Analysis and implementation of a fourth-order bandpass filter for R-wave detection of an implantable cardiac microstimulator

Shuenn-Yuh Lee, Ming Chun Liang, Tsung Heng Tsai, Wei Chun Kao

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

This paper presents an ultra-low-power fourth-order bandpass operational transconductance amplifier-C (OTA-C) filter for an implantable cardiac microstimulator used to detect the R-wave of intracardiac electrograms. The OTA-C filter fabricated by TSMC 0.35-μm complementary metal-oxide- semiconductor (CMOS) technology is operated in the subthreshold region to save power under a supply voltage of 1 V. The current cancellation technique is adopted to reduce the transconductance of the amplifier. Through this, the low-frequency OTA-C filter can be realized by ultra-low transconductance with on-chip capacitors. Direct comparison to conventional RLC ladders replaced by OTA-C circuits shows that the method of reducing the number of OTAs further diminishes power consumption. Design issues, including ultra-low transconductance, linearity, and noise, are also discussed. Measurement results show that the low-voltage, low-power filter has a bandwidth between 10 and 50 Hz, third inter-modulation distortion of -40 dB, dynamic range of 43 dB, and power consumption of only 12 nW. The real electrocardiography signal is fed into the bandpass filter to verify the function of signal processing with the distribution of the R-wave.

原文English
頁(從 - 到)1188-1202
頁數15
期刊International Journal of Circuit Theory and Applications
41
發行號11
DOIs
出版狀態Published - 2013 十一月 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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