Hybrid voltage/current-mode transmission line driver

Details Hybrid voltage/current-mode transmission line driver Hybrid voltage/current-mode transmission line driver

2005-07-01

2009-12-29

Phu, Phuong (Department: 2611)

Pulse or digital communications

Cable systems and components

C375S222000, C375S220000, C375S219000, C375S258000

Reexamination Certificate

active

07639746

ABSTRACT:
A system that transmits signals through a communication channel. During operation, the system receives a sequence of bits for transmission through the communication channel. While transmitting a given bit, the system determines if the given bit has the same state as the previously transmitted bit. If so, the system uses a voltage-mode driver to drive a signal through the communication channel. Otherwise, the system uses a current source coupled to the voltage-mode driver to boost the drive-level of the voltage-mode driver. Note that the current source supplies a current to the communication channel without changing the impedance of the voltage-mode driver. In this way, the present invention compensates for frequency dependant losses in the communication channel without sacrificing impedance matching and without substantially increasing power consumption.

REFERENCES:
patent: 5771262 (1998-06-01), Benayoun et al.
patent: 6281715 (2001-08-01), DeClue et al.

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