Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Reexamination Certificate
2006-11-07
2006-11-07
Deberadinis, Robert L. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
C361S111000, C361S056000
Reexamination Certificate
active
07133269
ABSTRACT:
An overvoltage protection circuit for a receiver including first and second pass devices and a protection control circuit. The receiver detects the state of a high voltage level input signal using a switching threshold based on a low voltage level source voltage. The receiver has a maximum voltage limit between the low and high voltage levels. The first pass device passes the input signal up to a first voltage level below the source voltage. The second pass device is effectively coupled in parallel with the first pass device. The protection control circuit controls the second pass device to allow the input signal to rise above the first voltage level up to a threshold voltage that is above the source voltage sufficient to meet the logic switching threshold yet below the maximum voltage limit.
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Adel S. Sedra□□Microelectronics Circuits□□1987□□CBS College Publishing□□Second Edition□□p. 345.
Deberadinis Robert L.
Huffman James W.
Huffman Richard K.
Román Luis E.
Stanford Gary R.
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