| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage-controlled oscillation circuit capable of compensating temperature characteristics in a crystal oscillator precisely. SOLUTION: The voltage-controlled oscillation circuit has the crystal oscillator XTAL, an inverter 23, and variable capacitive elements CV1, CV2, converts a temperature compensation current outputted by a temperature compensation circuit 21 to a temperature compensation voltage for applying the current to each variable capacitive element CV1, CV2, and compensates a temperature in the crystal oscillator for stabilizing an oscillation frequency. The voltage-controlled oscillation circuit has current correction means 30, 31 each generating a nonlinear correction current according to the temperature compensation voltage for adding the current to the temperature compensation current. COPYRIGHT: (C)2008,JPO&INPIT
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