HMC8410 and inductor

I have a question about HMC8410.
Coilcraft 's 590nH inductor is used for the bias, but my customers say that this is not available.
I must show customers how to choose an alternative inductor.

I think L1 and L2 are choke coils.
What is the performance required for the inductor besides being low in DC resistance and conforming to the GHz band?
Why was the inductor selected from the E48 series?
Is there a reason to be precise?

Best regards

 

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  • 0
    •  Analog Employees 
    on Oct 11, 2017 5:50 PM

    Hi Mochi,

    The Coilcraft website shows those EVB L1 and L2 part # 0402DF-591XJRU inductors as being in stock, with at least 57,000 available, though it did not ask for location (U.S.A., etc.). Regardless, if your customer can't obtain those inductors then it will be important for them to understand why we selected them. We selected them to function as RF chokes, allowing DC to pass while impeding the RF. These particular inductors were selected for a number of reasons: Small footprint, low DC resistance, and an overall response vs. frequency that would provide the HMC8410LP2FE with acceptable trade-offs in performance across the entire operating frequency range. The designer told me that 590 nH was chosen to help roll-off the gain below 10 MHz so that the application circuit remains stable. For that reason, if a different choke is selected then, it should be of somewhat similar value.

    Regards,

    SMcBride

Reply
  • 0
    •  Analog Employees 
    on Oct 11, 2017 5:50 PM

    Hi Mochi,

    The Coilcraft website shows those EVB L1 and L2 part # 0402DF-591XJRU inductors as being in stock, with at least 57,000 available, though it did not ask for location (U.S.A., etc.). Regardless, if your customer can't obtain those inductors then it will be important for them to understand why we selected them. We selected them to function as RF chokes, allowing DC to pass while impeding the RF. These particular inductors were selected for a number of reasons: Small footprint, low DC resistance, and an overall response vs. frequency that would provide the HMC8410LP2FE with acceptable trade-offs in performance across the entire operating frequency range. The designer told me that 590 nH was chosen to help roll-off the gain below 10 MHz so that the application circuit remains stable. For that reason, if a different choke is selected then, it should be of somewhat similar value.

    Regards,

    SMcBride

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