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Low-power low-voltage differential class-AB OTAs for SC circuits

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4 Author(s)
Carvajal, R.G. ; Departamento de Ingenieria Electronica Escuela Superior de Ingenieros, Seville Univ., Spain ; Galan, J. ; Ramirez-Angulo, J. ; Torralba, A.

Two new differential class-AB operational transconductance amplifiers (OTAs) for SC circuits that operate with a supply voltage of less than two transistor threshold voltages are introduced. They make use of a new class-AB pseudodifferential pair to generate signal currents much larger than quiescent currents. Both OTAs have been designed to operate with a supply voltage of VDD=1.1 V, using a 0.35 μm CMOS technology. Simulation results for a load capacitance (CL) of 1 pF show 15 MHz gain-bandwidth product with a quiescent power consumption of 10 μW.

Published in:

Electronics Letters  (Volume:38 ,  Issue: 22 )