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Class AB amplifier with enhanced slew rate and GBW
Author(s) -
Garde M. Pilar,
LopezMartin Antonio,
Algueta Jose M.,
Carvajal Ramon G.,
RamirezAngulo Jaime
Publication year - 2019
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2650
Subject(s) - slew rate , micropower , operational transconductance amplifier , biasing , transconductance , current feedback operational amplifier , amplifier , operational amplifier , direct coupled amplifier , electronic engineering , electrical engineering , fully differential amplifier , cmos , voltage , power (physics) , engineering , transistor , physics , quantum mechanics
Summary The design of a micropower class AB operational transconductance amplifier with large dynamic current to quiescent current ratio is addressed. It is based on a compact and power‐efficient adaptive biasing circuit and a class AB current follower using the quasi‐floating gate (QFG) technique. The amplifier has been designed and fabricated in a 0.5‐μm CMOS process. Simulation and measurement results show a slew rate (SR) improvement factor versus the class A version larger than 4 for the same supply voltage and bias currents, as well as enhanced small‐signal performance.