How can I see the review by the administrator?

Hey y_suzuki , can you please confrim where you were posting and what the content was?

Hello stephenv,

Thank you for your prompt reply.
I attach the text of the question. 
I'd appreciate it if you could review the content and determine the cause of the error.

Best regards,

y_suzuki

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Subject: ADF4360-0: Effect of IC package differences on spectrum spread width during frequency setting

Hello,

Now I post a question that is related for 
https://ez.analog.com/rf/f/q-a/597184/adf4360-0-how-to-control-the-hopping-frequency-at-the-settling-to-new-frequency?ReplySortBy=CreatedDate&ReplySortOrder=Descending

Now we have requested to the customer which are your suggested three checkpoints.
I'd inform you when we get the results.

There are additional questions from the customer.

1. 
As stated in PCN 14_0020 Rev. A, the ADF4360-0 package was changed in 2014.  
The package before the change was ‘CP-24-2,’ and the package after the change is ‘CP-24-14.’
When customers measured the frequency spectrum, including the transient response during VCO calibration, by setting the spectrum analyser to peak hold mode and performing a step sweep in the 2.4 GHz to 2.5 GHz range, they found that the ‘CP-24-2’ and ‘CP-24-14’ packages exhibited significantly different characteristics.

CP-24-14 package (after PCN 14_0020 Rev. A)


CP-24-2 package  (before PCN 14_0020 Rev. A)


The customer wants to know whether the difference in the spread of the frequency spectrum is due to individual differences in the ADF4360-0, or whether it is a difference between the ADF4360-0 before PCN and the ADF4360-0 after PCN.
If this difference is due to individual differences in the ADF4360-0, this customer says that they cannot use the ADF4360-0.

Even with ADF4360-0 after PCN, is it possible for the spectrum to spread out like ‘ADF4360-0_2.png’?


2. Changing the VCO current value of the ADF4360-0 changes the spectrum spread width when performing a step sweep. Does this spread width show the same trend even when replacing the unit?
In the ADF4360-0 after PCN, the spread of frequency spectrum differs between settings of 15 mA and 20 mA for the VCO current.

VCO current: 15mA.


"VCO current: 20mA


When he set the VCO current to 20 mA, the frequency spectrum spread looks like narrower than when it was 15 mA.
When using step sweeping, the customer wants to narrow the frequency spectrum spread, but will the relationship between the VCO current and the frequency spectrum spread remain the same even if the device is changed to other ADF4360-0??
(Has it been confirmed in the design data that increasing the VCO current tends to prevent the spectrum from widening?)

Settings of ADF4360-0 are as follows:
 - Reference: 10MHz
 - R counter: 100
 - PFD freq.: 100kHz
 - Frequency step for sweep:100kHz
 - Start frequency: 2.4GHz
 - Stop frequency: 2.5GHz
 - Loop filter BW: 6.25kHz
 

Loop Filter:


Output circuit:
 


If you need more information to consider this behavior, please let me know.
Best regards,

y_suzuki

This has been posted on your behalf and will not be an issue going forward: ez.analog.com/.../adf4360-0-effect-of-ic-package-differences-on-spectrum-spread-width-during-frequency-setting

Hello stephenv,

Thank you for your support.
I added some pictures, which are needed to explain the issue, to the text.
I'd appreciate knowing the cause of the error.

Best regards,

y_suzuki