Patent ID: 7196888
Filing Date: 2007-03-27
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor integrated circuit device including a protection circuit and a terminal to which the protection circuit is connected, the protection circuit comprising a protection diode and a current mirror circuit consisting of first and second transistors having bases thereof connected together, having emitters thereof connected together, and having the emitters thereof connected to an anode of the protection diode, comprising the steps of: forming the anode of the protection diode; forming a cathode of the protection diode so as to surround the anode thereof and so as to be connected to the terminal; forming a collector of the first transistor so as to surround about a half of the anode within a region surrounded by the cathode; forming a collector of the second transistor so as to surround about another half of the anode; and forming the bases of the first and second transistors as a common base so as to be substantially parallel to an edge of the collectors of the first and second transistors.