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Switched capacitor filters for a 1200 baud FFSK modem

Filtres a capacités commutées pour modem a modulation par déplacement de fréquence rapide (MDFR) a 1200 bauds

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Abstract

The design of two 8th order switched capacitor filters for anFFSKmodem is described. The response of the filters in the passband is not made flat, in order to optimize the signal to noise ratio of the transmission channel. The design of passive prototypes and the criteria for the choice of the best passive and active topologies are described. Computer simulation results of the performances of the SC filters are given.

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Cet article décrit la conception de deux filtres passebande d’ordre 8 à capacités commutées pour modem à modulation par déplacement de fréquence rapide destiné à la transmission de données du service mobile. La réponse des filtres dans la bande passante doit être déterminée de façon à optimiser le rapport signal/bruit de la voie de transmission. Description de la synthèse de prototypes passifs et analyse des critères de conception des topologies actives et passives optimales. Les résultats de la simulation numérique des caractéristiques des filtres à capacités commutées sont en accord avec les spécifications requises par le modemMDFRà 1 200 bauds.

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Authors and Affiliations

  1. Italtel, Castelletto di Settimo Milanese, Milano, Italy

    Claudio Canosi, Armando Colamonico & Marcello Donati

  2. Dipartimento di Elettronica, Università di Pavia, Italy

    Franco Maloberti

Authors
  1. Claudio Canosi
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  2. Armando Colamonico
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  3. Marcello Donati
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  4. Franco Maloberti
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Canosi, C., Colamonico, A., Donati, M. et al. Switched capacitor filters for a 1200 baud FFSK modem. Ann. Télécommun. 40, 235–242 (1985). https://doi.org/10.1007/BF03004499

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  • DOI: https://doi.org/10.1007/BF03004499

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