A CMOS readout amplifier for instrumentation applications

Author

Schoeneberg, U. ; Hosticka, B.J. ; Schnatz, F.V.

Author_Institution

Fraunhofer-Inst. of Microelectron. Circuits & Syst., Duisburg, Germany

Volume

26

Issue

7

fYear

1991

fDate

7/1/1991 12:00:00 AM

Firstpage

1077

Lastpage

1080

Abstract

An integrated readout amplifier for instrumentation applications in smart sensor systems is presented. A fully integrated CMOS version of such an amplifier has been developed using switched-capacitor techniques. The amplifier system provides differential input capability, programmable amplification, clock generation, and low-pass filtering on the chip. The output signal is continuous in time and the system can be used without any of the special precautions necessary for sampled-data circuits. Emphasis was put on high PSRR (-63 dB at DC), low noise (10-μV_rms input equivalent wideband noise) and offset, low harmonic distortion, and small amplification error (<0.06% at 4 V_pp). To cover a large field of applications, only slightly different realizations can be used for capacitive sensors as well as for resistive sensor bridges

Keywords

CMOS integrated circuits; instrumentation amplifiers; linear integrated circuits; switched capacitor networks; CMOS readout amplifier; clock generation; differential input capability; instrumentation applications; low-pass filtering; monolithic IC; programmable amplification; smart sensor systems; switched-capacitor techniques; Capacitive sensors; Circuit noise; Clocks; Differential amplifiers; Filtering; Instruments; Intelligent sensors; Low pass filters; Sampled data circuits; Wideband;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.92029

Filename

92029