A Subhertz Nanopower Low-Pass Filter

被引：42

作者：

Rodriguez-Villegas, Esther ^{[1
]}

Casson, Alexander J. ^{[1
]}

Corbishley, Phil ^{[2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Circuits & Syst Res Grp, Dept Elect & Elect Engn, London SW7 2AZ, England

[2] Nord Semicond, N-7052 Trondheim, Norway

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2011年 / 58卷 / 06期

基金：

欧洲研究理事会;

关键词：

Analog filtering; biomedical signal conditioning; clocked transconductor; low power; LOW-FREQUENCY; DESIGN; SIGNAL; RANGE;

D O I：

10.1109/TCSII.2011.2158165

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This brief presents a first-order low-pass filter topology capable of providing cutoff frequencies down to 2 mHz with power consumption of 5 nW. The circuit is intended for signal conditioning applications, particularly for use with very low frequency physiological signals in low-power portable medical equipment. To achieve a low-frequency cutoff, the filter is based around the use of a clocked transconductor, which provides low transconductance while using a relatively high bias current level. The circuit is implemented in a 0.35-mu m technology with a 1-V supply and has 32-mu V-RMS measured noise and a 64-dB dynamic range. In terms of power consumption and cutoff frequency the reported filter outperforms previous filters from the literature.

引用

页码：351 / 355

页数：5

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