Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1997-04-17
1999-08-24
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327314, 327320, 327328, 361 92, H03K 508
Patent
active
059429313
ABSTRACT:
A first MOS transistor (5) is provided between a power source terminal and an input terminal (3). A second MOS transistor (6) is provided between a ground terminal (2) and the input terminal (3). The gate of the first MOS transistor (5) is electrically connected to a node (8) and a resistor (9) is electrically connected between the node (8) and another ground terminal (2). The gate of the second transistor (6) is electrically connected to the ground terminal (2). When negative pulse-shaped static electricity is applied to a circuit constructed as described above, the potential applied to the gate of the first MOS transistor (5) is limited low by a voltage drop developed across the resistor (9). Therefore, the current flowing between the source and drain of the first MOS transistor (5) can be controlled low and a substrate current produced due to impact ionization can be prevented from flowing. It is thus possible to obtain a stabler operation of a semiconductor integrated circuit device.
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Cunningham Terry D.
OKI Electric Industry Co., Ltd.
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