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This paper investigates the subthreshold operation of the inverter-based operational transconductance amplifier for the potential use in very low power data conversion systems. Circuit analysis and sizing strategies are presented, and a first order continuous-time delta-sigma modulator circuit is used as a case study to verify the performance of the amplifier when operating in subthreshold region...
In this paper we examine a digitally controllable Nauta structure implemented in a 65nm process and identify a strategy useful for calibrating the structure in such a way that a maximum gain is achieved. We propose an efficient and simple tuning procedure that could be the basis for an integrated on-chip calibration solution and investigate the feasibility of implementing it. The procedure would primarily...
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