| 摘要 |
PURPOSE:To enable to apply the lowest voltage to a semiconductor substrate of an integrated circuit in which an analog circuit and a digital circuit are mixed by pure aluminum wirings without fail by contacting wirings for applying the lowest voltage by providing a dummy land at one side. CONSTITUTION:An n type dummy land 7 is formed by diffusing or ion implanting n type impurity on a p type semiconductor substrate 2. Wirings 4A are ohmically contacted with the substrate through a subcontacting window 6A of large area with the land 7 and aluminum wirings 4A, and connected to the emitter region E of an n-p-n type transistor 5A. In this manner, a diode D is formed between the substrate 2 and the land 7, and even if a resistor R is connected between the contacting regions 6D and 6A, the connection is interrupted by a diode D of floating state, and the variation in the voltage of the wirings 4A is not transmitted to the wirings 4D. |
