DAC based driver with selectable pre-emphasis signal levels

Details DAC based driver with selectable pre-emphasis signal levels DAC based driver with selectable pre-emphasis signal levels

2005-12-13

2005-12-13

Chang, Daniel D. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

C326S086000, C327S108000

Reexamination Certificate

active

06975132

ABSTRACT:
A Transmit line driver with selectable pre-emphasis and driver signal magnitudes comprises a primary current driver for setting a primary current level and a pre-emphasis current driver that provides an additional amount of current that is superimposed with or added to the primary current level produced by the primary current driver. The pre-emphasis current has either negative or positive magnitude based upon a pre-emphasis signal logic state. A first current selection module defines a reference signal that is used to select the primary current driver output signal magnitude in a first current mirror, while a second current selection module is used to define a second reference signal that selects a pre-emphasis current driver signal magnitude in a second current mirror. Logic generates a binary signal to both the first and second current selection modules to select the current levels as well as the pre-emphasis signal.

REFERENCES:
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U.S. Appl. No. 10/659,803, filed Sep. 11, 2003, Black et al.
U.S. Appl. No. 10/659,971, filed Sep. 11, 2003, Boecker et al.
U.S. Appl. No. 10/660,448, filed Sep. 11, 2003, Groen et al.

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