Frequency Response Heterojunction Bipolar Transistor

Discussion in 'Homework Help' started by insyspower, May 29, 2017.

  1. insyspower

    Thread Starter Member

    May 29, 2017
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    I have a project, first i need to find a circuit to analyse/study the Frequency Response of Heterojunction Bipolar Transistor. Then simulate that circuit on SPICE (i'am using Orcad Cadence).
     
  2. dl324

    AAC Fanatic!

    Mar 30, 2015
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    Welcome to AAC!

    This sounds like homework. If it's homework, you need to post your best efforts first. Then members will try to guide you to a solution.
     
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  3. insyspower

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    May 29, 2017
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    The fT (Transition frequency) of a transistor (the ones i'm studying) ranges from 10 GHz to 100 GHz (High Frequency).
    The Beta should be around β=200 (Hfe).

    Can someone help me finding a circuit as mentioned above???, I'm having difficulties finding one. Any links, etc, would be very helpful, just need some circuit to start with.

    How to add Microstrip transmission lines to Orcad Cadence? do i need the PCB version of it or just the regular version?
     
  4. insyspower

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    May 29, 2017
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    I still have the same questions. (post #1 & #2)
    Anyone can help?
     
  5. bertus

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  6. insyspower

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    May 29, 2017
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    I google it many pages couldn't find anything useful.
    Looking for a HBT circuit and the model to use on Orcad/SPICE.
     
  7. bertus

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  8. insyspower

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    May 29, 2017
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    Anyone?
     
  9. bertus

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  10. Bordodynov

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    May 20, 2015
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    This is certainly not ORCAD.
    LTspice
    Draft482.png
     
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  11. insyspower

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    May 29, 2017
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    Ok, thanks that helps.
    Where did you find the model BPF620F and that .txt file?
     
  12. Bordodynov

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  13. insyspower

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    May 29, 2017
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    I'am trying to simulate exactly what you did, i can't get the 3 lines (RGB)
    {ie} is a label or something?, it doesn't let me put the "{ }".
    Also, my .txt file is a bit different than yours.
     
  14. Bordodynov

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    May 20, 2015
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    See
    BFP620F.png
     
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  15. insyspower

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    May 29, 2017
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    Thanks again!
     
  16. Bordodynov

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    I used the revised model. You asked for a link, which I did. All models have two emitters. It's easy to fix this, but it's easier to use a four-pin symbol.
    Manipulating the left and right mouse button you can access all transistors in the library. This is such a feature (not documented) LTspice
     
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  17. insyspower

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    May 29, 2017
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  18. Bordodynov

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    See
    Gain1.png
     
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  19. insyspower

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    May 29, 2017
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    Yeah is 5V not 15V, now VBE is 0.7V.
    Ic/Ib ranges from 340 (10Hz) to 0 (1GHz+).
    But in datasheet ranges from 110 (min) to 270 (máx), something wrong?
    is Emiter 1 and Emiter 2 well connected to the rest of that circuit?
    The diagrams (Gain, FT, Hfe) in datasheet seem a bit off.
     
    Last edited: Jun 20, 2017
  20. Bordodynov

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    May 20, 2015
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    See Beta=F(ie)
    BETA.png
     
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