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LMX2595: 产生三角调频的FMCW信号,如何知道RAMP开始、结束的时刻?

Part Number: LMX2595
Other Parts Discussed in Thread: LMX2594

用过ADI的ADF4158,可以用MUXOUT来指示ramp斜坡的结束,但是LMX2594/2595似乎没有这个功能?

另外,我尝试用RampCLK信号来控制扫频,结果频谱很乱,而用片内自动扫频就很干净,不知道为什么

用的是2459的评估板,扫频带宽是9G到9.1G,上下坡时间都是400us,鉴相频率50MHz,片内自动扫频,VCO电压测试点能看到三角波

改用RampCLK控制,用信号源产生1.25kHz(周期800us,与片内扫频一样)的方波接RampCLK,VCO电压就有点乱,频谱仪看的频谱也很杂乱