Subscriber unit particularly useful for time-division-multiplex

Details Subscriber unit particularly useful for time-division-multiplex Subscriber unit particularly useful for time-division-multiplex

1974-11-18

1976-05-04

Cooper, William C.

H04Q 128

Patent

active

039550524

ABSTRACT:
A line circuit for connecting telephone subscriber terminals to a signal transmission network which includes constant current sources for driving the subscriber terminals and an isolated line transformer for connecting the terminals to the transmission network. The constant current sources include a pair of transistors with a mutual feedback loop for regulating the current in the transistors. An amplifier can be included in the feedback loop to further regulate the transistor current.

REFERENCES:
patent: 3522384 (1970-07-01), Ricketts et al.

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