Adaptive high performance ΣΔ modulator designs

Gökdel Y. D., Talay S., DÜNDAR G.

2007 Ph.D Research in Microelectronics and Electronics conference, PRIME 2007, Bordeaux, Fransa, 2 - 05 Temmuz 2007, ss.281-284, (Tam Metin Bildiri) identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1109/rme.2007.4401867
  • Basıldığı Şehir: Bordeaux
  • Basıldığı Ülke: Fransa
  • Sayfa Sayıları: ss.281-284
  • Boğaziçi Üniversitesi Adresli: Evet

Özet

In this paper, different solutions to the saturation problem of the integrator building block of Sigma-Delta (SD) modulators are proposed. Saturation causes an error that limits the dynamic input range of SD A/D converters and consequently decreases its SNR. The proposed structure, using a variable gain integrator followed by a non-uniform quantizer as companding, makes the usage of higher input levels to the A/D converter possible. Also with speech signals in which very high and very low signals reside, this architecture performs much better. © 2007 IEEE.