| 摘要 |
PURPOSE:To bring substrate potential quickly to a fixed value by providing a control means with one control means inhibiting the operation of the control means when a power supply is turned ON. CONSTITUTION:Since a limiting circuit 5 is designed so as to inhibit the operation of a control circuit 3 at all times when a power supply is turned ON, a second substrate bias generating means 2 having large capacitance is operated when the power supply is turned ON. When an input terminal 6 reaches a high level, a transistor 7 is turned ON, a gate for a transistor 10 reaches the high level, thc transistor 10 is turned ON, and an output terminal 11 reaches a low level. Since a capacitor 8 is charged at that time, the gate for the transistor 10 holds the high level even when the input terminal 6 reaches the low level after that, and the output terminal 11 continues to hold the low level. |
