| 摘要 |
A drive circuit includes a first field effect transistor having a source connected to an input terminal and a drain and a gate connected in common, a second field effect transistor having a drain to a first power supply terminal, a source connected to an output terminal and a gate connected to the gate of the first transistor, a first current control circuit connected between the first power supply terminal and the drain of the first transistor, a second current control circuit connected between the input terminal and a second power supply terminal, and a third current control circuit connected between the output terminal and the second power supply terminal. Accordingly, the gate of the second transistor is biased with a voltage that is deviated from an input voltage by a gate-source voltage of the first transistor, so that the second transistor operates in a source-follower fashion without oscillation. Thus, the drive circuit can be constructed without including a capacitor, and therefore, a required circuit area can be reduced.
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