System for reducing distortion in a line powered modulator

Details System for reducing distortion in a line powered modulator System for reducing distortion in a line powered modulator

2005-01-18

2005-01-18

Tieu, Binh (Department: 2643)

Telephonic communications

Subscriber line or transmission line interface

C379S093050, C379S093360, C379S412000

Reexamination Certificate

active

06845156

ABSTRACT:
A method and apparatus for a telephone line interface or data access arrangement (DAA) which includes a shunt regulator in series with a line modulator and a sense resistor. A shunt regulator is placed in series between the sense resistor and the line modulator. The shunt regulator draws power from the telephone line, and the sense resistor senses the amount of current being drawn. The voltage across the sense resistor is fed back to the line modulator. The line modulator is thus capable of adjusting the AC modulation and the DC termination presented to the telephone line based upon the sensed current draw from the telephone line. The telephone line interface can also place an information signal on the telephone line. The method of placing the information signal on the telephone line includes sensing the current draw from the telephone line with a sense resistor, drawing current from the telephone line and through the sense resistor with the shunt regulator, and modulating the output signal from the shunt regulator based on the information signal.

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patent: 6763107 (2004-07-01), Fischer et al.

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