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Novel loop architectures for enhancing linearity and resolution of analog-to-digital converters

Abstract : This paper proposes three mixed (analog and digital) loop architectures which involve an analog-to-digital converter and enhance its linearity and its resolution. Their benefits are discussed with mathematical models and high-level simulations (the ADC inserted in the loops is then a passive sigma-delta structure). One of the loop topologies is particularly highlighted: it is ideally able to enhance resolution by 5 bits without damaging bandwidth. The only added analog element is an active differential low-pass filter. The other operators are fully digital: a predictor and some models of the analog parts. The effect of some defaults, such as mismatch and common mode, is illustrated by high-level simulations. The needed accuracy for the digital parameters is evaluated to 16 bits. The test of a prototype realized in a 0.358m CMOS technology validates the principle and demonstrates that the critical element of the structure is the active differential filter.
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Submitted on : Thursday, December 2, 2010 - 11:12:19 AM
Last modification on : Monday, December 14, 2020 - 12:38:04 PM
Long-term archiving on: : Thursday, March 3, 2011 - 2:46:31 AM


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Sylvie Guessab, Philippe Benabes. Novel loop architectures for enhancing linearity and resolution of analog-to-digital converters. Analog Integrated Circuits and Signal Processing, Springer Verlag, 2010, 65 (3), pp.359-377. ⟨10.1007/s10470-009-9400-0⟩. ⟨hal-00542287⟩



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