Non-Linearity Cancellation of Gm-C Based DSM

Continuous-time (CT) Delta-Sigma-Modulators (DSMs) are widely utilized in systems requiring wide bandwidth and high resolution. While opamp-based RC integrators are favoured for their excellent linearity, they introduce low-input impedance and complicate the ADC driver. On the other side, Gm-C integ...

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Bibliographic Details
Published inIEEE International Symposium on Circuits and Systems proceedings pp. 1 - 5
Main Authors Zaky, Bishoy M., Kauffman, John G., Conzatti, Francesco, Ortmanns, Maurits
Format Conference Proceeding
LanguageEnglish
Published IEEE 25.05.2025
Subjects
Bandwidth
Circuits and systems
Delta-sigma
Gm-C integrator
Impedance
Limiting
Linearity
linearization
Simulation
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ISSN2158-1525
DOI10.1109/ISCAS56072.2025.11044033

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Summary:Continuous-time (CT) Delta-Sigma-Modulators (DSMs) are widely utilized in systems requiring wide bandwidth and high resolution. While opamp-based RC integrators are favoured for their excellent linearity, they introduce low-input impedance and complicate the ADC driver. On the other side, Gm-C integrators provide high input impedance, making them more power-efficient, but they suffer from non-linearity, thereby limiting the input range. This paper explores the limitations of a specific non-linearity cancellation technique applied in DSM system-level. The principles of this technique are reviewed, and the challenges of using it at low oversampling ratio (OSR) are investigated. A theoretical analysis is presented, matching with simulation results.
ISSN:2158-1525
DOI:10.1109/ISCAS56072.2025.11044033