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An active feedback coefficient tuning technique for compensating time-constant variations in continuous-time delta-sigma modulators

  • We propose a novel technique to compensate the effects of R-C / gm-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 tunable circuit structures, such as current-steering digital-to-analog converters (DAC). This approach constitutes an alternative or supplement to existing compensation techniques, including capacitor or gm tuning. We apply the proposed technique to a third-order, single-bit, low-pass continuous-time delta-sigma modulator in cascaded integrator feedback structure. A feedback path tuning scheme is derived analytically and confirmed numerically using behavioral simulations. The modulator circuit was implemented in a 0.35-μm CMOS process using an active feedback coefficient tuning structure based on current-steering DACs. Post-layout simulations show that with this tuning structure, constant performance and stable operation can be obtained over a wide range of TC variation.

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Author of HS ReutlingenWolfer, Tobias; Hennig, Eckhard
Erschienen in:2021 IEEE Asia Pacific Conference on Circuit and Systems (APCCAS), 22.-26. November 2021, Pulau Pinang, Malaysia
Place of publication:Piscatway, NJ
Document Type:Conference Proceeding
Year of Publication:2022
Tag:RLC circuits; delta-sigma modulation; digital-analog conversion; error compensation; modulation; numerical models; semiconductor device modeling
Page Number:4
DDC classes:600 Technik
Open Access?:Nein
Licence (German):License Logo  Lizenzbedingungen IEEE