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Type: Posts; User: promach

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  1. Closed: Re: Balun design gives box resonance error in Sonnet

    Something else is not right.

    I have attached the Sonnet design file at the end of this post

    https://i.imgur.com/tW4I1hh.png

    https://i.imgur.com/f1upN7t.png
  2. Replies
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    1,202

    Closed: Re: LNA circuit not working

    Are you implying that I should not include any load matching resistor RL at all for all type of circuit spice analysis (.tran, .ac and .noise) ?
  3. Closed: Re: Balun design gives box resonance error in Sonnet

    See page 4 of the paper

    https://i.imgur.com/qDZFCfJ.png
  4. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    I have imported and simulated the same layout in Sonnet

    How do I unwrap the phase difference (S12-S13) such that it does not jump from +180 degree to -180 degree ?
    ...
  5. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    I managed to make the balun more matched in terms of phase difference for S12 and S13

    Note: I have attached a zip containing the dxf file as well as the Ansys Neural File.
    ...
  6. Closed: Re: Balun design gives box resonance error in Sonnet

    Wait, why just the feed structure for this box mode test ?




    I am not sure. I need to email the original authors of the paper regarding this. I will get back to this post once they reply.
    ...
  7. Closed: Re: Balun design gives box resonance error in Sonnet

    I downloaded your zip file but I still find that box resonance errors are still not suppressed as you had stated in post #7

    Did I miss anything ?

    https://i.imgur.com/2XFed11.png
  8. Closed: Re: Balun design gives box resonance error in Sonnet

    Free space as in vacuum ? then this will only work well within simulation.

    I already tried to increase the Air layer height to 40mm , but I just got more box resonance errors.
  9. Closed: Re: Microstrip High- and Low-Impedance Short-Line Sections

    There is a typo mistake for ABCD matrix for π-circuit network at Figure 4.7(b)

    Please see the correction below:

    https://i.imgur.com/IrNmN5r.png


    Ok, now to more detailed part:

    How to...
  10. Closed: Re: Balun design gives box resonance error in Sonnet

    I have already tried modifying the box size, but it does not really help.

    https://i.imgur.com/BHWrq62.png
  11. Closed: Re: Balun design gives box resonance error in Sonnet

    Well, this is not planar marchand balun. This balun topology does not require vias connections to ground.

    By the way, you can just run the Multi-Section_Coupled_Line_Balun.son design file using...
  12. Closed: Balun design gives box resonance error in Sonnet

    Why does this balun design (A 0.8–8 GHz Multi-Section Coupled Line Balun) give box resonance error in Sonnet ?

    Note: Just rename the attached Multi-Section_Coupled_Line_Balun.txt to...
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    Closed: Re: LNA circuit not working

    @frankrose

    Any comment on the .noise analysis simulation result below ?

    https://i.imgur.com/4qKee2h.png
  14. Closed: Why Z and Y matrices must be pure imaginary for reciprocal lossless N-port junction ?

    For a reciprocal lossless N -port junction,

    1) Why is Pavg = 0.5*[V] t [ I ] * instead of Pavg = 0.5*[V] * [ I ] t or Pavg = 0.5*[ I ] t [V] * ?

    2) Why [V] = [Z][ I ] instead of [V] = [ I...
  15. Closed: Re: Microstrip High- and Low-Impedance Short-Line Sections

    The following is the derivation process for expression 4.50

    ABCD matrix for transmission line at Figure 4.7(a)

    https://i.imgur.com/6FXNyjF.png

    ABCD matrix for π-circuit network at Figure...
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    Closed: Re: LNA circuit not working

    I have put everything under https://github.com/promach/LNA

    Any advices or comments on the TODO list within the github README ?
  17. Replies
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    128

    Closed: HF Upconverter Circuit Question

    What are the purposes of {L5, R5} , {C10, C11} , {R2, R4} in this HF upconverter circuit ?

    https://i.stack.imgur.com/QQCSw.png
  18. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    I have made both the coupled lines matching length and width. However, I am still not getting 180 degrees phase response.

    Why ?

    I have attached the dxf file as zip at the end of this post
    ...
  19. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    Yes, you are right.

    See New Design Formulas for Impedance-Transforming 3-dB Marchand Baluns

    I presume that we need to include both source impedance (Rr) and load impedance (RL) in EM layout...
  20. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    Alright. I will redo the layout. To be frank, that 135 degree turn is to allow space for isolation circuit between port 2 and port 3. Please advise.

    Besides, how does the length of the coupled...
  21. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    Why does the balun phase deviates away from 90 degrees and -90 degrees as HFSS sweeps up the frequency ?

    Can we do anything to the balun layout in order to make this issue less serious ?

    The...
  22. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    How is this related mathematically to Zin=Z0* [ ZL+j*Z0*tan(theta)] / [ Z0+j*ZL*tan(theta)] ?
  23. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    Zin=Z0* [ ZL+j*Z0*tan(theta)] / [ Z0+j*ZL*tan(theta)]

    Someone told me to use the above expression to understand why balun needs via. Any advices ?

    Besides, why arg(S_21) - arg(S_31)...
  24. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    Let me investigate more about the ground layer.

    https://i.imgur.com/2XxJ5gz.png

    - - - Updated - - -

    Ok, I have made the balun works.

    The real reason is due to the via connectivity to the...
  25. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    See the layer stackup at post #44
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