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Type: Posts; User: htforever

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  1. Replies
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    Closed: dc resistance of antenna

    How about antenna of GSM/CDMA radio base station? Zero or open? Which one is more common?

    Added after 24 minutes:

    I checked some technical notes about antenna of GSM macro radio base station,...
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    Closed: dc resistance of 50 ohm antenna

    Hi, all:

    As we know RF components (for example RF load/terminator) has high frequency impedance of 50Ohm (telecommunication), most of them also have DC resistance of 50 Ohm. Why and how do they...
  3. Closed: About AM-PM characteristic of LDMOS power amplifier.

    Hi, foxgan:
    Of course I know I can measure the AM-PM curve using network analyzer. But right now, it's not convenient for me to do that. So I want to ask for someone's experience.

    Thank you for...
  4. Closed: About AM-PM characteristic of LDMOS power amplifier.

    Has anyone measured the AM-PM characteristic of a LDMOS power amplifier?
    It's positive or negative?

    I studied some papers about predistortion. I found that some linearizers in some papers have...
  5. Closed: Please give me some advices about BS transceiver design.

    I will graduate this july, I find a job as a RF design Engineer, my job is to do Base Station RF transceiver R&D. I have two years experience on LNA and PA design and some knowledge on Repeater. But...
  6. Closed: How to save Spectrum analyzer measurement result?

    Thank you for your kindness.

    But can I transfer translate .sta file to .jpg file directly?
    I only have the .sta file.

    Thank you again.
  7. Closed: agilent spectrum analyzer *.sta file

    My Spectrum analyzer is Agilent ESA E4404B, I can save my measurement result as a .sta file.
    Can I translate it to .jpg file?
    What software do I need? My os is windows.
    thank you.
  8. Closed: What's the loss of SMA female to female convertor?

    This is a good method, I will have a try if I have enough sma adapters. :)
  9. Closed: What's the loss of SMA female to female convertor?

    But I can feel the effect of SMA adapter.
    If I add another SMA adapter, the measurement result will change a little.
  10. Closed: What's the loss of SMA female to female convertor?

    It's difficult for me make such measurement.
    I just want to get a typical value of noise temp or available loss of a sma adapter.

    I measured the NF of a 10dB attenuator, but there is a sma...
  11. Closed: What's the loss of SMA female to female convertor?

    Hi,marcomdd:
    yes, I am interested in noise temp of the SMA, It's not the SMA connector, but SMA female to female convertor.
    At 290K, what's its noise figure or noise temperature?
  12. Closed: What's the loss of SMA female to female convertor?

    Hi, sergio mariotti:
    I am interested in dissipative loss.
    I use common SMA female to female convertor,I mean it has no model and I don't know the producter. It has been used for a long time, more...
  13. Closed: Re: What's the loss of SMA female to female convertor?

    Thanks very much, I will take 0.15dB, :)
  14. Closed: What's the loss of SMA female to female convertor?

    Can anyone tell me the loss of SMA female to female convertor?
    0.1dB or 02.dB? which one is more suitable?
  15. Closed: Re: Questions about s-parameter simulation of LNA.

    Hi, radiohead:
    This is ATF-54143 reference design. Have you ever used this circuit to design LNA with ATF-54143?

    I have doubt about this circuit:
    Please check these two Application notes:
    High...
  16. Closed: Re: Questions about s-parameter simulation of LNA.

    The problem is that my simulation result is always quite different from the measurement result.
    This makes me very gloomy.
  17. Closed: Questions about s-parameter simulation of LNA.

    Hi, Mazz:
    I can understand your point of view.
    But some other people have different opinions. They think if you use accurate model of all components, take everything into consideration,
    the...
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    Closed: Questions about EM simulation of LNA.

    Hi, radiohead:
    Thanks very much for your reply.
    Now I have basic concept on EM simulation of LNA.
    Could you please share your design project file with
    me?
    If it's related to copyright, please...
  19. Closed: Questions about s-parameter simulation of LNA.

    Hi, flatulent:
    I use ADS to make the simulation.
    So I want to simulation everything that has accuracy model and has influence on the result.
    I want to have my design divinable.

    But I can't...
  20. Closed: 5988-2336en

    A LNA consist of a low noise transistor, input matching network, output matching network and bias network.

    So, when make small signal s-parameter simulation of LNA, Is't necessary to consider the...
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    Closed: Questions about EM simulation of LNA.

    Has anyone ever used ADS Momentum to simulate a LNA?
    Is that necessary?

    I have several questions to ask:
    1, how to describe the Low Noise transistor in Mom?
    I have only a S2P file to make...
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    Closed: Some questions about microstrip filter.

    Hi,mamali:
    Thank you very much for your design!
    I will consider it.
    Thanks for everyone's supporrt.
  23. Replies
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    Closed: Some questions about microstrip filter.

    Hi pva:
    I use ADS to make circuit and EM simulation.
    EM engine is Mom MW.
  24. Replies
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    3,911

    Closed: Some questions about microstrip filter.

    Hi pva:
    Your design is successful.
    Frequency shift of my LPF between EM simulation and circuit simulation is about 400MHz. Oh, my god, I can't even image the result of measurement.
    Pass...
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    Closed: Some questions about microstrip filter.

    Thank you, I will take your advice.
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