Low switching noise output buffer

Details Low switching noise output buffer Low switching noise output buffer

1993-06-28

1995-05-30

Hudspeth, David R.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 29, 327131, 327380, H03K 19094

Patent

active

054205255

ABSTRACT:
The switching noise generated by a data output buffer is greatly reduced by "precharging" the output node to an intermediate voltage during a system's "dead" time. This is done with a precharging output current pulse having a constant time derivative during a first time interval and a constant time derivative of opposite sign during a second time interval, before performing the actual switching with an output current having a constant time derivative, during a third time interval. The partial precharging with a controlled, triangular-shaped, output current pulse, avoids any abrupt change of output current and thus limits switching noise. The buffer of the invention is particularly useful in high-speed memory devices.

REFERENCES:
patent: 4975598 (1990-12-01), Borkar
patent: 4983860 (1991-01-01), Yim et al.
patent: 5028818 (1991-07-01), Go Ang et al.
patent: 5057711 (1991-10-01), Lee et al.
patent: 5122690 (1992-06-01), Bianchi

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