| 摘要 |
PROBLEM TO BE SOLVED: To provide a VCXO circuit capable of realizing miniaturization by reducing the number of elements, and capable of switching two-frequency signals having excellent spurious characteristics. SOLUTION: This frequency selective crystal oscillator consists of a crystal oscillator 1 having a source oscillation frequency of 155.52 MHz; crystal oscillator 2 having a source oscillation frequency of 166.686 MHz; changeover switch 3; surface wave filter 4 having a pass bandwidths of frequencies of 622.08 MHz and 666.5143 MHz being four multiple of the source oscillation frequencies of the crystal oscillators 1, 2; and wide-band amplifier 5 for amplifying the bands of the frequencies of 622.08 MHz and 666.5143 MHz. COPYRIGHT: (C)2004,JPO&NCIPI
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