| 摘要 |
A crystal oscillator circuit including a quartz vibrator; an inverter circuit connected in parallel to the quartz vibrator and comprised of at least two transistors connected at their output ends to a first power-supply potential or a second power-supply potential lower than the first power-supply potential; a first current mirror circuit, with one current input-output end connected to a connection line with the inverter circuit of the first power-supply potential, the other current input-output end connected to the output end of the oscillator circuit; and either a second current mirror circuit having two current input-output ends, one current input-output end connected to a connection line with the inverter circuit of the second power-supply potential, the other current input-output end connected to the output end of the oscillator circuit, current flowing to one current input-output end, current flowing to the other current input-output end, and the level of the output end of the oscillator circuit being shifted to the level of the second power-supply potential when the output end of the inverter circuit is connected to the second power-supply potential or a circuit for shifting the level of the output end of the inverter circuit to the level of a second power-supply potential in accordance with the level of the input end of the inverter circuit when the output end of the circuit is connected to a second power-supply potential.
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