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Low Noise Elliptical Filter in 250 Nanometer Technology for EEG Signals

Arpit Tiwari, Anil Kumar Sahu


A low noise filter for low frequency is presented. 5th order elliptical Filter design using OTA-C method is low in noise and good to acquire biopotential signal in range of 40 Hz. Filter provides strong attenuation against power line interference which occurs due to power supply of a system. For achieving low noise and low transconductance, current division and current cancellation technique (CDCC) is applied.

Filters also have a total harmonic distortion of 1.6 % with 50 millivolt peak to peak signals. OTA used CDCC topology provide the low transconductance required for low frequency application. OTA work in sub threshold region with bias current of 300 Nano amperes and also have a tuning ability with vtune voltage and it is biased with simple current mirror. This entire circuit design in 250 nanometer technology with 2.5 volt power supply using T-SPICE simulator of tanner EDA 15. Bandwidth and noise of a filter is 38 Hz, 3.36µvolt/ respectively.


Current Division Current Cancellation (CDCC), Electronic Design Automation (EDA), Operational Transconductance Amplifier (OTA), Special Programed for Integrated Circuit Emphasis (SPICE).

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Ata Sarafinazhad ,Ismailkhan,FaikBaskaya “Design of a Digitally Tunable 5th order GM-C Filter Using Linearized OTA in 90nm CMOS Technology”, IEEE 2015.

K. Pratyusha, Sanjeev kumar, Anita kumari “Low power Amplifier for biopotential signal acquisition system”, IEEE International Conference on Advance in Computing and Informatics C 2015, pp 324-329

Tapsi Singh “Design and Analysis of CMOS Folded Cascode OTA using Gm/Id Technique” International Journal of Electronics and Computer Science Engineering 2014, pp.727-733, 2014

Rajeev kumar Ranjan, Surya PrasannaYalla, Shubham Sorya and Sajal K. Paul “Active Comb Filter Using Operational Trans-conductance Amplifier” Hindawai Publishing Corporation active passive component Volume, 2014, Article id 587932, 6 pages.

Mohammed Abdulaziz,Markus Tormanen,Henrik Sjoland “ A 4th orderm Gm-C filter with 10MHz bandwidth and 39 d Bm IIP3 IN 65nm CMOS” IEEE 2014 pp 367-370.

Kainan Wang, Chun-hsiang Chang, Marvin Onabajo “A Fully-Differential CMOS Low-Pass Notch Filter for Biosignal Measurement Devices with High Interference Rejection”IEEE 2014 pp 1041-1044.

SarehRigi, SaharChahkandi “An ultra-low-power CMOS OTA for low-frequency for Gm-C application” International Journal of Scientific Research engineering & technology 2014, Volume 2 Issue 11, pp. 792-797, 2014.

Chaodong Ling, PizhouYe, RongLiu, Jiaxian Wang “A Low Pass Power Notch Filter Based on an OTA-C Structure for Electroencephalogram” IEEE Proceedings of 2007 International Symposium on Intelligent Signal Processing and Communication Systems Nov 28.-Dec. 1,2007,Xiamen,China,pp.451-453

Xinbo Qian, Young Ping Xu, Xiaoping Li: “A CMOS Continuous Time Low Pass Notch Filter for EEG systems” Analog Integrated Circuit and Signal processing Springer Science 2005, Vol.44, pp.231-238

P.Bruschi, G.Barillaro, F.Pieri, M.Piotto “Temperature Stabilised Tunable Gm-C filter for Very Low frequencies” IEEE 2004 pp.107-110.

AnandVeeravalli, Edgar Sanchez-Sinencio, Jose Silva-Martinez: CMOS trans-conductance amplifier architecture with wide tuning range for very low frequency applications” IEEE journal of solid state circuit, Vol.37 No.6, June 2002, pp.1391-1397.

Sergio Solis-Bustos, Jose Sliva-Martinez, Edgar Sanchez-Sinencio “ A 60-d B dynamic-range CMOS sixth order 2.4- Hz Low pass filter for medical applications ” IEEE Transaction on Circuit and Systems Analog and digital signal processing volume 47 no 12 December 2000.

Qiuting Huang,Michael Oberle “A 0.5-m W Passive Telemetry IC for Biomedical Applications”, IEEE journal of Solid-State Circuit Vol.33 No.7.july 1998.

Chung-Chih, Kari A.I.Halonen, Mohammed Ismail,Veikko Porra “ A Low-Voltage, Low-Power CMOS 5th order Elliptical Gm-C Filter for Baseband Mobile, Wireless Communication”IEEE transaction on circuit and system for video technology ,Vol 7,No.4,august 1997

Bruno Stefanelli, Andreas Kaiser “A 2-µm CMOS Fifth Order Low Pass Continuous Time Filter for Video Frequency Applications” IEEE journal of Solid State Circuits Vol. No. 28, July 1993

Randall L.Geiger, Edgar Sanchez Sinencio “Active Filter Design Using Operational Transconductance Amplifiers: A Tutorials” IEEE Circuit and Devices Magazine 1985, Vol 1 pp.20-32.

P.V Ananda Mohan, “Current-Mode VLSI Analog Filters Design and Applications”, 2003.


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