Battery feed circuit for telephone subscriber line

Details Battery feed circuit for telephone subscriber line Battery feed circuit for telephone subscriber line

H - Electricity

04

M

379/63

H04M 19/00 (2006.01)

Patent

CA 1208385

ABSTRACT A battery feed circuit for a two wire telephone subscriber line is miniaturized by electronic integrated circuit (IC) without transformer. The electronic battery feed circuit is composed of first and second operational amplifiers, output resistors, a DC voltage feedback loop, an AC signal feedback loop, and a switching power supply. The switching power supply is to control power source voltage of the first operational amplifier, corresponding to the length of the subscriber line loop and the status of a telephone set in the loop. Low power consumption of the circuit is attained as follows. Firstly, the losses in the output resistors are reduced by using small resistances and the loss in the second amplifier is reduced by using a small DC bias. The loss in the first amplifier is reduced by lowering its power source voltage to a level lower than its output voltage by the switching power supply. The switching power supply is composed of a zener diode, two comparators and a switching transistor circuit.

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