Research PaperNo Access

A New Capacitance Multiplier Structure with High Multiplication Factor for Ultra-Low-Frequency Filter in Biomedical Applications

http://orcid.org/0000-0003-1962-1619

School of Applied Science, Beijing Information, Science and Technology University, No. 12 Xiaoying East Road, Qinghe, Haidian District, Beijing 100192, P. R. China

E-mail Address: ly_5100@126.com

Corresponding author.

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Yong Liang Li

Integrated Circuit Advanced Process Center, Institute of Microelectronics, Chinese Academy of Sciences, 3 Beitucheng West Road, Chaoyang District, Beijing 100029, P. R. China

E-mail Address: liyongliang@ime.ac.cn

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https://doi.org/10.1142/S0218126620501091Cited by:5 (Source: Crossref)

Abstract

A novel capacitance multiplier is proposed to implement an ultra-low-frequency filter for physiological signal processing in biomedical applications. With the proposed multiplier, a simple first-order low-pass filter achieves a $-$ 3-dB frequency of 33.4μHz with a 1-pF capacitance and a 20k $Ω$ resistance. This corresponds to a multiplication factor of as large as $2.4 \times 1 0^{11}$ . By changing the controlling terminal, the $-$ 3-dB frequency can be tuned in a wide range of 33.4μHz–6.3kHz.

This paper was recommended by Regional Editor Piero Malcovati.

Keywords:

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