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External 90º Hybrid for HMC525ALC4

Hi, I'm sorry if my question is too basic. I want to build FMCW radar with range 4-7GHz. Now I'm looking for the downconverter with the expected IF signal (LO-RF) is at 10-100 kHz. And I found HMC525ALC4.

But based on its datasheet, it mentions about external 90º Hybrid. Is it compulsory for me if I just need one IF port? What happen if I terminate one port with 50ohm dummy load and use another IF port directly without external 90º Hybrid?

Or, do you have any recommendation components either for the 90º Hybrid or the downconverter mixer?

Thanks,

Ghozali Hadi

Parents Reply
  • Hi,

    Using only one IF port without the hybrid would mean that you would have 3dB additional conversion loss. The hybrid is needed for image rejection. However you would lose the image rejection capability if using only one IF port.

    I think for your application these mixers would fit better:

    HMC1048A (only for downconversion)

    HMC129A.

    HMC218B,

    HMC219B,

    HMC557A,

    HMC787A,

    LTC5548,

    LTC5552.

    Thanks,

    Taz

Children on Apr 27, 2020 12:19 PM in reply to ghozalihadi
0

Hi,

Custom evaluation board should be requested through your local ADI sales office. However, you can purchase standard evaluation board online at:

https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/dc2461a.html#eb-documentation

Thank you.

  • Hi shsiao,

    Thanks for your reply. Actually I'm also considering replacing the balun manually using T1-6-KK81+ or TT1-6-KK81+ but I'm not sure about the matching impedance because both of them have different configurations with TC1-1-13M+. Do you know how to match impedance using T1-6-KK81+ or TT1-6-KK81+?

     

    Thanks,

    Ghozali Hadi