Combining the advantages of digital frequency synthesizer (DDS) and integrated phase-locked loop (PLL), a high-resolution, low-spurious, wide-band frequency synthesizer composed of DDS chip AD9954 and integrated phase-locked loop chip ADF4113 was developed and designed, and the frequency synthesizer was analyzed and simulated. From the simulation and test results, the frequency synthesizer has achieved the design goal. The output frequency range of the frequency synthesizer is 594~999 MHz, the frequency step is 5 Hz, and the phase noise is -91 dBc/.
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