Dual voltage, self-monitoring line circuit

H - Electricity – 04 – M

Patent

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Details

H04M 7/00 (2006.01) H04M 19/00 (2006.01)

Patent

CA 2202312

A line circuit provides BORSCHT functions and supplies the customer loop through a feed resistor network and current limiter either from a high voltage battery to provide for maximum signaling range or from a lower voltage battery to conserve power. The current limiter operates under the control of a microprocessor/DSP which selectively applies or denies power to isolate or include components for testing and controls the switching in and out of transistors to control the scaling factor between the channel width-to-length ratios of the current mirror's input and output FET transistors according to the type of test or operating condition dictated by the microprocessor while the input reference current to the current mirror is maintained constant.

Circuit de ligne offrant des fonctions de BORSCHT et alimentant la boucle d'abonné au moyen d'un réseau de résistances d'alimentation et d'un limiteur de courant à partir soit d'une pile à tension élevée permettant une plage de signalisation maximale, soit d'une batterie à tension plus faible, économe en énergie. Le limiteur de courant est commandé par un microprocesseur/DSP qui permet ou non l'alimentation, sélectivement, afin d'isoler ou d'inclure les composants à vérifier et commande l'activation et la désactivation de transistors afin de déterminer le facteur de comptage entre les rapports largeur/longueur de canal des transistors FET d'entrée/sortie du miroir de courant suivant le type d'essai ou de condition de fonctionnement dicté par le microprocesseur tandis que le courant de référence d'entrée est maintenu constant par rapport au miroir de courant.

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