Analysis, simulation and circuit implementation of a precise high-output impedance analog current mirror

  • Authors:

  • N. Charalampidis;K. Tsiakmakis;M. Spasos;K. Hayatleh;N. Mallios

  • Affiliations:

  • Department of Electronics, Alexander Technological Educational Institute, Thessaloniki, Greece;Department of Electronics, Alexander Technological Educational Institute, Thessaloniki, Greece;Department of Electronics, Alexander Technological Educational Institute, Thessaloniki, Greece;School of Technology, Oxford Brookes University, Oxford, United Kingdom;Department of Electronics, Alexander Technological Educational Institute, Thessaloniki, Greece

  • Venue:
  • ICC'10 Proceedings of the 14th WSEAS international conference on Circuits
  • Year:
  • 2010

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Abstract

The decision for the most appropriate current mirror topology when designing a circuit is a matter of trade-offs between impedance, current transfer ratio, area on chip, power consumption and voltage-headroom, expandability etc. Current mirrors are mainly used for biasing, for transferring current from one part of the circuit to another or as load for amplifier stages. This paper presents the theoretical analysis, the simulation and the circuit built of a current mirror with excellent performance characteristics compared to conventional designs at the expense of voltage-headroom. Great emphasis in the analysis of the circuit has been paid on the current transfer ratio and the output impedance of the configuration.