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US 5,077,496 AGranted
Logic tracking interface circuit
AssigneeNorthern Telecom Limited
InventorJohn A. Wolczanski
Life of this patent
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Abstract
A logic tracking interface circuit includes a signal comparator, a feedback comparator and a logic gate of the type to be driven by the interface circuit. The mean of the inverting and noninverting outputs of the signal comparator is applied as an input to the feedback comparator, the other input being provided by the logic gate. The inverted output of the feedback comparator is used to control the common mode of the signal comparator.
Claims13
A logic tracking interface circuit comprising:
- a signal comparator means having first and second signal inputs, a control input, and first and second outputs;
- a potential divider, connected between the first and second outputs of the signal comparator means, for providing a means signal value;
- and
- a feedback comparator means, having first and second inputs and an output, the first input of the feedback comparator means being connected to the potential divider for receiving the means signal value from said signal comparator means and the output of the feedback comparator means being connected to the control input of said signal comparator means;
- wherein the second input of the feedback comparator means is connected to a sample logic gate of a type being driven by said interface circuit for providing a decision level.
2 more elements
Dependencies are inferred from the claim text.