High-accuracy instrumentation amplifier for low voltage low power CMOS smart sensors

Author

Falconi, Christian ; Faccio, Marco ; D´Amico, Arnaldo ; Di Natale, Corrado

Author_Institution

Dept. of Electron. Eng., Univ. of Tor Vergata, Roma, Italy

Volume

3

fYear

2003

fDate

25-28 May 2003

Abstract

In low voltage low power CMOS systems both the high input offset and noise voltages of MOSFETs and also the moderate gain of op amps limit the accuracy of analog circuits. In this paper we present a new high-accuracy instrumentation amplifier; this circuit topology is the first ever reported "non-autozero" instrumentation amplifier which allows one to compensate, beside the input offset and noise voltages of the op amps, also the finite op amp gain. Furthermore, proper dynamic resistor matching may improve both the accuracy of the closed loop gain and the CMRR.

Keywords

CMOS analogue integrated circuits; error compensation; instrumentation amplifiers; intelligent sensors; low-power electronics; operational amplifiers; CMOS smart sensors; CMRR; closed loop gain; dynamic resistor matching; finite op amp gain; high-accuracy instrumentation amplifier; input offset; low power CMOS amplifier; low voltage CMOS amplifier; noise voltages; nonautozero instrumentation amplifier; Analog circuits; CMOS analog integrated circuits; Circuit noise; Circuit topology; High power amplifiers; Instruments; Intelligent sensors; Low voltage; MOSFETs; Operational amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on

Print_ISBN

0-7803-7761-3

Type

conf

DOI

10.1109/ISCAS.2003.1205074

Filename

1205074