Current sensing circuit and telephone line interface card...

Details Current sensing circuit and telephone line interface card... Current sensing circuit and telephone line interface card...

G - Physics

01

R

G01R 19/00 (2006.01) G01R 19/15 (2006.01) G01R 35/00 (2006.01) H04M 3/22 (2006.01)

Patent

CA 2322934

An enhanced current sensing circuits, particularly suitable for use in telephony line interface cards is disclosed. The current sensing circuit includes a voltage sense circuit and sense amplifier that may be tuned for feed resistors of a given value to sense current through these feed resistors. Nominal values for the feed resistors are not required. A preferred voltage sense circuit includes a voltage dividing circuit connected across an impedance through which current is to be sensed. The voltage dividing circuit includes a tap to provide a voltage proportional to a voltage across the impedance, divided by a factor equal to a known multiple of the impedance. This sensed voltage may be determined without knowledge of the nominal value of the impedance and will be equal to a known fraction of the current through the impedance. A similar second voltage dividing circuit may be used to sense voltage and hence current through a second impedance. The sensed voltages may be combined to form a signal indicative of the current attributable to a differential voltage across the two impedances. Conveniently, the current sensing circuit facilitates manufacture of telephony line interface cards in which resistors used to drive a subscriber loop may not need to be trimmed to a nominal value.

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