Scaling input signal swings of overloaded integrators in resonator-based sigma-delta modulators

Yazkurt U., DÜNDAR G., Talay S., Beilleau N., Aboushady H., De Lamarre L.

ICECS 2006 - 13th IEEE International Conference on Electronics, Circuits and Systems, Nice, Fransa, 10 - 13 Aralık 2006, ss.966-969, (Tam Metin Bildiri) identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1109/icecs.2006.379951
  • Basıldığı Şehir: Nice
  • Basıldığı Ülke: Fransa
  • Sayfa Sayıları: ss.966-969
  • Boğaziçi Üniversitesi Adresli: Evet

Özet

Overloading of the integrators in loop filter of Sigma-Delta modulators is a performance degrading factor in circuit implementations. In this paper, it is shown that in resonator-based Σ-Δ modulators scaling factors should be introduced in order to adjust the integrators' input. A systematic method is presented to calculate these scaling factors without modifying the noise and signal transfer functions. The effect of the scaling factors on circuit implementation is also discussed. Several examples are given to illustrate the influence of the scaling factors on the Σ-Δ performances depending on the order, architecture and number of bits of the quantizer. © 2006 IEEE.