Precharge and discharge of I/O output driver

Details Precharge and discharge of I/O output driver Precharge and discharge of I/O output driver

2006-04-24

2010-11-16

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S112000, C326S026000, C326S087000

Reexamination Certificate

active

07834667

ABSTRACT:
A buffer circuit is disclosed. In one embodiment, the buffer circuit includes a preconditioning circuit and a driver circuit. The preconditioning circuit generates a pre-charge signal in response to receiving an input signal. After a predetermined duration, or when the pre-charge circuit reaches a threshold output signal level, the input signal is coupled to an input of the driver circuit. The output signal of the driver circuit is combined with the output signal of the preconditioning circuit to form a composite output signal of the buffer circuit. In one embodiment, the pre-charge signal is used to lower the effective VDS across the transistors of the driver circuit to reduce hot-carrier injection, and therefore reduce transistor performance degradation.

REFERENCES:
patent: 4829199 (1989-05-01), Prater
patent: 5319258 (1994-06-01), Ruetz
patent: 6377089 (2002-04-01), Loughmiller
patent: 7215144 (2007-05-01), Mitby et al.
patent: 2006/0061395 (2006-03-01), Noto et al.
patent: 2006/0071697 (2006-04-01), Mels

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