• Peak power in an LNA
    Richard
    Thanks for the thoughts! I should have mentioned this, I was thinking of a GaAs pHEMT LNA design.
    Steve
  • June's newsletter examples using scikit-rf
    Julien

    This is great! I will add it to the page as an alternative way to interpolate. SciKit RF is awesome, I'm still waiting for Alex to print up some new shirts. Blam!

    Steve
  • Peak power in an LNA
    That makes sense! How about if you test some samples at peak power slightly about the requirement, left them on a hot plate, and saw no measurable change in S-parameters or DC current? Would that be a convincing argument?

    Thanks
  • Anyone working in the 50 - 70 GHz range?
    Norman
    We will forward your interest to the owner of this equipment and get back to you by email. Thanks for your participation in our discussion board!

    Steve
  • Passive tripler
    Thanks! I found someone that lent me the book so I am all set!
    Steve
  • Plating on 3D printed ABS resins?
    That will be a useful paper to many people, thanks!

    Steve
  • Balun combined amplifiers
    Richard

    Yes that is what I was referring to. Thanks!
  • Passive tripler
    Thank you Mr. Matt! I found someone with a copy of it I was able to borrow. Hoping to learn some multiplier magic!
  • Passive tripler
    Partially answering own question.... Faber, Chramiec and Adamski, Microwave and Milliieter Wave Diode Frequency Multipliers....

    https://www.amazon.com/Microwave-Millimeter-Wave-Frequency-Multipliers-Hardcover/dp/0890066116

    out of print and out of stock.
  • Harmonics in solid-state switches
    Thanks! Later this year I will try to do some measurements on PIN diode switches on a spec an... If this Covid thing dies down...
  • Group delay in a receiver
    Out mixer spreadsheet has been updated to fix the high-side group delay issue, grab a copy here.

    https://www.microwaves101.com/download-area#SparMixer
  • Wilkinson resistor test
    Totally agree. Combine a good process and good people and there is nothing to worry about. This was more of a thought experiment gone awry! Thanks Desert Sage.

    I did not consider TDR, thanks madengr!
  • Identify this uW tube
    Note to readers... you need to log in to see the photo!

    Steve
  • Wilkinson resistor test
    and yes, madengr... no access to the ports....
  • Wilkinson resistor test
    That seems like a very good idea! My concern is for a combiner where they are assembled with eentsie chip resistors, thinking that the solder process could short them out or leave them open...
  • Reactive combiner in an SSPA?
    I think I can answer my own question... the amplifiers should see a good match with a reactive combiner. This is apparent when the amplifier is analyzed in even mode where both ports are excited equally.
  • Group delay in a receiver
    It turns out that when you "mix" S-parameters with high-side LO, you need to take the conjugate of S21 and S12, and then group delay comes out as expected. I did not make this up, it is detailed in a paper by Dr. Dylan Williams...I'll post some updates on this shortly....

    Thanks to Frauke for pointing this out. Here is the reference:

    D. F. Williams, F. Ndagijimana, K. A. Remley, J. A. Dunsmore and S. Hubert, "Scattering-parameter models and representations for microwave mixers," in IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 1, pp. 314-321, Jan. 2005,
  • Plating on 3D printed ABS resins?
    I know that plating plastic is possible, and some companies do it well. But the devil is in the details. Not just in the plating but in holding tolerances on the plastic part. I am considering adding an entry on this on our career killer page... good luck!

    Steve
  • switch diode question
    You might try Microsemi

    https://www.microsemi.com/product-directory/rf-microwave-a-millimeter-wave/3592-rf-discretes

    Their web site states:

    "Microsemi also can offer a significant number of existing configurations to minimize your NRE and provides many customers with microwave components no longer available from their original suppliers. Microsemi's extensive library of products and designs gives us the ability to respond quickly with solutions to meet your needs, quickly and cost effectively."

    Good luck!
    Steve

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