Hi Luijie,
I am really hacking on this evaluation board and I went through all the links available, here are my current conclusion,
1. For the attached Setup and a Ref Clock of 50 MHz and Multiplier 50, the Profile Single tone indication (=FTW) is really showing on the Spectrum Analyzer the correct Tone at 1 GHz.
2 For another Setup file where I can provide only a Ref clock of 20 MHz (and muliplier 50), at Profile 400 MHz , I receive a single tone at 870 MHz !!! (see attached picture).
3. The 20 MHz Ref Clock is a clean Sinus 5Vpp (verified on an Scope) and when sometimes switching it On or Off it seems not having an impact on the Outputtone at all, while using a 50 MHz clock it does have an impact on the tone ....
Any idea why?
Y3G