Output buffer with oscillation damping

Details Output buffer with oscillation damping Output buffer with oscillation damping

1995-11-20

1998-03-17

Santamauro, Jon

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 33, 326 86, H03K 190948

Patent

active

057291535

ABSTRACT:
Oscillation of the output (16, 17) of an integrated circuit output buffer (43) is automatically damped by sensing ground lead (18) transients as the buffer output (16, 17) changes, and when the ground lead (18) swing is large enough, using the sensed change to apply a turn-off signal of the appropriate polarity to a transistor (N1) serially placed in the output buffer (43) to add resistance during the transition. The added resistance damps out the oscillations quickly to prevent rebound of the buffer output voltage past the logic transition threshold (Vol). An RC time constant (R1, C1) controls the duration of the added resistance which disappears after the transition is complete. The action of a damping control circuit (45) is speed dependent so that greater damping is provided for fast transitions when oscillations would be more sever and no damping during slow transitions when damping is not needed.

REFERENCES:
patent: 4862018 (1989-08-01), Taylor et al.
patent: 5008568 (1991-04-01), Leung et al.
patent: 5028817 (1991-07-01), Patil
patent: 5121000 (1992-06-01), Naghsineh
patent: 5473263 (1995-12-01), Mahmood

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