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Full CMOS continuous time filters for GSM applications

Filtres à Temps Continu Entiérement Cmos Pour Applications GSM


This paper describes full cmoscontinuous time filter design techniques which can meet the specifications commonly set for gsmapplications. First several cmosfilter design techniques are overviewed. The ota-ctechnique is discussed to some more detail. To overcome the main drawback of the lower total harmonic distortion in ota-ctechniques very linear operational transconductance amplifiers (ota)are required. Such an ota,together with the applied linearisation techniques is discussed. To fulfil high accuracy in cut- off frequencies of the filter an active tuning system is necessary. A new on- chip tuning system is presented. The paper concludes with a practical design example for the gsmsystem. Therein the different ota-ctechniques discussed are illustrated.


ľ article décrit la réalisation de filtres analogiques à temps continu plutôt qu’à données échantillonnées,en insistant sur la technologie ota-cbasée sur des condensateurs et des amplificateurs opérationnels du type transconductance. Cette technologie est comparée à celles des capacités commutées et des filtres actifs rc.Elle utilise un transducteur linéaire de tension en courant. Une linéarité élevée permet de maintenir une faible distorsion harmonique. Un accord automatique de fréquence sur la puce est nécessaire pour obtenir une grande précision des fréquences de coupure. Un exemple concret est un passe- bas de Legendre du 4 e ordre.

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Correspondence to Michel S. J. Steyaert or Stefan Gogaert or Wim Dehaene or José Silva-martinez or Jan Sevenhans.

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Steyaert, M.S.J., Gogaert, S., Dehaene, W. et al. Full CMOS continuous time filters for GSM applications. Ann. Télécommun. 48, 224–232 (1993).

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Key words

  • Electric filter
  • Analog filter
  • Complementary mos technology
  • Operational amplifier
  • Current voltage converter
  • Linearization
  • Linear circuit
  • Frequency tuning
  • Telecommunication application

Mots clés

  • Filtre électronique
  • Filtre analogique
  • Technologie mos complémentaire
  • Amplificateur opérationnel
  • Convertisseur courant tension
  • Linéarisation
  • Circuit linéaire
  • Accord fréquence
  • Application télécommunication