Line transceiver apparatus for multiple transmission standards

Details Line transceiver apparatus for multiple transmission standards Line transceiver apparatus for multiple transmission standards

2010-12-02

2011-11-08

Ismail, Shawki S (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

Reexamination Certificate

active

08054100

ABSTRACT:
A line transceiver apparatus for multiple transmission standards including a operational amplifier (OP-AMP), a transformer unit, a first variable resistor unit to a sixth variable resistor unit, and a variable resistor control unit is provided. The first resistor and the second resistor are coupled between transmission nodes of the line transceiver apparatus and input nodes of the OP-AMP, and the load nodes of the transformer unit are receiving nodes of the line transceiver apparatus. The variable resistor control unit adjusts the impedances of the first variable resistor unit to the sixth variable resistor unit according to a transmission standard selection signal so as to enable the line transceiver apparatus to support multiple transmission standards.

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Joseph, “A 100-MHz, 50-Ω, −45-dB Distortion, 3.3-V CMOS Line Driver for Ethernet and Fast Ethernet Networking Applications” IEEE Journal of Solid-State Circuits, vol. 34, No. 8, Aug. 1999, 7pages.

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