Patent ID: 8692289

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a first well of a second conductivity type formed into the semiconductor substrate; a second well of the second conductivity type formed into the semiconductor substrate spaced from the first well; a first diffused region of the first conductivity type formed at an upper surface of the first well and coupled to a first terminal; a first diffused region of the second conductivity type formed at the upper surface of the first well; a second diffused region of the first conductivity type formed at the upper surface of the second well and coupled to the first diffused region of the second conductivity type; a second diffused region of the second conductivity type formed at the upper surface of the second well and coupled to a second terminal; and another diffused region of the first conductivity type formed at the upper surface of the first well, the first diffused region of the second conductivity type being interposed between the first diffused region of the first conductivity type and the another diffused region of the first conductivity type; wherein the first diffused region of the first conductivity type and the first diffused region of the second conductivity type form a first diode, and the second diffused region of the first conductivity type and the second diffused region of the second conductivity type form a second diode, and the first and second diodes are series coupled between the first terminal and the second terminal.