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
Analog IC Modules Design Using Trapezoidal Association of MOS Transistors in 0.35µm Technology
SBCCI '03 Proceedings of the 16th symposium on Integrated circuits and systems design
Design of Analog CMOS Integrated Circuits
Design of Analog CMOS Integrated Circuits
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The objective of this paper is to discuss the advantages and drawbacks of using Trapezoidal Association of Transistors (TAT) in the implementation of a low-power high-CMRR CMOS instrumentation amplifier (IA) aimed for biomedical applications. IAs are well suited for biomedical applications due to its high CMRR. For the sake of comparison, two versions of the circuit were designed, prototyped and characterized. The performance of a version with its current mirrors implemented with TAT, where supposedly higher CMRR could be achievable, is compared to another with single-transistor implementation of current mirrors in order to analyze the CMRR performance. The IA circuit was designed in AMIS 1.5 μm technology and manufactured through the MOSIS Service. In addition to the better performance attained by the classic implementation of the amplifier, with CMRR higher than 120 dB, this version of the IA consumed less than one third of the area from the TAT version. Comparison of both versions from same topology indicates no advantages of using TATs in the current mirrors of this type of IA.