Circuit and method for enhancing logic transitions appearing on a line
AssigneeMotorola, Inc.
InventorsJames S. Caravella, Ben Gilsdorf
Life of this patent
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Abstract
A circuit (10) for enhancing logic transitions appearing on a line (34) has been provided. The circuit includes a first comparator (14) for sensing when a voltage on the line exceeds a first level and subsequently pulling the voltage on the line to a first predetermined voltage. The circuit also includes a second comparator (12) for sensing when the voltage on the line falls below a second level and subsequently pulling the voltage on the line to a second predetermined voltage.
Claims8
A circuit for enhancing logic transitions appearing on a line, comprising:
- a first comparator having first and second inputs, an enable input, and an output, said first input of said first comparator coupled to the line, said second input of said first comparator coupled to receive a first reference voltage;
- a second comparator having first and second inputs, an enable input, and an output, said first input of said second comparator coupled to the line, said second input of said second comparator coupled to receive a second reference voltage;
- a first transistor having first and second current carrying electrodes and a control electrode, said first current carrying electrode of said first transistor coupled to the line, said second current carrying electrode of said first transistor coupled to a first supply voltage terminal;
- a second transistor having first and second current carrying electrodes and a control electrode, said first current carrying electrode of said second transistor coupled to the line, said second current carrying electrode of said second transistor coupled to a second supply voltage terminal;
- and
- control means having inputs coupled to said outputs of said first and second comparators for alternately enabling said first and second comparators and for alternately enabling said first and second transistors, said control means having outputs coupled to said enable inputs of said first and second comparators and to said control electrodes of said first and second transistors.
A circuit for enhancing logic transitions appearing on a line, comprising:
- first means, responsive to a first control signal, for sensing when a voltage appearing on the line exceeds a first level, said first means having an input coupled to the line and an output;
- second means, responsive to a second control signal, for sensing when a voltage appearing on the line falls below a second level, said second means having an input coupled to the line and an output;
- third means, responsive to a third control signal, for pulling said voltage appearing on the line to a first predetermined voltage;
- fourth means, responsive to a fourth control signal, for pulling said voltage appearing on the line to a second predetermined voltage;
- and
- fifth means having inputs coupled to said outputs of said first and second means for alternately enabling said first and second means and for alternately enabling said third and fourth means, said fifth means having outputs for providing first, second, third and fourth control signals respectively to said first, second, third and fourth means.
Dependencies are inferred from the claim text.