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An enhanced fully differential folded-cascode op amp

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2 Author(s)
Nakamura, K. ; Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA ; Carley, L.R.

An enhanced fully differential folded-cascode operational-amplifier topology that achieves improved DC gain and common-mode rejection without sacrificing slew rate is presented. The large-signal operation of the new topology is completely symmetric, providing equal positive and negative slew-rate behavior by making use of current mirrors rather than current sources as normally found in full differential folded-cascode op-amps. An additional advantage of the enhanced topology is that its common-mode output impedance is a factor of gmro (typically 1-2 orders of magnitude) lower than the differential-mode output impedance, significantly improving the common-mode rejection ratio. The predicted performance is verified by simulations and preliminary experimental results

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:27 ,  Issue: 4 )