Publication:
A highly efficient composite class-AB–AB Miller op-amp with high gain and stable from 15 pF up to very large capacitive loads

Date

2018

Authors

Pourashraf, Shirin
Ramírez-Angulo, Jaime
González Carvajal, Ramón

Director

Publisher

IEEE
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión aceptada / Onetsi den bertsioa

Project identifier

AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/TEC2016-80396-C2

Abstract

In this paper, a highly power-efficient class-AB–AB Miller op-amp is discussed. The structure uses gm enhancement based on local common-mode feedback to provide class-AB operation with enhanced effective gm , open-loop gain, unity-gain frequency, and slew rate ( SR ) without significant increase in quiescent power consumption. Utilization of a nonlinear load leads to large symmetric positive and negative SRs . Stability over an extremely wide range of capacitive loads is achieved through a combination of Miller and phase-lead compensations. The unity-gain frequency does not show sensitivity to capacitive load values. A test chip prototype fabricated in 0.18- μm CMOS technology shows 90.8-dB open-loop gain, 12.5-MHz bandwidth for a 25-pF load capacitance, and a factor 60 SR enhancement with maximum output current close to 1-mA and 43- μA total static current.

Description

Keywords

CL-independent pole–zero cancelation, Class-AB op-amps, gm boosting, Nonlinear load, Phase-lead compensation

Department

Ingeniería Eléctrica, Electrónica y de Comunicación / Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren

Faculty/School

Degree

Doctorate program

item.page.cita

S. Pourashraf, J. Ramirez-Angulo, A. J. Lopez-Martin and R. González-Carvajal, "A Highly Efficient Composite Class-AB–AB Miller Op-Amp With High Gain and Stable From 15 pF Up To Very Large Capacitive Loads," in IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol. 26, no. 10, pp. 2061-2072, Oct. 2018, doi: 10.1109/TVLSI.2018.2830365.

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