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| This paper presents a high resolution X/Ku band frequency synthesizer based on a direct digital synthesizer (DDS) driven phase locked loop (PLL). The DDS, adopted as the reference of the PLL, has a frequency step of 1Hz and a typical phase noise of -140dBc/Hz at the offset of 10KHz. Its fine frequency step enables the synthesizer to have a high resolution at X/Ku band, while the phase locked loop combined with a mixer at half frequency of output signal realizes the performance of low phase noise. A prototype of the X/Ku band frequency synthesizer is developed. Measured results shows that it has an output frequency range of 11.1GHz to 12.9 GHz, a frequency resolution as fine as 10Hz and a typical phase noise of -100dBc/Hz at the offset of 10KHz. |
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| Keywords:frequency synthesizer, X/Ku band, high resolution, phase noise |
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