This paper describes improvement of phase noise characteristics of an Fr oscillator. We have examined the configuration of the Fr oscillator, the loaded Q of which is improved by using matching network, and we have predicted value of the loaded Q. Furthermore, we actually made several configurations of Fr oscillator and measured the SSB phase noise. We show the measured loaded Q of Fr oscillator is corresponding to the calculation results well, and the phase noise characteristics are improved by decreasing characteristic impedance of the frequency selective circuit.
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