Design of 0.5V Electro-cardiography

전원전압 0.5V에서 동작하는 심전도계

  • Received : 2016.03.10
  • Accepted : 2016.03.28
  • Published : 2016.07.31


In this paper, electrocardiogram (ECG) analog front end with supply voltage of 0.5V has been designed and verified by measurements of fabricated chip. ECG is composed of instrument amplifier, 6th order gm-C low pass filter and variable gain amplifier. The instrument amplifier is designed to have gain of 34.8dB and the 6th order gm-C low pass filter is designed to obtain the cutoff frequency of 400Hz. The operational transconductance amplifier of the low pass filter utilizes body-driven differential input stage for low voltage operation. The variable gain amplifier is designed to have gain of 6.1~26.4dB. The electrocardiogram analog front end are fabricated in TSMC $0.18{\mu}m$ CMOS process with chip size of $858{\mu}m{\times}580{\mu}m$. Measurements of the fabricated chip is done not to saturate the gain of ECG by changing the external resistor and measured gain of 28.7dB and cutoff frequency of 0.5 - 630Hz are obtained using the supply voltage of 0.5V.


ECG Electro-cardiography;ECG;Instrumentation Amplifier;gm-C filter;Variable gain amplifier


  1. Y. J. Nam and K. M. Park, "Development of a Portable Digital Electrocardiograph(ECG) measurable with Gel-less Metal Electrodes" JKAIS, vol. 14, no.4, pp. 1903-1907, 2013.
  2. S. I. Lim, "Review of bio-signal processing chips," Review of KIISC, vol. 17, no. 1, pp. 38-46, Feb. 2009.
  3. S. I. Lim, "Bio-medical chip design technology," Journal of IEEK, vol. 37, no. 10, pp. 48-62, August 2010.
  4. H. G. Cho and S. I. Lim, "Design of instrument amplifier for bio-signal measurements," in Proc. of IEEK SoC Conference 2009, pp. 85-88, May 2009.
  5. J. C. Baek, Analog Filter and Op Amp, Seongnam, SyncWorks, 2002.
  6. S. B. Park, Design of Analog IC Filter, Seoul, HongRung Publishing, 1999.
  7. S. H. Bae, S. I. Cho, S. I. Lim and B. S. Mun, "Design of bandpass filter for body composition analysis," Journal of IEEK, vol. 42, no. 5, pp. 43-50, Sept. 2005.
  8. A. Veeravalli, E. Sanchez-Sinencio, and J. Silva-Martinez, "Transconductance amplifier structures with very small transconductances: a comparative design approach," IEEE J. Solid-State Circuits, vol. 37, no. 6, pp. 770-775. June 2002.
  9. I. Fujimori and T. Sugimoto, "A 1.5 V, 4.1 mW dual-channel audio delta-sigma D/A converter," IEEE J. Solid-State Circuits, vol. 33, no. 12, pp. 1863-1870. December 1998.
  10. B. Razavi, Design of analog CMOS integrated circuits, New York, NY: McGraw-Hill, 2003.


Supported by : Chungbuk National University