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2. Effect of OPAMP Input Offset on Continuous-Time \Delta\Sigma Modulators With Current-Mode DACs.

Author

Wang, Rui, Huang, Deping, He, Tianshi, Chen, Jinghong, You, Yang, and Gui, Ping

Subjects
OPERATIONAL amplifiers, CONTINUOUS-time filters, ELECTRONIC modulators, DIGITAL-to-analog converters, ELECTRICAL harmonics
Abstract

This paper analyzes the effect of operational amplifier (OPAMP) input offset on continuous-time (CT) delta-sigma (\Delta\Sigma) modulators with current-mode feedback digital-to-analog converters (DAC). Our analysis shows that the input offset leads to either increased harmonics or increased noise floor of the modulator, depending on whether a DAC shuffling scheme, such as data-weighted averaging (DWA), is applied or not. Analysis and mathematical derivation are given and verified by transistor-level simulations. An input-offset cancellation scheme is proposed and demonstrated by simulation results. [ABSTRACT FROM AUTHOR]

Published
2015
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