High speed driver for serial communications

Details High speed driver for serial communications High speed driver for serial communications

2007-06-19

2007-06-19

Chang, Daniel D. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Pulse shaping

C326S026000, C326S086000, C326S087000, C327S065000, C327S108000, C365S189050

Reexamination Certificate

active

11095882

ABSTRACT:
A differential output driver capable for selectively switching from an emphasis mode, a non-emphasis mode, and an idle state uses one pull-up device and two pull-down devices per output lead. The pull-up device is preferably always activated, and one or the other or both or neither of the pull-down devices are selectively activated to provide a desired behavior. Neither pull-down device is strong enough to singularly overcome the pull-up device and fully pull down an output lead to an emphasis logic low level. One of the pull-down devices is singularly strong enough to bring an output lead to a non-emphasis logic low level, which is higher than an emphasis logic low level. The other pull-down device is singularly strong enough to pull an output line from an emphasis logic high level to a non-emphasis logic high level. Working together, however, both devices can pull-down an output lead to an emphasis logic low level. Thus, when a non-emphasis logic high output is desired, the weak pull-down device is actuated. To output a non-emphasis logic low level, the strong pull-down device is activated. To output an emphasis logic low level, both pull-down devices are activated, and to output an emphasis logic high level, both pull-down devices are deactivated. To provide an idle output voltage level, both pull-down devices are further weakened and both are activated at the same time.

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