| 摘要 |
PURPOSE:To provide a pinch resistance device the functions of a Zener diode of a Zener power source, a bleeder resistance and a diode for temperature compensation by operating the device in the region where the junction part of the pinch resistance device causes a breakdown. CONSTITUTION:The condition that a part of the junction part formed between the first conductive type semiconductor 72 and the second conductive type semiconductor 82 causes a breakdown is utilized actively. Now if the pinch resistance device is operated with an electrode A as a higher potential and an electrode B as a lower potential, within a range Ip>Io, junctions J1 and J2 are forward- biased and show normal diode characteristics whereas a junction J3 causes a breakdown. By flowing the current satisfying Ip>Io into the pinch resistance device, the circuit equivalent to the Zener power source composed of a Zener diode Z and a diode D can be obtained. Also, the Zener power source in a turn-off state present in the region Ip<Io and works as a bleeder resistance. In the Zener power source with turn-off states, only single pinch resistance device is enough and the occupation area of the integrated circuit is substantially reduced. |
