| 摘要 |
PROBLEM TO BE SOLVED: To reduce an occupied area of a ring oscillator or an inverter chain which is provided in a semiconductor device while preventing threshold value fall.SOLUTION: In a ring oscillator or an inverter chain which has a capacitative element composed of unipolar transistors, potential of a gate of an inverter is boot-strapped by the capacitative element and lowering of output potential is inhibited. It is preferable that the plurality of unipolar transistors may be stacked and, in some transistors, electrodes which become equal potential are shared among overlapped plurality of transistors. The capacitative element can be used for preventing threshold value fall of potential at predetermined wiring. |
