| 摘要 |
PURPOSE: An apparatus for providing a reference signal is provided to eliminate spurious waves by constituting a bandpass section with a SAW(Surface Acoustic Wave) filter or a ceramic filter. CONSTITUTION: A frequency adjusting section(1500) provides a frequency-fixed output signal by controlling frequencies through digital processing of input signals along with a digital control signal. A first bandpass section(1610) passes a first band from signals transferred from the frequency adjusting section. A second bandpass section(1620) passes a second band from signals transferred from the frequency adjusting section. A second low pass section(1800) passes signals having the frequencies below a predetermined frequency from the signals transferred from the first bandpass section or the second bandpass section. |
