介绍了一种基于锁相环及频率合成方法产生高重复频率正弦同步扫描种子源产生技术。利用锁相环实现了正弦信号与触发光脉冲的同步跟踪，并通过频率合成实现对正弦小信号的频率、相位、幅度的调制。调制相位可实现扫描时间的延迟，调节振幅可实现不同扫描速度。电路系统进行了实验测试，获得频率可达250 MHz、时间抖动小于10 ps的稳定正弦同步扫描种子源，证明设计达到了预期目标，满足光学条纹相机对种子源频率、幅度、抖动的高精度需求。

A new technique to generate high frequency repeated sine synchronous scan seed source was introduced, based on the method of phase locked loop and direct digital synthesize technique. Phase locked loop was used to realize synchronous track of sine scan signal and trigger light impulse. Modulation of frequency, phase, and amplitude was achieved by direct digital synthesize technique. Delay of scan time was achieved by phase modulation, while different scanning rate was achieved by amplification modulation. The circuit system can obtain stable sine synchronous scan seed signal with frequency as high as 250 MHz, and jitter lower than 10 ps. The design is confirmed to meet the expectation, and fulfill the high precision requirements of streak camera on seed source for frequency, amplitude and time jitter.