An Ultra Low Power Low Noise Chopper Amplifier for Wireless BEG

Author

Yates, David C. ; Rodriguez-Villegas, Esther

Author_Institution

Dept. of Electr. & Electron. Eng., Imperial Coll. London, London

Volume

2

fYear

2006

fDate

6-9 Aug. 2006

Firstpage

449

Lastpage

452

Abstract

The realisation of wireless EEG systems suitable for long term monitoring requires low noise, low power and low voltage circuit design. Presented in this paper is a 1 V, 1.4 muW chopper amplifier implemented in a 0.35 mum CMOS process. The achieved input referred noise voltage is 1.5 muV rms and the gain is 44 dB. Since the dynamic range of the input EEG signal is dominated by the offset voltage generated at the electrode-tissue interface, a novel input high pass filter has been designed. The required filter capacitance is limited to 40 pF by recognising that the input chopper switches can be combined with the amplifier input capacitance to emulate a large resistance.

Keywords

CMOS integrated circuits; biomedical electronics; choppers (circuits); electroencephalography; high-pass filters; low noise amplifiers; low-power electronics; CMOS process; chopper amplifier; chopper switches; electrode-tissue interface; filter capacitance; high pass filter; low noise amplifier; low voltage circuit design; power 1.4 muW; size 0.35 mum; ultra low power amplifier; voltage 1 V; wireless EEG system; CMOS process; Capacitance; Choppers; Circuit noise; Circuit synthesis; Electroencephalography; Filters; Low voltage; Low-noise amplifiers; Monitoring;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2006. MWSCAS '06. 49th IEEE International Midwest Symposium on

Conference_Location

San Juan

ISSN

1548-3746

Print_ISBN

1-4244-0172-0

Electronic_ISBN

1548-3746

Type

conf

DOI

10.1109/MWSCAS.2006.382309

Filename

4267387