi, K. Dadashi, and T. Moradi, "Novel feedback architecture in folded cascode amplifier for high-linearity high-resolution applications qualified for different corners", In: 1st International Conference on New Research Achievements in Electrical and Computer Engineering, 2016.
X. Chen, and J. Xing, "A compact output stage for low-power low distortion amplifier with diode negative feedback", In: Proceedings of IEEE International Conference on Anti-Counterfeiting Security and Identification in Communication (ASID), China, 2010.
B. Razavi, "Design of Analog CMOS Integrated Circuits", Tata McGraw-Hill Edition, 2002,
K. Gulati, and H.S. Lee, "A high-swing CMOS telescopic operational amplifier”, IEEEJ. Solid-State Cir, vol. 33, no. 12, 1998.
K. Abdelhalim, and R. Genov, "Compact chopper-stabilized neural amplifier with low-distortion high-pass filter in 0.13um CMOS", In: Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Seoul, South Korea, 2012.
User Guide. HSPICE Integration to Cadence Virtuoso Analgo Design Environment. Synposys, Version E-2010.12, Dec. 2010,

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Article Details

Year: 2019
Published on: 22 November, 2019
Page: [507 - 512]
Pages: 6
DOI: 10.2174/2352096511666180705115436
Price: $25

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