Digital interface circuit with dual switching points for increas

Details Digital interface circuit with dual switching points for increas Digital interface circuit with dual switching points for increas

1994-08-29

1996-01-30

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327108, H03K 5153

Patent

active

054883229

ABSTRACT:
A buffer, driver, or level-shifting circuit having an input connected to signal inputs of a pair of comparators and an output connected between a pair of pull-up and pull-down transistors controlled by the comparators. A first reference voltage applied to the reference input of the comparator controlling the pull-up transistor is selected to be less than the nominal transition point of the circuit, while a second reference voltage applied to the reference input of the comparator controlling the pull-down transistor is selected to be greater than the nominal transition point of the circuit, thereby allowing the circuit to recognize the beginning of signal transitions on the its input sooner. The comparators are differential amplifiers which are enableable and disableable in response to a feedback signal from the circuit's output in order to reduce current consumption during transitions. When the output is high, the comparator controlling pull-down is enabled, while the comparator controlling pull-up is disabled. When the output is low, the comparator controlling pull-up is enabled, while the comparator controlling pull-down is disabled. Undershoot and overshoot control circuitry may be provided by replacing the single pull-up transistor, pull-down transistor, or both with pairs of parallel transistors whose combined conductance is comparable to that of the replaced transistor. One of the parallel transistors is turned off after the nominal transition point has been reached on the circuit's output, thus slowing pull-down or pull-up during the latter part of the transition when speed no longer matters.

REFERENCES:
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patent: 4806794 (1989-02-01), Walters, Jr.
patent: 4825101 (1989-04-01), Walters, Jr.
patent: 4987324 (1991-01-01), Wong et al.
patent: 5008568 (1991-04-01), Leung et al.
patent: 5034623 (1991-07-01), McAdams
patent: 5043599 (1991-08-01), Zitta
patent: 5059821 (1991-10-01), Murabayashi et al.
patent: 5165046 (1992-11-01), Hesson

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