X波段线性调频信号源已在多个领域得到广泛应用。文章采用直接数字频率合成（DDS）激励锁相频率合成（PLL）的技术，弥补了DDS和PLL技术各自的缺点。设计了X波段（10—11GHz）线性调频信号源的实现方案，并对信号源的频率建立时间和相位噪声进行了仿真。最后，重点研究了基于DDS芯片AD9852的锁相环激励信号源的设计。%X-band LFM signal source is widely applied in many areas. On the basis of DDS-driven PLL,this paper makes up for the shortcomings of DDS and PLL. The scheme of the LFM signal source in X-band （10- 11 GHz） is designed, and the frequency locked time and phase noise of signal source are simulated. Based on DDS chip AD9852, the source-driven PLL is further designed.
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