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Single Transistor High-Impedance Tail Current Source With Extended Common-Mode Input Range and Reduced Supply Requirements

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3 Author(s)
Ramirez-Angulo, J. ; New Mexico State Univ., Las Cruces ; Carvajal, R.G. ; Lopez-Martin, A.J.

A compact implementation of a single transistor tail current source with very high output impedance (>40 MOmega) and low-voltage requirements is introduced. The tail transistor can operate with less than a drain-source saturation voltage and allows implementation of low-voltage differential pairs with wide common-mode input range and very high common-mode rejection ratio. Simulation and experimental results are shown that validate the proposed circuit.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:54 ,  Issue: 7 )