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Type: Posts; User: volker@muehlhaus

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  1. Closed: Re: Using a 0db Attn as termination

    From your datasheet, that is a series of SMD attentuators. Different values including 0 dB can be used for post-layout level adjustment.

    The attenuator will improve matching by 2*A dB, where A is...
  2. Closed: Re: Using a 0db Attn as termination

    What do you mean by 0dB attenuator? In your drawing, is that "0dB" device a ferrite isolator or why does it provide isolation?
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    Closed: Re: Broken RF ground plane

    Sounds reasonable, just connect top and bottom near the gap. Another option would be to place a capacitor with suitable SRF across the slot, or a 0R resistor, so that RF can pass.
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    Closed: Re: Dipole antenna input

    Yes, but that's not "clean" and if you have some length of line between the antenna, it will be part of the radiating structure and sensitive to the environment. In one my projects, I tried that but...
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    Closed: Re: Dipole antenna input

    Use a 1:1 balun from coax to symmetric (differential).
  6. Closed: Re: Response of the TLINE for different frequencies and lengths

    Don't feed the troll.

    - - - Updated - - -



    No, the frequency + phase delay in TLINE is only another way to specify the line length. So this should be constant during your frequency sweep.
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    Closed: Re: cadence to ADS EM simulation

    Do you work in EDA museum? We discussed VPCD end-of-life ten years ago.
  8. [SOLVED]Closed: Re: Drawing simple Data in Smith ADS smith Chart

    Surely learn difference between RF fundamentals and software implementation. The Smith chart is all about that background impedance grid - without that, it's just a polar plot of reflection factor.
  9. [SOLVED]Closed: Re: Drawing simple Data in Smith ADS smith Chart

    Do you understand normalized impedance? When Smith chart is teached at universities, you learn about the normalized impedance/admittance grid on the chart. There is no need for "marker calculation",...
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    Closed: Re: Antenna efficiency from S11

    You can't do that.

    From S11 data, you can't tell anything about radiated power vs. power loss in the antenna.
    If you have s11=0, this can be a perfect antenna or a 50 Ohm resistor, you can't...
  11. [SOLVED]Closed: Re: Drawing simple Data in Smith ADS smith Chart

    Sweetheart, calm down. Every RF engineer can read normalized impedance from Smith Chart.
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    Closed: Re: cadence to ADS EM simulation

    EM simulation in ADS (Momentum) is based on the layout, not based on other simulation results (S-parameters).
  13. [SOLVED]Closed: Re: Drawing simple Data in Smith ADS smith Chart

    Yes



    You already have reflection factor and that is what ADS is drawing. The reference impedance information is not required for drawing. But yes, it is required to interpret the Smith chart if...
  14. Closed: Re: CPW based superconducting resonator using CST

    Good luck then. It's all about dense meshing and numerical precision.
  15. Closed: Re: CPW based superconducting resonator using CST

    If you think about the simulation method, high Q resonance and time domain solver is not a good combination.

    The users that I know use Sonnet for accurate calculation of their superconducting...
  16. Closed: Re: Transmission Line vs Lumped Inductor Choice in Distributed power Amplifier Design

    You will need more line length = more chip area, resulting in higher cost.
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    Closed: Re: RF PCB design in altium

    I know ... used this number to indicate that it's really no issue here. The usual estimate for line effects (include or ignore) is lambda/10, calculated using the effective wavelength in that...
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    Closed: Re: RF PCB design in altium

    Slots in the ground will cause return current to flow a much longer path, that's bad. You can solve this by placing a suitable capacitor (1nF or so) across the slot, so that RF current can flow on...
  19. Closed: Re: Surface roughness modeling issues

    John Coonrod (Rogers) and James Rautio (Sonnet) have done quite some work on this, for example...
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    Closed: Re: RF PCB design in altium

    Line width matters if the lines have a relevant length compared to the wavelength. At 80MHz, where your routing length is most likely < 1/20 wavelength, there is no need for controlled line...
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    [SOLVED]Closed: Re: Sonnet Installation in CentOS 7

    Indeed some output looks strange ... I wonder if this is a legal copy or some download of a "special" version.
    For a regular version with valid support contract, Sonnet support can help to resolve...
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    [SOLVED]Closed: Re: Sonnet Installation in CentOS 7

    No, this goes to the users startup file where your OS sets your environment.

    I'm not a CentOS user, but maybe this gives soem idea where to configure this stuff (what file to edit):...
  23. Closed: Re: Confused - transmission line component in Virtuoso and ADS

    You're a genius. That is how ADS is designed: it uses different line models for electrical and physical parameters: TLIN and TLINP.
  24. Closed: Re: Confused - transmission line component in Virtuoso and ADS

    circuitking mentioned ADS TLIN model, which of course has electrical length parameter

    153451
  25. Closed: Re: Confused - transmission line component in Virtuoso and ADS

    It's based on users needs. ADS users are usually RF designers, so they don't think in terms of delay time. That's why ADS ideal line models are based on phase delay at a given frequency.
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