The purpose of the present invention is to provide a frequency synthesizer which does not have spurious components. Automatic reference correcting circuit 4 is provided to frequency synthesizer 1 which changes the frequency division value of the divider and makes the frequency of external output signal...http://www.google.com.hk/patents/US6130925?utm_source=gb-gplus-share專利 US6130925 - Frequency synthesizer
