| 摘要 |
<p>The semiconductor device comprises a semiconductor substrate 10 of a first conduction type, a first well 32a of the first conduction type formed in the semiconductor substrate 10, a second well 32b of a second conduction type formed in the semiconductor substrate 10, and an impurity layer 14 of the second conduction type buried in the semiconductor substrate 10 below the first well 32a and below the second well 32b and connected to the second well 32b, for applying a bias voltage to the second well 32b, a contact region 34 of the first conduction type are formed selectively in the impurity layer 14 immediately below the first well 32a, and the first well 32a is connected to the semiconductor substrate 10 via the contact region 34.</p> |
