Low voltage differential signalling driver with pre-emphasis

Details Low voltage differential signalling driver with pre-emphasis Low voltage differential signalling driver with pre-emphasis

2005-11-04

2010-02-23

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S112000

Reexamination Certificate

active

07667502

ABSTRACT:
There is provided a LVDS driver arranged to receive an input signal which switches between two voltage levels. The driver comprises a pre-emphasis block (405) for generating a pre-emphasis signal having a first voltage level for a time period T1after each switch of the input signal, and a second voltage level at all other times, a differential pair of outputs for generating a differential output voltage across a load resistor (RI); and a driver circuit (401) comprising two parallel branches, each branch being connected to one output and each branch being arranged to receive the pre-emphasis signal. The driver is arranged so that the total current flowing through the driver circuit is constant, and during time period T1, the total current flowing through the driver circuit flows through the load resistor, thereby producing a differential output voltage and at all other times, only some of the total current flowing through the driver circuit flows through the load resistor, thereby reducing the differential output voltage.

REFERENCES:
patent: 6246870 (2001-06-01), Dent et al.
patent: 6281715 (2001-08-01), DeClue et al.
patent: 6288581 (2001-09-01), Wong
patent: 6646482 (2003-11-01), Takeuchi
patent: 7256626 (2007-08-01), Nguyen et al.
patent: 7408387 (2008-08-01), Suenaga
patent: 2003/0085736 (2003-05-01), Tinsley et al.
patent: 2004/0124888 (2004-07-01), Radelinow

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