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Single-Stage Amplifiers with Gain Enhancement and Improved Energy-Efficiency employing Voltage-Combiners

Póvoa , R. P. ; Lourenço, N. ; Horta, N. ; Santos Tavares, RST ; Gomes, J.

Single-Stage Amplifiers with Gain Enhancement and Improved Energy-Efficiency employing Voltage-Combiners, Proc IFIP/IEEE International Conf. on Very Large Scale Integration, Istambul, Turkey, Vol. , pp. - , October, 2013.

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Abstract
This paper presents the design of single-stage amplifiers with enhanced DC gain without the need of using any cascode devices or any positive-feedback or feed-forward techniques. Instead, two voltage-combiners are used in replacement of the traditional tail current-source that is normally employed to bias the differential-pair. Simulation results of a properly optimized circuit example, using AIDA-C a state-of-the-art multi-objective multi-constraint circuit-level optimization tool, demonstrate that DC gains above 50 dB can be achieved, together with high energy efficiency (a figure-of-merit of about 1300 MHz*pF/mA has been achieved).