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PLLatinum Sim

I need some advice regarding PLLatinum Sim.

The software version is Figure 1.
When the saved data is read back, the result is shown in Figure 2.
After that, input the same value to Fout and the result will change as shown in Figure 3.
Next, change the VCO from "VCO1" to "VCO2" and the result will be shown in Figure 4.
Finally, when VCO is returned to "VCO1," Figure 5 shows the same characteristics as in Figure 1.


Why does the characteristic change even though the same value is input to Fout (without changing other parameters)?
Is it because of poor usage?

Regards,
Akihiko Yokouchi

 fig1

 fig2

 fig3

 fig4

 fig5