Input protecting circuit for a semiconductor circuit component

Details Input protecting circuit for a semiconductor circuit component Input protecting circuit for a semiconductor circuit component

1982-06-18

1984-07-17

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

357 23, H02H 904

Patent

active

044609353

ABSTRACT:
An input protecting circuit for a semiconductor circuit component having an input terminal, which is powered by a direct current power source, is provided with a series circuit having a first diode connected in series with a biasing element, the series being connected across the direct current power source. The first diode is forward-coupled. A second diode is further provided the second diode being reversely-coupled between a junction of the first diode and the biasing element, and the input terminal of the semiconductor circuit component. This input protecting circuit operates so as to prevent a signal level at the input terminal from being greater than the supply voltage of the direct current power source. An additional first diode and second diode may be provided, the additional first diode being in the series circuit and the additional second diode being associated with the biasing element so as to prevent a positive or negative input signal from being greater than the supply voltage.

REFERENCES:
patent: 4390919 (1983-06-01), Lesinski
"Overvoltage Protection for Driver Circuits"-Bidendorf et al., IBM Technical Disclosure Bulletin, vol. 17, No. 11, pp. 3289-3291, 4/75.
Ryoji Gamo, "Anarogu-Kairo No Toraburu Taisaku", (How to Cope with Problem of Analogue Circuit), Tokyo: CQ Shuppan Kabushiki Kaisha, 1977, pp. 188-190.

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