ADF4371 with HMC1031/ADF4002, 20dB Phase Noise hit at 100Hz Foffset

Hi ADI,

I have an eval for the ADF4371 and I'm using an HMC1031 eval to lock the 100MHz ref to a precision 10MHz OCXO.  I am generating an 18GHz LO.  As seen here:

The problem here is measured PN at 100Hz offset.  With the on-board crystal reference PN @ 100Hz = -87dBc/Hz.  With HMC1031 PN @ 100Hz = -67dBc/Hz.

Notable design parameters:

- HMC1031 Loop BW set to 10Hz as outlined in the spec sheet page 12.  www.analog.com/.../hmc1031.pdf

- 100MHz VCXO, CVHD-950, CMOS output

- The measure slew rate from the HMC1031/CVHD-950 better than on board 100MHz reference.

Thanks in advance!

Chris



Added other parts to title
[edited by: aandrews at 4:14 PM (GMT -4) on 24 Sep 2021]
Parents
  • +1
    •  Analog Employees 
    on Oct 23, 2020 12:06 PM

    Hi Chris,

    The Flicker FOM of HMC1031 is -252dBc/Hz. This gives -112dBc/Hz @ 100Hz offset @ 100MHz output.
    PNFLICK = Flicker FOM + 20log(fVCXO) − 10log(fOFFSET)

    If this is transferred to 18GHz;
    -112 -20log(18G/100M) = -67dBc/Hz.

    If I did not make any mistake in calculations, math says that your measurement is very accurate. The contributions from other sources (OCXO, VCXO, PLL floor FOM, loop filter) are not significant.

    When using CVHD in open loop, I would also expect to see something close to -87dBc/Hz. But it is possible that the instrument cannot track the signal as you advised. Perhaps you can try to force Vtune to a mid-level instead of connecting it to GND. Min and max levels might be problematic.

    Regards,
    Kazim

  • Hi Kazim,

    So based on the recommendations here:

    https://ez.analog.com/clock_and_timing/f/q-a/167636/easy-to-use-jitter-attenuator-reference-cleanup-loop-examples/379866#379866

    It looks like the ADF4002 would be a good fit to improve my phase noise performance by an additional 7dB based on the improved 1/f FOM of -259dBc/Hz of the ADF4002 vs. -252dBc/Hz for the HMC1031.

    However, I am not able to realize the performance suggested by the ADF4002 model in ADIsimPLL.  I am seeing generally the same performance with both the ADF4002 and the HMC1031.  I've been through a couple iterations on the loop filter and have double checked the setting in the Integer N software.  So I'm kind of stuck, any suggestions?

    Regards,

    Chris

  • Hi Kazim,

    Yes, you are correct the LBW for the 1031 is set to 10Hz and the 4002 is 5kHz.  I initially tried to design a 10Hz loop filter for the 4002 but it was looking like the values were unrealizable or unusually large at least.  So I set LBW to 5kHz thinking the 100Hz offset was going to be dominated by the chip anyway and I could revisit the LBW after I confirmed the performance.  I will take another look at this.

    Here is the tuning gain used for the SimPLL model, data points are measured:

  • Hi Alex,

    I did not write any code to program the 4002 yet so I'm not sure how the data is being written.  I am using the SW provided with the eval kit at the moment.

    Here are the settings and reg values:

  • 0
    •  Analog Employees 
    on Oct 21, 2021 4:18 PM in reply to RFman@arrow

    Were you able to compare HMC1031 vs ADF4002 with similar LBW filters? Also could you send your ADIsimPLL files for both the designs

  • Hi Alex,

    I do not think the HMC1031 is available to simulate in ADIsimPLL.  I am using it on an eval card set up for 10Hz LBW as per the data sheet.

    As for the ADF4002 the odd thing is the lower the LBW the worse the low end noise becomes as shown below:

    LBW = 1KHz

    LBW = 10Hz

    ADF4002_LoopBW10Hz.txt
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    The application would not upload a .PLL file so I changed to .TXT.  I hope you can simply rename and open in ADIsimPLL.

    Regards,

    Chris

Reply
  • Hi Alex,

    I do not think the HMC1031 is available to simulate in ADIsimPLL.  I am using it on an eval card set up for 10Hz LBW as per the data sheet.

    As for the ADF4002 the odd thing is the lower the LBW the worse the low end noise becomes as shown below:

    LBW = 1KHz

    LBW = 10Hz

    ADF4002_LoopBW10Hz.txt
    qZ;�PLLWBDocHdrX515W3e674d3137e4b55.40.04��qa
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    AnalogDevicesADF4002CrystekcustomT�@usercustom�cA�cA
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    The application would not upload a .PLL file so I changed to .TXT.  I hope you can simply rename and open in ADIsimPLL.

    Regards,

    Chris

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