Design of current mode instrumentation amplifier for portable biosignal acquisition system

Author

Li, Jin Tao ; Pun, Sio Hang ; Vai, Mang I. ; Mak, Peng Un ; Mak, Pui In ; Wan, Feng

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Macau, Macau, China

fYear

2009

fDate

26-28 Nov. 2009

Firstpage

9

Lastpage

12

Abstract

This paper describes the design of current mode instrumentation amplifier (CMIA) for portable biosignal acquisition system. The CMIA topology is based on voltage mode operational amplifier (op amp) power supply current sensing technique. Op amp mismatch and precise current mirrors are two design challenges of this topology. A simulation analysis is conducted based on an implementation in a CMOS 0.35 Â¿m technology. The CMIA consumes 20.22 Â¿W under a 3 V DC power supply and has a continuous adjustable gain bandwidth product (GBW)-independent voltage gain via single resistor. The CMRR is higher than 120 dB up to 1 Hz and more than 80 dB up to 100 Hz.

Keywords

CMOS integrated circuits; bioelectric phenomena; biomedical measurement; data acquisition; operational amplifiers; power supplies to apparatus; signal detection; CMIA design; CMIA topology; CMOS technology; CMRR; DC power supply; continuous adjustable gain bandwidth product independent voltage gain; current mirrors; current mode instrumentation amplifier; op amp mismatch; operational amplifier; portable biosignal acquisition system; power 20.22 muW; voltage 3 V; voltage mode op amp power supply current sensing technique; Analytical models; CMOS technology; Current supplies; Instruments; Mirrors; Operational amplifiers; Power amplifiers; Power supplies; Topology; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Circuits and Systems Conference, 2009. BioCAS 2009. IEEE

Conference_Location

Beijing

Print_ISBN

978-1-4244-4917-0

Electronic_ISBN

978-1-4244-4918-7

Type

conf

DOI

10.1109/BIOCAS.2009.5372096

Filename

5372096