Tx line driver with common mode idle state and selectable...

Details Tx line driver with common mode idle state and selectable... Tx line driver with common mode idle state and selectable...

2005-03-22

2005-03-22

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

C326S115000, C326S127000, C326S021000, C326S026000, C327S108000, C327S170000

Reexamination Certificate

active

06870390

ABSTRACT:
A transmit line driver with selectable slew rates and a common mode idle state comprises a capacitor array of selectable capacitors coupled between a line driver and a pre-driver wherein a slew rate may be selected by the selectable capacitors. A common mode idle state is provided by coupling a selectable switch (MOSFET in the described embodiment) to a mirror device that provides a bias current to the pre-driver wherein, when the bias current is removed by the switch, the pre-driver produces an output signal that is equal to the supply voltage for the circuit. Accordingly, a differential pair of the line driver are both biased on and provide a common mode idle state. The common mode idle state is equal to one half of an output signal magnitude for a logic one.

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. 10/660,062, filed Sep. 11, 2003, Groen et al.

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