AN ENHANCED CURRENT-CONVEYOR BASED INSTRUMENTATION AMPLIFIER WITH HIGH CMRR

Öz

In this work, a current-mode instrumentation amplifier with common-mode current cancellation is realized using enhanced CCII topology. Detailed CMRR analysis is performed and parameters for maximizing the CMRR are defined. The proposed structure is simulated using SPICE and realized on a prototyping board. According to the simulation and measurement results the proposed circuit shows superior CMRR performance compared to other well-known current-mode instrument amplifier topologies.

Anahtar Kelimeler

• current-mode instrumentation amplifier,CMRR,current conveyors

Kaynakça

1. [1] S. Franco, Design with Operational Amplifiers and Analog Integrated Circuit, McGraw-Hill, 4th Ed., 2014.
2. [2] K. Koli, K.A.I. Halonen, “CMRR enhancement techniques for current-mode instrumentation amplifiers”, IEEE Trans. Circuits & Systems-I, vol. 47, pp.622-632, May. 2000.
3. [3] B. Wilson, “Universal conveyor instrumentation amplifier”, Electron. Lett., vol. 25, pp. 470-471, 1989.
4. [4] S. J.G. Gift, B. Maundy, F. Muddeen, “High-performance current-mode instrumentation amplifier circuit”, Int. J. Electronics, pp. 1015-1024, Nov. 2007.
5. [5] W. Su, F. Lidgey, “Common-mode rejection in current-mode instrumentation amplifiers”, Int. J. Analog Integrated Circuit Design Signal Processing, vol. 7, pp. 257-260, May 1995.
6. [6] S. J.G. Gift, “An enhanced current-mode instrumentation amplifier”, IEEE Trans. Instrum. Meas., vol. 50, pp. 85-88, Feb. 2001.
7. [7] S.J. Azhari, H. Fazlalipoor, “A novel current mode instrumentation amplifier (CMIA) topology”, IEEE Trans. Instrum. Meas., vol. 49, pp1272-1277, Dec. 2000.
8. [8] S. Maheshwari, “High CMRR wide bandwidth instrumentation amplifier using current controlled conveyors”, Int. J. Electronics, pp. 889-896, 2002.

9. [9] Y.H. Ghallab, W. Badawy, K.V.I.S. Kaler, B. Maundy, “A novel current-mode instrumentation amplifier based on operational floating current conveyor”, IEEE Trans. Instrum. Meas., vol. 54, pp. 1941-1949, Oct. 2005.
10. [10] A.A. Khan, M.A. Al-Turaigi, M.A. El-Ela, “An improved current-mode instrumentation amplifier with bandwidth independent of gain”, IEEE Trans. Instrum. Meas., vol. 44, pp. 887-891, Feb. 2001.
11. [11] U. Cini, “A low-offset high CMRR current-mode instrumentation amplifier using differential difference current conveyor”, IEEE Int. Symp. on Electronics Circuits and Systems (ICECS-14), Dec. 2014.