Research And Design Of X-band Frequency Source

Frequency source has a wide range of applications in modern microwave communication systems, whether radar, electronic countermeasures, aerospace, pharmaceutical, electronic communication frequency source occupies a very important position, the performance of frequency synthesizer directly affects the stability and reliability of the whole system. Along with the science and technology progress of increasingly, frequency source will have more extensive application of frequency synthesizers phase noise and stray also have higher requirements, therefore, frequency synthesizers is always the key research object of the researchers.The work of this paper is to design a X-band point frequency source, that the frequency of the phase noise source and stray have higher requirements, and to the whole frequency source size also has a regulation.This article first describes the dynamic frequency source and he development at home and abroad. And then introduced the basic theory of the frequency source are introduced, and phase lock loop synthesis technology. After considering the related literature reading books and the frequency source design index analysis, comparing the last several solutions to select the most appropriate solutions. Frequency source finally choose the decimal points a VCO frequency and phase lock loop, again through the two times frequency output reached the final index signal. One of the filter used to design loop Hittite company provide loop filter design tools PLL Analysis&Design Tool to complete the loop the design of filter. In order to meet the requirements of the index, in the output before joining a bandpass filter to filter out The Times of the harmonic frequency produce. According to the requirements of the design, use ADS software to bandpass filter optimization of the simulation, the design gives the coupling line parallel to meet the requirements bandpass filter.The test results show that the whole system of the9.7GHz output of phase noise frequency for-85dBc/Hz@1kHz, stray for-63dBc, power output for15dBm. To meet the requirements of the original design index.