Class AB amplifier with enhanced slew rate and GBW

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....

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Bibliographic Details
Published inInternational journal of circuit theory and applications Vol. 47; no. 8; pp. 1199 - 1210
Main Authors Garde, M. Pilar, Lopez‐Martin, Antonio, Algueta, Jose M., Carvajal, Ramon G., Ramirez‐Angulo, Jaime
Format Journal Article
LanguageEnglish
Published Bognor Regis Wiley Subscription Services, Inc 01.08.2019
Subjects
Amplifier design
analog integrated circuits
Circuits
class AB circuits
CMOS
CMOS integrated circuits
current amplifiers
current followers
Operational amplifiers
Slew rate
Transconductance
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Summary: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. 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.
ISSN:0098-9886
1097-007X
DOI:10.1002/cta.2650