| 摘要 |
While an oscillation function is given to a ring oscillator ( 102 ) by series-connecting the odd number of logic inverting circuits (INV 1 to INV 5 ) to each other and by feeding back an output of the logic inverting circuit provided at a final stage to an input of the logic inverting circuit provided at a first stage, sources of source follower FETs (P 21 to P 25 ) for constituting the ring oscillator, which correspond to the logic inverting circuits and whose drains are grounded are connected to nodes of the respective logic inverting circuits on the power supply sides thereof, and a stabilized bias voltage is applied to the respective gates of the source follower FETs.
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