Output buffer with control circuitry

Details Output buffer with control circuitry Output buffer with control circuitry

1998-09-04

2000-09-19

Tokar, Michael

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 83, 326 86, H03K 1716

Patent

active

061217891

ABSTRACT:
Techniques and circuitry are used to reduce noise at the output (136) of an integrated circuit. The control circuit of the output buffer may reduce ground or power noise, or both. The control circuitry includes a ramp control circuit (153, 163) and di/dt or noise detect circuit (155, 165). A slew rate of the ramp control circuit output (173, 175) is controlled by the di/dt detect circuit. The di/dt detect circuit adjusts the slew rate of the ramp control circuit depending on the noise at the supply node which may be power (182) or ground (185), or both. The di/dt detect circuit may also be used to increase the slew rate of the ramp control circuit output to provide better performance.

REFERENCES:
patent: 4857770 (1989-08-01), Partovi et al.
patent: 5121013 (1992-06-01), Chuang et al.
patent: 5124577 (1992-06-01), Davis et al.
patent: 5153457 (1992-10-01), Martin et al.
patent: 5367210 (1994-11-01), Lipp
patent: 5438545 (1995-08-01), Sim
patent: 5528172 (1996-06-01), Sundstrom
patent: 5598119 (1997-01-01), Thayer et al.
patent: 5877647 (1999-03-01), Vajapey et al.
patent: 5914618 (1999-06-01), Mattos

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