Title :
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
fDate :
7/1/1991 12:00:00 AM
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-μVrms input equivalent wideband noise) and offset, low harmonic distortion, and small amplification error (<0.06% at 4 Vpp). 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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
