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Verification of an active time constant tuning technique for continuous-time delta-sigma modulators

  • In this work we present a technique to compensate the effects of R-C / g m -C time-constant (TC) errors due to process variation in continuous-time delta-sigma modulators. Local TC error compensation factors are shifted around in the modulator loop to positions where they can be implemented efficiently with finely tunable circuit structures, such as current-steering digital-to-analog converters (DAC). We apply our technique to a third-order, single-bit, low-pass continuous-time delta-sigma modulator in cascaded integrator feedback structure, implemented in a 0.35-μm CMOS process. A tuning scheme for the reference currents of the feedback DACs is derived as a function of the individual TC errors and verified by circuit simulations. We confirm the tuning technique experimentally on the fabricated circuit over a TC parameter variation range of ±20%. Stable modulator operation is achieved for all parameter sets. The measured performances satisfy the expectations from our theoretical calculations and circuit-level simulations.

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Metadaten
Author of HS ReutlingenHennig, Eckhard; Wolfer, Tobias
DOI:https://doi.org/10.1109/SMACD55068.2022.9816223
ISBN:978-1-6654-6703-2
Erschienen in:2022 18th International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD), 12-15 June 2022, Villasimius, Italy, proceedings
Publisher:IEEE
Place of publication:Piscataway, NJ
Document Type:Conference proceeding
Language:English
Publication year:2022
Tag:CMOS process; DAC; active time constant tuning technique; cascaded integrator feedback structure; continuous-time delta-sigma modulator; current-steering digital-to-analog converters; individual TC errors; local TC error compensation factors; modulator loop; process variation; reference currents; time-constant errors
Page Number:4
DDC classes:600 Technik
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt