| 摘要: |
| 为了满足航天测控信道的要求，提出了一种高性能L频段频率合成器设计的改进方案,采用PLL+DDS+PLL结构实现了小步进、低杂散、低相噪的信号输出。分析了方案的可行性，设计了样品，并进行了测试，结果显示其相位噪声优于-100 dBc/Hz@10 kHz，杂散优于-75 dBc，但附加的杂散信号导致了系统同频干扰。通过分析找出引起同频干扰的机理，并提出了相应的改进措施。所提方案对测控通信、电子对抗等领域中频率合成器的研发具有一定的参考价值。 |
| 关键词: 航天测控信道 L频段频率合成器 PLL+DDS+PLL结构 同频干扰 改进设计 |
| DOI： |
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| 基金项目: |
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| Improved design of an L-band high performance frequency synthesizer |
| YIN Mei-liang,LIU Xiang-qian |
| () |
| Abstract: |
| An improved scheme for L-band high performance frequency synthesizer design is presented to meet the requirement of space TT&C channel.In this scheme PLL+DDS+PLL structure is used to realize small step-size,high spectrum purity and low phase noise.The feasibility of scheme is analyzed,a synthesizer is developed and tested.The result shows that its phase noise is better than -100 dBc/Hz@10 kHz and its spurious suppression is better than -75 dBc. But the additive spurious results in co-frequency interference.The reason causing co-frequency interference is found out through analysis and corresponding measures are proposed.The proposed design scheme provides reference for developing synthesizers applied in TT&C communication and electronic countermeasure(ECM). |
| Key words: space TT&C channel L band frequency synthesizer PLL+DDS+PLL structure co-frequency interference improved design |
