Input/output buffer incorporating filter for powerline...

Details Input/output buffer incorporating filter for powerline... Input/output buffer incorporating filter for powerline...

2001-12-28

2003-10-21

Tokar, Michael (Department: 2819)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S051000, C330S120000, C330S265000, C330S267000, C330S268000

Reexamination Certificate

active

06636117

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to amplifiers and buffers, particularly for driving a signal onto a power line.
PRIOR ART
The present invention is an improvement of an amplifier disclosed in U.S. Pat. No. 5,241,283 which is discussed in conjunction with
FIGS. 1 and 2
of this application.
SUMMARY OF THE INVENTION
An improvement in a input/output buffer for transmitting a communication signal over a power line is described. The buffer includes a transmit filter which receives an input from a digital-to-analog converter. The output stage of the buffer has a first pair of emitter followers for driving an output in a first direction and a second pair of emitter followers for driving the output in the opposite direction. The improvement of the present invention comprises maintaining the collector-to-emitter voltage constant without degrading the ability to provide an output signal nearly equal to the supply potential. This substantially reduces the distortion associated the prior art amplifier.


REFERENCES:
patent: 4540951 (1985-09-01), Ozawa et al.
patent: 4570128 (1986-02-01), Monticelli
patent: 4791383 (1988-12-01), Monticelli et al.
patent: 5241283 (1993-08-01), Sutterlin
patent: 5510754 (1996-04-01), Moraveji et al.
patent: 5512859 (1996-04-01), Moraveji
patent: 5786731 (1998-07-01), Bales
patent: 6166603 (2000-12-01), Smith
patent: 6236273 (2001-05-01), Lewyn
Sutterlin Philip H., “Drive amplifier for power line communications” Nov. 26, 1992, PCT, International publication No. WO 92/21177.

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