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For X-band radar velocity measurement system, a low phase noise and low spurious frequency source is designed as the local oscillator of the receiver and the transmitter to improve the SNR and the receiver sensitivity. The design uses phase-locked loop chip HMC778 integrated with VCO from AD company. The reference frequency source is OCXO of low phase noise from KOMA company, and loop filter is active...
Fast-switching PLL is analyzed and designed. Using VCO pre-tuning method, the PLLpsilas pull-in time is greatly reduced. Problems that should be considered in the design of each part of PLL are introduced, the designed prototype is showed and the test results are given. Frequency hopping time of designed PLL is less than 10 us in the frequency range of 1 GHz to 1.35 GHz, with the phase-detecting frequency...
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