I can't control the channel divider correctly . If I set the VCO frequency at 14GHz, channel divider preforms the same when I set different values.For example, setting 2*2*8*2 the RFoutB outputs the same as setting 2*3*8*1,is 291.66MHz
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I can't control the channel divider correctly . If I set the VCO frequency at 14GHz, channel divider preforms the same when I set different values.For example, setting 2*2*8*2 the RFoutB outputs the same as setting 2*3*8*1,is 291.66MHz
Hello Hao,
Thanks for your reply! I mean the channel divider is not responding correctly. Of course I set FCAL_EN on when I use the board. Lock detecter is on so I think the frequency of the VCO is correct.
Regards,
Minglong
Hello Hao,
Thanks for your reply. I did as your told me, but the channel divider still preformed abnormally when the frequency is set higher than 14000MHz(works normally when frequency is lower than 12000MHz).
Regards,
Minglong
Hello Hao,
I mean that above 14GHz, the channel divider works abnormally. In some cases I change the value of the channel divider,the spectrum analyzer shows that the frequency is not changed.As the picture I showed earlier, I set the output to 291.66MHz by the channel divider,and this time the output was 291.66MHz exactly. But when I changed the value of channel divider to let the device to output 437.5MHz, it didn't responded to me correctly,the spectrum analyzer showed that the output was still 291.66MHz. Some other values I tried had the same problem.
Regards,
Minglong
Hi Minglong,
If you hover your mouse over the "Channel Divider" box (The one that turned red), you can see the error message "The maximum VCO frequency for a channel divide of 8 or greater is 11.5GH", although I don't know why it didn't turn red on your GUI. Maybe something was blown up in a recent update. But this should be the answer to this problem.
Regards,
Hao