ADIsimCLK simulation and VCXO definition

Hi,

I recommend using the help file to understand how to introduce the VCXO data into the ADIsimCLK.

The AD9511 has also a reference design that you could use. This design comes with a VCO that you could modify according to your VCXO.

These are my notes about introducing a 160MHz VCXO in the library. You do not provide all data I need to calculate everything for you:

Click Libraries, VCO Library Editor. Click New and I introduce the name of the model TBD. Click OK.

The Kv of the VCXO may be calculated from its data sheet as 90E-6*160E6/(1.85-1.45)=36000Hz/V. Basically the VCXO can be regulated 160MHz+/-45ppm between 1.45V and 1.85V.

We introduce Kv=36kHz/V in the location.

Then we introduce V1=1.45V, F1=160E6*(1-45E-6)= 159992800Hz, V2=1.85V, F2=160E6*(1+45E-6)= 160007200 Hz

PN floor is from the phase noise diagram -160.6dBc/Hz.

PN level is -73.9 dBc/Hz at 10Hz

Flicker corner is around 100kHz.

The resultant phase nose diagram is pretty close to the one in the data sheet. You may introduce the phase noise as a table as well.

Then I saved it asTBD.Lib into the folder: C:\ProgramData\Applied Radio Labs\ADIsimCLK\lib\VCO (In Windows Explorer select to view the hidden files and folders otherwise this folder will not show)

Then Click on Spec Type and select Model.

In Tuning Law select Data sheet Kv.

Introduce Freq as 160MHz, VCXO Fpull=90 ppm

Click Save. I saved everything in the TBD.Lib.

Now close the editor. In the ADIsimCLK, click Libraries, then Reference Library Editor to introduce the characteristics of the reference clock you intend to provide. Use Help menu to guide you through the process.

I then clicked on Edit, Configuration. I clicked Next until I arrived at the VCXO selection window, I selected the VCO entry with the data I just introduced.

Petre

Hi,

I recommend using the help file to understand how to introduce the VCXO data into the ADIsimCLK.

The AD9511 has also a reference design that you could use. This design comes with a VCO that you could modify according to your VCXO.

These are my notes about introducing a 160MHz VCXO in the library. You do not provide all data I need to calculate everything for you:

Click Libraries, VCO Library Editor. Click New and I introduce the name of the model TBD. Click OK.

The Kv of the VCXO may be calculated from its data sheet as 90E-6*160E6/(1.85-1.45)=36000Hz/V. Basically the VCXO can be regulated 160MHz+/-45ppm between 1.45V and 1.85V.

We introduce Kv=36kHz/V in the location.

Then we introduce V1=1.45V, F1=160E6*(1-45E-6)= 159992800Hz, V2=1.85V, F2=160E6*(1+45E-6)= 160007200 Hz

PN floor is from the phase noise diagram -160.6dBc/Hz.

PN level is -73.9 dBc/Hz at 10Hz

Flicker corner is around 100kHz.

The resultant phase nose diagram is pretty close to the one in the data sheet. You may introduce the phase noise as a table as well.

Then I saved it asTBD.Lib into the folder: C:\ProgramData\Applied Radio Labs\ADIsimCLK\lib\VCO (In Windows Explorer select to view the hidden files and folders otherwise this folder will not show)

Then Click on Spec Type and select Model.

In Tuning Law select Data sheet Kv.

Introduce Freq as 160MHz, VCXO Fpull=90 ppm

Click Save. I saved everything in the TBD.Lib.

Now close the editor. In the ADIsimCLK, click Libraries, then Reference Library Editor to introduce the characteristics of the reference clock you intend to provide. Use Help menu to guide you through the process.

I then clicked on Edit, Configuration. I clicked Next until I arrived at the VCXO selection window, I selected the VCO entry with the data I just introduced.

Petre

PDF

This is the datasheet of my VCXO. 

The number 90E-6 you used, correspond to the VCXO modulation bandwidth or is the APR ?

Thanks,

Edoardo Vitali

Hi,

90E-6 represent the full range of +/-45ppm, i.e. 90ppm.

According to your data sheet, the range is +/-50ppm, so use 100E-6 in my expressions

Petre