Communication Dans Un Congrès Année : 2024

A gm/Id based methodology to estimate OTA requirements in low-pass discrete time Σ∆-ADCs

Résumé

This paper presents an analytical analysis to estimate the optimal slew rate (SR) and gain bandwidth (GBW) requirements of operational transconductance amplifiers (OTA) in discrete-time sigma-delta modulators (DT-Σ∆M). The proposed g m /I d approach takes into account the bias condition of the transistor allowing the designer to easily obtain transistor-level design specifications from system-level requirements. The accuracy of the presented study is verified by post-layout simulations of a DT-Σ∆M. The post-layout simulation results are in agreement with system-level predictions even considering process, voltage, and temperature variations.

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Dates et versions

hal-04403410 , version 1 (14-01-2025)

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Ali Mostafa, João R. Raposo de O. Martins, Jérôme Juillard, Pietro M. Ferreira. A gm/Id based methodology to estimate OTA requirements in low-pass discrete time Σ∆-ADCs. 2024 IEEE International Symposium on Circuits and Systems (ISCAS), May 2024, Singapore, Singapore. pp.1-5, ⟨10.1109/ISCAS58744.2024.10557892⟩. ⟨hal-04403410⟩
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