Fast swing-limited pullup circuit

Details Fast swing-limited pullup circuit Fast swing-limited pullup circuit

1995-06-28

1997-04-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327374, 327391, 327437, H03K 19094, H03K 190948

Patent

active

056191537

ABSTRACT:
A pullup circuit having a limited voltage swing and fast pullup and pulldown times comprises a pullup structure, a pulldown structure and an internal node. The pullup circuit operates to limit the current of the pullup structure before the N-tree discharges the internal node, thereby reducing the pullup effect of the pullup structure to reduce fall time and power consumption. Then the pullup circuit maximizes the current of the pullup structure after the N-tree has pulled down the internal node to increase the pullup effect of the pullup structure to reduce rise time. As a result, the voltage of the internal node both charges more quickly when the N-tree becomes inactive and discharges more quickly when the N-tree becomes active.

REFERENCES:
patent: 4542310 (1985-09-01), Ellis et al.
patent: 4806787 (1989-02-01), Kato et al.
patent: 4883975 (1989-11-01), Enomoto et al.
patent: 4918341 (1990-04-01), Galbraith et al.
patent: 4985644 (1991-01-01), Okihara et al.
patent: 5404051 (1995-04-01), Kobayashi
patent: 5426385 (1995-06-01), Lai
patent: 5430335 (1995-07-01), Tanoi
patent: 5450356 (1995-09-01), Miller

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