Line driver with active termination

Details Line driver with active termination Line driver with active termination

2011-08-30

2011-08-30

Briney, III, Walter F (Department: 2614)

Telephonic communications

Subscriber line or transmission line interface

C379S394000

Reexamination Certificate

active

08009824

ABSTRACT:
A line driver comprises a driving amplifier receiving an input of the line driver, a current sense resistor connected between the driving amplifier output and the line driver output, and a feedback amplifier sensing the voltage across the current sense resistor and providing a corresponding feedback voltage that is proportional to the output current to the driving amplifier, thereby determining an output impedance at the line driver output. Precise output impedance can be realized by using a high precision resistor as the current sense resistor, and using resistive feedback amplifiers with accurate gains as the driving and feedback amplifiers. The resistance of the current sense resistor can be substantially less than the line driver output impedance, and the driving amplifier output voltage swing can be substantially less than twice the line driver output voltage swing.

REFERENCES:
patent: 4560834 (1985-12-01), Huft
patent: 6178241 (2001-01-01), Zhou
patent: 6788745 (2004-09-01), Lim et al.
patent: 7202746 (2007-04-01), Kejariwal et al.
Adel S. Sedra and Kenneth C. Smith, Microelectronic Circuits (4th ed. Oxford, 1997), pp. 276-282.
William H. Hayt, Jr. and Jack E Kemmerly, Engineering Circuit Analysis (5th ed. McGraw-Hill, 1993), pp. 28-33.

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