Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Output switching noise reduction
Patent
1993-03-19
1995-08-01
Hudspeth, David R.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Output switching noise reduction
326 87, 326121, H03K 1716
Patent
active
054382777
ABSTRACT:
An output buffer circuit for limiting ground bounce or output signal ringing. The output buffer utilizes two pull down transistors connected to two separate grounds as well as two pull up transistors connected to two separate V.sub.DD power supplies. When the buffer output is switched from high to low, a one shot switching means is provided for switching on a first pull down transistor connected to a noisy ground for a short time delay period allowing ground bounce to occur on the noisy ground, and then switching on the second pull down transistor connected to a quiet ground while switching the first pull down transistor off. Similarly, the one shot switching means switches between the two pull up transistors to limit output signal ringing on a quiet V.sub.DD power supply. The buffer circuit further includes a lead frame with separate noisy and quiet ground leads terminating in a single pin, with the noisy and quiet ground leads overlying a floating conductive plane to reduce mutual inductance. Further, buffer input signal polarity control is provided with a limited number of gate delays.
REFERENCES:
patent: 4638187 (1987-01-01), Boler et al.
patent: 4731553 (1988-03-01), Van Lehn
patent: 4928023 (1990-05-01), Marshall
patent: 5068708 (1991-11-01), Newman
patent: 5149991 (1992-09-01), Rogers
patent: 5204554 (1993-04-01), Ohannes
patent: 5206544 (1993-04-01), Chen
patent: 5208188 (1993-05-01), Newman
patent: 5237205 (1993-08-01), Newman
Advanced Micro Devices , Inc.
Hudspeth David R.
Sanders Andrew
LandOfFree
Ground bounce isolated output buffer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ground bounce isolated output buffer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ground bounce isolated output buffer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-735667