An Enhanced Fully Differential Folded-Cascode Op Amp

Katsufumi NAKAMURA; L. Richard CARLEY

An Enhanced Fully Differential Folded-Cascode Op Amp

Katsufumi NAKAMURA, L. Richard CARLEY

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The paper presents an enhanced fully differential folded-cascode op-amp topology that achieves improved dc gain and common-mode rejection without sacrificing slew rate. The large-signal operation of the new topology is completely symmetric, providing equal positive and negative slew-rate behavior by making use of active current mirrors to bias the outputs rather than bias current sources as normally found in fully differential folded-cascode op amps. An additional advantage of the enhanced topology is that its common-mode output impedance is a factor of g_mr_o (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.

Publication: IEICE TRANSACTIONS on Electronics Vol.E75-C No.4 pp.461-466

Publication Date: 1992/04/25

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Type of Manuscript: Special Section PAPER (Joint Special Issue on the 1991 VLSI Circuits Symposium)

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Katsufumi NAKAMURA
L. Richard CARLEY

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Katsufumi NAKAMURA, L. Richard CARLEY, "An Enhanced Fully Differential Folded-Cascode Op Amp" in IEICE TRANSACTIONS on Electronics, vol. E75-C, no. 4, pp. 461-466, April 1992, doi: .
Abstract: The paper presents an enhanced fully differential folded-cascode op-amp topology that achieves improved dc gain and common-mode rejection without sacrificing slew rate. The large-signal operation of the new topology is completely symmetric, providing equal positive and negative slew-rate behavior by making use of active current mirrors to bias the outputs rather than bias current sources as normally found in fully differential folded-cascode op amps. An additional advantage of the enhanced topology is that its common-mode output impedance is a factor of g_mr_o (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.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e75-c_4_461/_p

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@ARTICLE{e75-c_4_461,
author={Katsufumi NAKAMURA, L. Richard CARLEY, },
journal={IEICE TRANSACTIONS on Electronics},
title={An Enhanced Fully Differential Folded-Cascode Op Amp},
year={1992},
volume={E75-C},
number={4},
pages={461-466},
abstract={The paper presents an enhanced fully differential folded-cascode op-amp topology that achieves improved dc gain and common-mode rejection without sacrificing slew rate. The large-signal operation of the new topology is completely symmetric, providing equal positive and negative slew-rate behavior by making use of active current mirrors to bias the outputs rather than bias current sources as normally found in fully differential folded-cascode op amps. An additional advantage of the enhanced topology is that its common-mode output impedance is a factor of g_mr_o (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.},
keywords={},
doi={},
ISSN={},
month={April},}

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TY - JOUR
TI - An Enhanced Fully Differential Folded-Cascode Op Amp
T2 - IEICE TRANSACTIONS on Electronics
SP - 461
EP - 466
AU - Katsufumi NAKAMURA
AU - L. Richard CARLEY
PY - 1992
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E75-C
IS - 4
JA - IEICE TRANSACTIONS on Electronics
Y1 - April 1992
AB - The paper presents an enhanced fully differential folded-cascode op-amp topology that achieves improved dc gain and common-mode rejection without sacrificing slew rate. The large-signal operation of the new topology is completely symmetric, providing equal positive and negative slew-rate behavior by making use of active current mirrors to bias the outputs rather than bias current sources as normally found in fully differential folded-cascode op amps. An additional advantage of the enhanced topology is that its common-mode output impedance is a factor of g_mr_o (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.
ER -