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HMC313 : Test data in the datasheet and Evaluation board

Hi,

Was the test data of HMC313 datasheet measured by HMC313 Eva board which is shown page 8 in the datasheet? If yes, were LCR parts used the table in the page 8 of the datasheet?

As the Eva. board of HMC313, the pad of J1 and J2 are larger than other Eva. board, e.g. HMC311ST89. Could you advise me the purpose of the large size pads?

And, should we need to do the matching on a PCB for using HMC313? I received some inquiries from our customer.

Best regards,

Akira

in case of Eva. HMC313 board;

in case of HMC311ST89 Eva. board

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  • Hi AkiraO,

    The heavy roll-off vs. frequency shown in the plot at right below is likely caused by the RF choke on the EVB.

    That choke is Coilcraft part # 0805CS-220XJLB, with S-parameters that can be found here: http://www.coilcraft.com/zip/0805cs.zip

    The S-parameters (plotted at left) show its SRF to occur at 3.5 GHz...the exact frequency at which the gain starts to roll-off on the plot at right.

    The following is noted below the Electrical Specifications table of the HMC313 data sheet:

    I looked back through our records and found that the HMC313 was indeed validated and characterized on a very generic SOT26 board (not the one shown on the data sheet) that did not have an on-board RF choke. Thus the use of the broadband bias tee.

    Considering that we were able to validate the part using such a generic PCB with an external broadband bias tee, I would bet that the part is not very prone to oscillation and thus the 22 nH value is not that important. On your own board you could perhaps use a choke of larger inductance in a smaller package, such as the one used on our HMC8410LP2FE EVB. We use that choke across the range of 0.01-10 GHz, though you could select differently based upon your frequencies of interest.

    FYI, we have an app note regarding selection of broadband biasing of amplifiers. It’s not the best, but it provides some basic conceptual instruction plus reference to some L & C manufacturers for component selection:

    http://www.analog.com/media/en/technical-documentation/application-notes/Broadband_Biasing_of_Amplifiers_v00p1112.pdf

    Regards,

    SMcBride

Reply
  • Hi AkiraO,

    The heavy roll-off vs. frequency shown in the plot at right below is likely caused by the RF choke on the EVB.

    That choke is Coilcraft part # 0805CS-220XJLB, with S-parameters that can be found here: http://www.coilcraft.com/zip/0805cs.zip

    The S-parameters (plotted at left) show its SRF to occur at 3.5 GHz...the exact frequency at which the gain starts to roll-off on the plot at right.

    The following is noted below the Electrical Specifications table of the HMC313 data sheet:

    I looked back through our records and found that the HMC313 was indeed validated and characterized on a very generic SOT26 board (not the one shown on the data sheet) that did not have an on-board RF choke. Thus the use of the broadband bias tee.

    Considering that we were able to validate the part using such a generic PCB with an external broadband bias tee, I would bet that the part is not very prone to oscillation and thus the 22 nH value is not that important. On your own board you could perhaps use a choke of larger inductance in a smaller package, such as the one used on our HMC8410LP2FE EVB. We use that choke across the range of 0.01-10 GHz, though you could select differently based upon your frequencies of interest.

    FYI, we have an app note regarding selection of broadband biasing of amplifiers. It’s not the best, but it provides some basic conceptual instruction plus reference to some L & C manufacturers for component selection:

    http://www.analog.com/media/en/technical-documentation/application-notes/Broadband_Biasing_of_Amplifiers_v00p1112.pdf

    Regards,

    SMcBride

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