| 摘要 |
A voltage-controlled piezoelectric oscillator includes: an inverter having an input and output; a feedback resistor of the inverter; a first capacitor inserted between the inverter input and the ground potential; a second capacitor inserted between the inverter output and the ground potential; and a series circuit which is composed of a piezoelectric vibrator, two variable-voltage capacitance elements such as variable capacitance diodes, and a third capacitor. Each of the variable-voltage capacitance elements has a first terminal and a second terminal, the first terminals being connected to each other. The oscillator further includes a control terminal for applying a control voltage by way of a resistor to the common connection point of the first terminals, and return resistors inserted between the second terminals of variable-voltage capacitance elements and the ground potential.
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