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在无线通信领域中,高性能频率综合器是通信设备、雷达、电子侦察和对抗设备、精密测量仪器的核心部件。现代通信系统对频率综合器的精度、分辨率、转换时间及频谱纯度等提出了越来越高的要求,性能卓越的频率综合器均通过频率合成技术来实现。以往通过锁相环来实现的频率综合器具有高精度、高稳定度、低相位噪声、低杂散等性能。但是在跳频时间上只能做到几十甚至上百μS。这与某些雷达需要的频率综合器的捷变速度有差距。本文提出一种直接合成方法,很好的解决了这个问题。
In the field of wireless communications, high-performance frequency synthesizers are the heart of communications equipment, radar, electronic reconnaissance and confrontation equipment, and precision measurement instruments. Modern communication systems put forward higher and higher requirements on the accuracy, resolution, conversion time and spectral purity of the frequency synthesizer. The high performance frequency synthesizers are all realized by the frequency synthesis technique. In the past through the PLL to achieve the frequency synthesizer with high accuracy, high stability, low phase noise, low spurious performance. But in the frequency hopping time can only do dozens or even hundreds of μS. This is different from the agility of the frequency synthesizer required by some radars. This paper presents a direct synthesis method, a good solution to this problem.