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

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

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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.

References

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      • Ramírez-Angulo, J., Carvajal, R.G., Torralba, A., Nieva, C.: `A new class AB differential input stage for implementation of low-voltage high slew-rate op-amps and linear transconductors', Proc. of IEEE Int. Symp. on Circuits and Systems, ISCAS'01A, Sydney, Australia, I, p. 671–674.
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      • Ramírez-Angulo, J., Carvajal, R.G., Torralba, A., Nieva, C.: `The flipped voltage follower. A useful cell for low-voltage, low-power circuit design', Proc. of IEEE Int. Symp. on Circuits and Systems, ISCAS'02, Scottsdale, AZ, USA, III, p. 615–618.
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