Common-mode rejection ratio in current-mode instrumentation amplifiers
Analog Integrated Circuits and Signal Processing - Special issue: current processing and current mode circuits, part II
A new architecture for rail-to-rail input constant-gm CMOS operational transconductance amplifiers
Proceedings of the 2003 international symposium on Low power electronics and design
Low-Power CMOS Interface for Recording and Processing Very Low Amplitude Signals
Analog Integrated Circuits and Signal Processing
Design of an integrated low power high CMRR instrumentation amplifier for biomedical applications
Proceedings of the 20th annual conference on Integrated circuits and systems design
A novel ±0.5 V, high current drive, and rail to rail current operational amplifier
Analog Integrated Circuits and Signal Processing
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This paper presents the results from an investigation on the implementation of Current Mode Instrumentation Amplifiers (CMIAs) with rail-to-rail operational amplifiers (op amp) with a gm control circuit. The objective of employing rail-to-rail op amps in the implementation of a CMIA is the improvement of the common-mode operation range. The enhancement of the input common mode range (ICMR) is obtained using op amps with a rail-to-rail input stage followed by a cascode-based output stage. A prototype of the CMIA was implemented in standard 0.6 μm XFAB CMOS technology. Test results showed that the CMIA common mode range was extended but with moderated CMRR. To minimize this issue the amplifier was re-designed and sent to fabrication. Simulations with the components variations included were performed and showed the enhancement of the CMRR can be expected.