Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – Having selection between plural continuous waveforms
Patent
1995-05-31
1996-10-15
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
Having selection between plural continuous waveforms
327205, 326 22, H03K 1700
Patent
active
055658032
ABSTRACT:
A digital input circuit including a first digital buffer for receiving a digital data signal and for providing a first buffered digital data output, the first digital buffer having a first switching threshold voltage; a second digital buffer for receiving the digital data signal and for providing a second buffered digital data output, the second digital buffer having a second switching threshold voltage that is greater than the first predetermined switching threshold voltage; a selection circuit responsive to the first buffered digital data output and the second buffered digital data output for providing a selection circuit output that is a replica of the first buffered digital data output or the second buffered digital data output; and a flip-flop for receiving the selection means output and providing a flip-flop output that is indicative of the logical state of the digital data signal. The selection circuit is controlled by the output of the flip-flop such that the selection circuit output is a replica of the first buffered digital data output when the flip-flop output indicates that the digital data signal is of a first state that is represented by a first predetermined voltage, and such that the selection circuit output is a replica of the second buffered digital data output when the flip-flop output indicates that the digital data signal is of a second state that is represented by a second predetermined voltage that is greater than the first predetermined voltage.
REFERENCES:
patent: 4529892 (1985-07-01), Reilly et al.
patent: 5418409 (1995-05-01), Kuhn
Alkov Leonard A.
Callahan Timothy P.
Denson-Low Wanda K.
Hughes Aircraft Company
Kim Jung Ho
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