Abstract
The performance of high frequency synthesizers is often tied to a lower-frequency reference oscillator, such as an oven-controlled crystal oscillator (OCXO), and enormous effort is often required to produce a stable microwave frequency synthesizer with ultra low phase noise. To demonstrate, a 10.24 GHz frequency synthesizer with OCXO reference source in conjunction with Mobius coupled DRO was developed, the measured phase noise is better than -138 dBc/Hz @ 10 kHz offset with noise floor of -174 dBc. A hybrid approach shows great promise in achieving frequency synthesized microwave signals with low phase both close to and far from the carrier; the design path of reported 10.24 GHz synthesizer will be traced in the paper, and not limited to this frequency.
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