Artículo
A Highly Efficient Composite Class-AB-AB Miller Op-Amp With High Gain and Stable From 15 pF Up To Very Large Capacitive Loads
Autor/es | Pourashraf, Shirin
Ramírez Angulo, Jaime López Martín, Antonio J. González Carvajal, Ramón |
Departamento | Universidad de Sevilla. Departamento de Ingeniería Electrónica |
Fecha de publicación | 2018 |
Fecha de depósito | 2023-01-20 |
Publicado en |
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Resumen | 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 ... 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. |
Cita | Pourashraf, S., Ramírez Angulo, J., López Martín, A.J. y González Carvajal, R. (2018). A Highly Efficient Composite Class-AB-AB Miller Op-Amp With High Gain and Stable From 15 pF Up To Very Large Capacitive Loads. IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 26 (10), 2061-2072. https://doi.org/10.1109/TVLSI.2018.2830365. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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Shirin_HighlyEfficient.pdf | 4.350Mb | [PDF] | Ver/ | |