A CMOS low-noise instrumentation amplifier using chopper modulation

被引：21

作者：

Nielsen, JH ^{[1
]}

Bruun, E ^{[1
]}

机构：

[1] Tech Univ Denmark, Orsted DTU, Orsted, Denmark

来源：

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 2005年 / 42卷 / 01期

关键词：

neural sensor; implantable microsystem; low-noise; low-power; chopper modulation;

D O I：

10.1023/B:ALOG.0000042329.18883.8a

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper describes a low-power, low-noise chopper stabilized CMOS instrumentation amplifier for biomedical applications. Low thermal noise is achieved by employing MOSTs biased in the weak/moderate inversion region, whereas chopper stabilization is utilized to shift 1/f-noise out of the signal band hereby ensuring overall low noise performance. The resulting equivalent input referred noise is approximately 7 nV/rootHz for a chopping frequency of 20 kHz. The amplifier operates from a modest supply voltage of 1.8 V, drawing 136 muA of current thus consuming 245 muW of power. The gain is 72.5 dB over a 4 kHz bandwidth. The inband PSRR is above 90 and the CMRR exceeds 105 dB.

引用

页码：65 / 76

页数：12

共 19 条

[1] A CMOS nested-chopper instrumentation amplifier with 100-nV offset [J].

Bakker, A ;

Thiele, K ;

Huijsing, JH .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2000, 35 (12) :1877-1883

[2]

DAGTEKIN M, 2001, P 23 EMBS INT C TURK, V1, P757

[3] AN ANALYTICAL MOS-TRANSISTOR MODEL VALID IN ALL REGIONS OF OPERATION AND DEDICATED TO LOW-VOLTAGE AND LOW-CURRENT APPLICATIONS [J].

ENZ, CC ;

KRUMMENACHER, F ;

VITTOZ, EA .

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, 1995, 8 (01) :83-114

[4] Circuit techniques for reducing the effects of op-amp imperfections: Autozeroing, correlated double sampling, and chopper stabilization [J].

Enz, CC ;

Temes, GC .

PROCEEDINGS OF THE IEEE, 1996, 84 (11) :1584-1614

[5] A very low voltage bipolar op-amp for sensor applications [J].

Ferri, G ;

Faccio, M ;

Stochino, G ;

D'Amico, A ;

Rossi, D ;

Ricotti, G .

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, 1999, 20 (01) :11-23

[6]

Gudnason G, 2001, ICECS 2001: 8TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS, VOLS I-III, CONFERENCE PROCEEDINGS, P397, DOI 10.1109/ICECS.2001.957763

[7] A low-power low-noise CMOS amplifier for neural recording applications [J].

Harrison, RR ;

Charles, C .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2003, 38 (06) :958-965

[8]

HAUGLAND MK, 1994, THESIS U AALBORG

[9] CMOS front-end amplifier dedicated to monitor very low amplitude signal from implantable sensors [J].

Hu, YM ;

Sawan, M .

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, 2002, 33 (01) :29-41

[10]

Huang HZ, 1999, 42ND MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, PROCEEDINGS, VOLS 1 AND 2, P170

← 1 2 →