Investigation of phase locking of microwave oscillators
Clark, Jackie Lee.
Hoisington, David B.
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This paper is a report on experimental thesis work which investigated phase locking of a reflex klystron with a more stable microwave source. A discussion of the characteristics and components of a phase-locked loop and a qualitative overview of the theory of phase-locked loop operation is included. The specific circuit which accomplished phase locking at approximately 9.1 GHZ is described, with particular emphasis on the use of a crystal mixer to provide the phase-sensitive feedback voltage for klystron frequency control. Capture and tracking ranges of this phase-locked loop are predicted and determined experimentally. The stabilization of the reflex klystron frequency by the phase-locked loop is demonstrated by spectrum photographs. A phase detector circuit which is expected to provide a wide capture and tracking range with the VCO offset from the reference frequency is proposed and described. Progress toward realization of this detector and suggestions for its improvement are included in this report.
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