Elliptic filtering in continuous-time sigma-delta modulator

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Elliptic filtering in continuous-time sigma-delta modulator

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An improved continuous-time sigma-delta (ΣΔ) architecture with elliptic signal transfer function is presented. It is demonstrated that the UTRA/FDD band 1 interferer filtering can be fully achieved within the sigma-delta loop.

Inspec keywords: optical transfer function; filtering theory; sigma-delta modulation

Other keywords: elliptic signal transfer function; elliptic filtering; UTRA-FDD band 1; continuous time sigma-delta architecture; sigma-delta loop; interferer filtering; continuous time sigma-delta modulator

Subjects: Filtering methods in signal processing; A/D and D/A convertors; Modulation and coding methods

References

    1. 1)
      • Philips, K.: `A 2 mW 89 dB DR continuous-time ΣΔ ADC with increased immunity to wide-band interferers', ISSCC Dig. Tech. Pprs., February 2004, p. 86–87.
    2. 2)
    3. 3)
      • R.H.M. van Veldhoven . A 3.3 mW sigma delta modulator for UMTS in 0.18 µm CMOS with 70 dB dynamic range in 2 MHz bandwidth. IEEE J. Solid-state Circuits , 2069 - 2076
    4. 4)
    5. 5)
      • S.R. Norsworthy , R. Schreier , G.C. Temes . (1997) Delta-sigma data converters—theory, design and simulation.
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