Active solid-state devices (e.g. – transistors – solid-state diode – Heterojunction device – Light responsive structure
Patent
1994-12-21
1995-11-14
Mintel, William
Active solid-state devices (e.g., transistors, solid-state diode
Heterojunction device
Light responsive structure
257462, 257465, 257491, 307100, 307117, H01L 2714, H01L 3100
Patent
active
054669545
ABSTRACT:
A phototransistor is provided with a first resistor that operates as a shunt and a second resistor that operates to protect the device from damage that could be caused by a reverse bias condition. The possible damage results from the creation of a PN junction relationship caused by the doping of N conductivity type material with P.sup.+ conductivity type material in order to form the first resistor. This junction relationship creates a parasitic diode that provides a current path between the emitter and collector terminals of the phototransistor. In order to prevent damage that might occur during a reverse voltage connection, a second resistor is connected between the emitter of transistor Q.sub.1 and the first resistor. The second resistor is in series with the junction relationship resulting from the structure used to form the first resistor and therefore serves to limit the current flowing between the emitter and collector terminals of the transistor under reversed bias conditions.
REFERENCES:
patent: 2944765 (1960-07-01), Stuetzer
patent: 2948815 (1960-08-01), Willems et al.
Aizpuru Jose J.
Matzen Walter T.
Honeywell Inc.
Lanyi William D.
Mintel William
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