An adaptive biasing circuit suitable for very low-voltage design of class-AB symmetrical transconductance operational amplifiers (OTAs) is presented. A non-linear current mirror is exploited to enhance the maximum tail current as a function of the input voltage, achieving a super class-AB behavior. Robustness to process and voltage supply variations and advantages of the proposed solution are demonstrated by designing a 0.6 V class-AB OTA with adaptive biasing in 0.13-μm CMOS technology, and evaluating its performance in unity-gain buffer configuration. The use of the proposed adaptive bias circuit provides a 20x slew-rate improvement with respect to the same OTA biased at constant current.
Nonlinear Adaptive Biasing for Low-Voltage Class-AB OTAs
Barile G.;Colaiuda D.;Ferri G.;Pantoli L.;Stornelli V.;
2024-01-01
Abstract
An adaptive biasing circuit suitable for very low-voltage design of class-AB symmetrical transconductance operational amplifiers (OTAs) is presented. A non-linear current mirror is exploited to enhance the maximum tail current as a function of the input voltage, achieving a super class-AB behavior. Robustness to process and voltage supply variations and advantages of the proposed solution are demonstrated by designing a 0.6 V class-AB OTA with adaptive biasing in 0.13-μm CMOS technology, and evaluating its performance in unity-gain buffer configuration. The use of the proposed adaptive bias circuit provides a 20x slew-rate improvement with respect to the same OTA biased at constant current.Pubblicazioni consigliate
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