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Current mode instrumentation amplifier with rail-to-rail input and output

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Abstract

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.

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Acknowledgments

The authors would like to thank CNPq (National Counsel of Technological and Scientific Development) and PNM (National Program of Microelectronics) for their partially support.

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Authors and Affiliations

  1. Universidade Federal de Santa Maria – UFSM, Avenida Roraima, n. 1000, Bairro Camobi, Santa Maria, RS, Brazil

    Filipe Costa Beber Vieira, Cesar Augusto Prior, Cesar Ramos Rodrigues, Leonardo Perin & João Baptista dos Santos Martins

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  1. Filipe Costa Beber Vieira
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  2. Cesar Augusto Prior
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  3. Cesar Ramos Rodrigues
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  4. Leonardo Perin
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  5. João Baptista dos Santos Martins
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Correspondence to Filipe Costa Beber Vieira.

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Vieira, F.C.B., Prior, C.A., Rodrigues, C.R. et al. Current mode instrumentation amplifier with rail-to-rail input and output. Analog Integr Circ Sig Process 57, 29–37 (2008). https://doi.org/10.1007/s10470-008-9188-3

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  • DOI: https://doi.org/10.1007/s10470-008-9188-3

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