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Class AB amplifier with enhanced slew rate and GBW |
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| Authors: | M Pilar Garde Antonio Lopez-Martin Jose M Algueta Ramon G Carvajal Jaime Ramirez-Angulo |
| Affiliation: | 1. Department of Electrical, Electronic and Communications Engineering, Public University of Navarra, Pamplona, Spain
Institute of Smart Cities, Public University of Navarra, Pamplona, Spain;2. Department of Electrical, Electronic and Communications Engineering, Public University of Navarra, Pamplona, Spain;3. Department of Electronic Engineering, School of Engineering, University of Seville, Sevilla, Spain;4. Klipsch School of Electrical Engineering, New Mexico State University, Las Cruces, New Mexico, USA |
| Abstract: | 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. |
| Keywords: | analog integrated circuits class AB circuits CMOS integrated circuits current amplifiers current followers |