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Type: Posts; User: volker@muehlhaus

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  1. Closed: Re: Using ADS2019, How to set and measure tempature values for LNA?

    Yes, nonlinear model sounds correct. And use a variable for temperatur, so that you can change it easily for all components.

    For the ideal L and C elements in your design temperature will not...
  2. Closed: Re: Using ADS2019, How to set and measure tempature values for LNA?

    The most important component in your model - the transistor - is an S2P dataset at one fixed temperature. Your plan makes no sense if you only have that transistor data at that fixed temperature.
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    Closed: Re: problem with ADS license

    The only solution is to have an ADS license that includes Cadence Interoperability. You need to contact Keysight.
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    Closed: Re: problem with ADS license

    There are some designkits built to support Cadence Interoperatibility (for example IHP) and indeed that requires an extra license feature. PDKs without interoperability don't need that license...
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    [SOLVED]Closed: Re: Momentum cosimulation ADS

    Sure, that is possible.

    But make sure the difference is not from using too simple model (e.g. lossless metal or lossless dielectric) in Momentum simulation.
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    [SOLVED]Closed: Re: Momentum cosimulation ADS

    What is "better" ? They can be different, in any direction.
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    Closed: Re: How to design a DC block circuit

    As Klaus mentioned, just use a 100pF series capacitor.
  8. Closed: Re: Characteristic impedance of combination of CPWG and stripline on inner layers

    Yes exactly. By leaving out those vias, your various "ground" metals are unconnected and can be start to have unwanted potential here and there ... causing all sorts of resonance and strange...
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    Closed: Re: ADS co-simulation taking too long

    The taper width is reversed in your model:
    left is cell4 with w=5.2
    right is cell5 with w=10.5

    I looked at internal losses your matching circuit. To do so, I put them back to back and calculate...
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    Closed: Re: ADS co-simulation taking too long

    It can be physical if the taper is lossy. One way to check that is to look at |S11|2 + |S21|2 of the tapers. Result is between 1 (for lossless device) and 0 (completely lossy)

    Can you tell me a...
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    Closed: Re: ADS co-simulation taking too long

    The S2P file is missing.

    I don't think that random optimization with 4 variables is efficient for EM-based simulations. Have you tried to find a mathcing solution using circuit model taper first,...
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    Closed: Re: ADS co-simulation taking too long

    Ok, the cells scale properly.

    Similation method: Your random optimization approach looks inefficient to me.
    I didn't try the actual simulation because I don't have that demokit installed...
  13. Closed: Re: Light distribution from multi LED lamp?

    The difficulty with using 10 small COB to illuminate 10 different areas is this: depending on color tolerance of the individual COB, you will notice different color on your wall/target. Color...
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    Closed: Re: Which Antenna for VHF/UHF ?

    For wideband VHF/UHF, have a look at log periodic antenna.

    Google will also show you examples how log periodic is implemented on PCB, but obviously it will be large for this frequency range.
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    Closed: Re: Which Antenna for VHF/UHF ?

    Yes, and there is a reason why. Path antenna is narrowband by design.
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    Closed: Re: ADS co-simulation taking too long

    Having multiple entries in the emModel doesn't mean that the layout has actually changed. The ultimate test is what I wrote above: place two instances of your parameterized layout cell into another...
  17. [SOLVED]Closed: Re: need ways to access the isolation effects of GND vias in PCB layout

    You seem to misunderstand RF concepts. Coupling coefficient is a low frequency concept for inductors. The coupling of lines is more complex than that, it has both inductive and capacitive coupling. ...
  18. [SOLVED]Closed: Re: need ways to access the isolation effects of GND vias in PCB layout

    Yes, this is an easy task for EM simulation to calculate the coupling with via fence.
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    Closed: Re: Resonating the coil in HFSS

    You are missing the basics. Parallel LC is high impedance at resonance -> S11=0dB
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    Closed: Re: ADS co-simulation taking too long

    If you create a parameterized layout cell, there is one possible user mistake: By default, the cell layout is fixed ("Use this layout") and doesn't change. See my appnote on parameterized EM:...
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    Closed: Re: ADS co-simulation taking too long

    It doesn't seem that you checked what topology and parameter range can provide mathing, and instead just tried "something" with range "almost anything" as a brute force approach. Not so great. Have...
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    Closed: Re: Resonating the coil in HFSS

    S11 matching of the single coil is not use a useful parameter if you study wireless power transfer. We want to transfer the power to the pickup coil, with minimum losses in the driver coil.
    ...
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    Closed: Re: Resonating the coil in HFSS

    You are looking at the wrong value. If you compensate the R+jX of the inductor by a -jX of the capacitor, the resulting input impedance is the inductor series resistance. And we want that resistance...
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    Closed: Re: 23 dBi gain patch panel antenna

    But make sure to use a very low loss substrate. On standard FR4, you will never reach such gain because larger arrays then mean larger distribution networks, and the loss in the distribution network...
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    Closed: Re: Ferrite beads for EMC testing

    If your load is high impedance, you better combine the ferrite bead with a shunt capacitor, to form a low pass filter.
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