Current-Mode Rail-to Rail Instrumentation Amplifier for General Purpose Instrumentation Applications

Year 2016, Special Issue (2016), 363 - 367, 01.12.2016

Uğur Çini

https://doi.org/10.18100/ijamec.280497

Abstract

 Instrumentation amplifiers are used extensively in
bio-potential reading, industrial sensor applications, Wheatstone bridge
amplifiers etc. In this work, a high input common-mode range instrumentation
amplifier is presented. The amplifier is composed of two second generation
current conveyors (CCII+) with common-mode input range close to supply swings
and a differential difference current conveyor (DDCC) at the second stage with
high voltage swing at the output. Also an optional DC servo loop is employed as
a feedback to second stage for the removal of any possible DC offset voltage at
the output which can be used for AC coupled applications. The simple design
strategy with high input common-mode range and nearly rail-to-rail output stage
together with increased bandwidth advantage of current-mode approach makes the
proposed implementation desirable for many of the general purpose
instrumentation applications. The design is made using 0.35μm AMS technology
with 3V supply voltage. The operation is verified by HSPICE simulations.

Keywords

Current-mode circuits, biomedical instrumentation, current-conveyors, current-mode instrumentation amplifier (CMIA)

References

• [1] S. Franco, Design with Operational Amplifiers and Analog Integrated Circuits,2nd Ed., McGraw Hill, 1997.
• [2] K. Koli, “CMRR enhancement techniques for current-mode instrumentation amplifiers”, IEEE Trans. on Circuits and Systems I, pp. 622-632, Vol.47, No.5, May 2000.
• [3] W. J. Su, F. J. Lidgey, “Common-mode rejection ratio in current-mode instrumentation amplifiers”, Analog Integrated Circuits and Signal Processing, Vol. 7, Issue 3, pp 257-260, May 1995.
• [4] C. Toumazou, F. Lidgey, “Novel current-mode instrumentation amplifier”, Electron. Lett., Vol. 25, pp. 228-230, Feb. 1989.
• [5] S. J. G. Gift, “An Enhanced current-mode instrumentation amplifier”, IEEE Trans. on Inst. and Meas., Vol. 50, No. 1, pp. 85-88, Feb. 2001.
• [6] S. J.G. Gift, B. Maundy, F Muddeen, "High-performance current-mode instrumentation amplifier circuit", Int. Jour. of Electronics, Vol. 94, No.11, pp. 1015-1024, Nov. 2007.
• [7] A. Khan, M. A. Turaigi, M.A. Al-Ela , “An Improved Current-Mode Instrumentation Amplifier with Bandwidth Independent of Gain”, IEEE Trans. on Inst. and Meas., Vol.44, No.4, 1995.
• [8] A W. Chiu, S. I. Liu, H. W. Tsao, J. J. Chen, "CMOS differential difference current conveyors and their applications", IEE Proc. Circuits Devices Syst., Vol. 143, No. 2, April 1996.
• [9] B. Razavi, Fundamentals of Microelectronics, Wiley, 2008.
• [10] G.Ferri, N.Guerrini, Low-voltage low-power CMOS current-conveyors, Kluwer Academic Publisher, Boston, 2003.
• [11] C.Falconi, G.Ferri, V.Stornelli, A. De Marcellis, A.DAmico, D.Mazzieri, “Current Mode, High Accuracy, High Precision CMOS Amplifiers”, IEEE Transactions on Circuits and Systems II, vol.55 n.5, May 2008, pp.394-398.
• [12] D. M. Das, M. S. Baghini, D. K. Sharma, “Design Considerations for High-CMRR Low-Power Current Mode Instrumentation Amplifier for Biomedical Data Acquisition Systems”, ICECS 2014, pp. 251-254, Dec. 2014.
• [13] W. J. Su, E. J. Lidgey, “Common-mode rejection ratio in current-mode instrumentation amplifiers”, Analog Integr. Circ. Sig. Process., Vol. 7, pp: 257-260, 1995.
• [14] C. A. Prior, C. R. Rodrigues, A. L. Aita, J. B. Martins, F. C. Vieira, “Design of an integrated low power high CMRR instrumentation amplifier for biomedical applications”, Analog Integr. Circ. Sig. Process., Vol. 57, pp. 11-17, 2008.
• [15] P. Bruschi, F. D. Cesta, M. Piotto, R. Simmarano, “A very compact CMOS instrumentation amplifier with nearly rail-to-rail input common mode range”, ICECS 2014, pp. 323-326, Dec. 2014.
• [16] D. M. Das, M. S. Baghini, D. K. Sharma, “Design Considerations for High-CMRR Low-Power Current Mode Instrumentation Amplifier for Biomedical Data Acquisition Systems”, ICECS 2014, pp. 251-254, Dec. 2014.