Method to improve current and slew rate ratio of off-chip...

Details Method to improve current and slew rate ratio of off-chip... Method to improve current and slew rate ratio of off-chip...

2007-09-04

2007-09-04

Le, Don (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S027000, C326S087000

Reexamination Certificate

active

11012777

ABSTRACT:
An off-chip driver (OCD) circuit and technique to reduce skew between rising and falling edges of output signals as process conditions vary are provided. Variations in process conditions may result in stronger or weaker relative current drive between NMOS and PMOS transistors. One or more process-dependent compensating current paths may be added to conventional pull-up and/or pull-down current paths to compensate for process variations by supplementing the current drive of transistors used to charge (PMOS) or discharge (NMOS) an output node of and end driver (e.g., inverter) stage of an OCD.

REFERENCES:
patent: 5811991 (1998-09-01), Takashima
patent: 6163169 (2000-12-01), Lawson

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