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Super Class-AB OTAs With Adaptive Biasing and Dynamic Output Current Scaling

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5 Author(s)
Galan, J.A. ; Dept. of Electron. Eng., Univ. of Huelva ; Lopez-Martin, A.J. ; Carvajal, R.G. ; Ramirez-Angulo, J.
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A new family of single-stage super Class-AB operational transconductance amplifiers (OTAs) suitable for low-voltage operation and low power consumption is presented. Three novel topologies are proposed featuring simplicity and compactness. They are based on the combination of adaptive biasing techniques for the differential input stage and nonlinear current mirrors for the active load that provide additional dynamic current boosting. The OTAs have been fabricated in a standard 0.5-mum CMOS process. Experimental results show a greatly improved slew rate by factors 30-60 and gain-bandwidth product by factors 11.5-17 when compared to a classical Class-A OTA. The circuits are operated at plusmn1-V supply voltage with only 10 muA of bias current

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:54 ,  Issue: 3 )