Precision, low-power current-sense transmission channel for...

Details Precision, low-power current-sense transmission channel for... Precision, low-power current-sense transmission channel for...

2005-03-29

2005-03-29

Nguyen, Duc (Department: 2643)

Telephonic communications

Subscriber line or transmission line interface

C330S100000, C330S150000, C330S151000, C330S255000, C330S259000, C327S089000, C327S560000, C327S561000, C327S562000, C327S563000

Reexamination Certificate

active

06873703

ABSTRACT:
A transmission channel for a subscriber line interface circuit comprises a front end, tip/ring current-sensing transimpedance stage, containing relatively low valued tip and ring sense resistors coupled in circuit with tip and ring paths of a telecommunication wireline pair. The front end transimpedance stage transforms differential tip and ring input currents sensed by the tip and ring sense resistors into a single ended voltage, which is coupled to a transconductance amplifier filter/gain stage. The filter/gain stage is configured to provide a programmable output impedance, and converts the voltage from the current-sensing transimpedance stage into an output transmission voltage for application to a selected one of a current-sense, voltage-feed, or voltage-sense, voltage-feed telecommunication circuit.

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