| 摘要 |
A crystal oscillator includes a clock generator, first and second capacitors, a crystal oscillator, a variable capacitance diode, and a voltage generating circuit. The crystal oscillator is connected between the input pin and the output pin of the clock generator, and connected between the first terminal of the first capacitor and the first terminal of the second capacitor. The variable capacitance diode is connected between the second terminal of the first capacitor and the second terminal of the second capacitor. The voltage generating circuit is connected between two terminals of the variable capacitance diode to supply different voltages for the variable capacitance diode to change a junction capacitance of the variable capacitance diode, to change a resonant frequency of the crystal oscillator. |
