Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1977-08-17
1980-09-23
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307209, 307268, 307360, 328164, H03K 508
Patent
active
042245346
ABSTRACT:
A method and apparatus for converting a tri-state logic signal into a two-state logic signal accurately and repeatably for purposes of signal measurement. In particular, the method and apparatus deal with how the third, or high impedance state is translated into a high or a low state. This is accomplished by including a resistor of a selected value to form a voltage divider with the resistance of the path through which the stray capacitance of the circuit under test charges during these intervals. Thus, the level of the final voltage charge is limited to a selected voltage that is intermediate the high and low state threshold voltages of that circuit. The initially conditioned signal, now a true tri-stage signal, is next applied to two threshold detectors, whose outputs in turn are applied to a state machine. This combination generates a repeatable two-state signal by identifying each occurrence of the third state as the last previous high or low state, i.e., the output of the conditioning circuit does not switch to the other state until both thresholds have been crossed by the signal in either direction, at the clock time. The resultant signal from the conditioning circuit has only two predictable and repeatable states, the low and the high states.
REFERENCES:
patent: 3543170 (1970-11-01), Diederich
patent: 3723649 (1973-03-01), Pitegoff et al.
patent: 3976864 (1976-08-01), Gordon et al.
Hewlett--Packard Company
Jones Allston L.
Zazworsky John
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