Improved output buffer having reduced noise characteristics

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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Details

307451, 307579, 307270, 307263, H03K 1716, H03K 19003, H03K 512

Patent

active

049280236

ABSTRACT:
A CMOS push-pull output buffer is disclosed, which utilizes two reference nodes in the pull-down side. A first of the reference nodes is dedicated to switching the output from a high to a low logic state. A switching circuit is provided for driving the pull-down transistor associated with the first reference node responsive to the input node transition, but which turns off this pull-down transistor responsive to the output node approaching its final voltage. The second reference node is dedicated for holding the output node low in the DC state. A drive circuit is provided for driving the pull-down transistor associated with this second reference node, but which does not turn on this pull-down transistor until the output node has approached its final voltage, preferably when the first pull-down transistor is turned off. By controlling the turning on of the second pull-down transistor responsive to the output voltage, the coupling of noise from the first reference node to the second reference node can be minimized.

REFERENCES:
patent: 4395644 (1983-07-01), Misaizu
patent: 4731553 (1988-03-01), Van Lehn et al.

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