A low noise CMOS amplifier for ENG signals

Author

Uranga, A. ; Lago, N. ; Navarro, X. ; Barniol, N.

Author_Institution

Dept. of Electron. Eng., Univ. Autonoma de Barcelona, Bellaterra, Spain

Volume

4

fYear

2004

fDate

23-26 May 2004

Abstract

The development of an integrated amplifier, intended to record electrical signals from extracellular peripheral nerves, using cuff electrodes, is presented. In order to minimize the flicker noise generated by the CMOS circuitry, a chopper full differential amplifier is implemented. The amplifier has a gain of 74 dB, a bandwidth of 3 kHz and a power dissipation of 1.3 mWatts, with 5 V power supply. Equivalent input-referred noise level of 6.6 nV/(Hz)^0.5 has been achieved, obtaining a noise efficiency factor of 5.3, which is clearly competitive, compared with other developed recording amplifiers reported in the literature. The amplifier has been fabricated with a fully CMOS 0.7 μm technology (one poly, two metals, self aligned twin-well CMOS process) and the active area is 2.7 mm². In vivo nerve recordings are provided to demonstrate the feasibility of the amplifier.

Keywords

CMOS integrated circuits; differential amplifiers; electromyography; flicker noise; neurophysiology; preamplifiers; 0.7 micron; 3 kHz; 5 V; 74 dB; CMOS circuitry; ENG signals; chopper full differential amplifier; electrical signal recording; extracellular peripheral nerves; flicker noise generation; integrated amplifier; low noise CMOS amplifier; noise efficiency factor; power dissipation; 1f noise; CMOS process; CMOS technology; Choppers; Circuits; Differential amplifiers; Electrodes; Extracellular; Low-noise amplifiers; Noise level;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328930

Filename

1328930