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Recent content by Hamid.Kiumarsi

  1. H

    How could I visualize metal coupling in die layouts from EM simulation (ADS)?

    Put ports on appropriate locations of your metals and check the resultant S parameters of your interest
  2. H

    Strange group delay at lower frequencies in Momentum

    It's a normal CPW line with a characteristic impedance of 50-ohm terminated on 50-ohm ports at both sides.
  3. H

    Strange group delay at lower frequencies in Momentum

    Hi, Say I have a simple CPW line and I want to see its group delay up to 40 GHz. I use Keysight's Momentum for my simulations. My understating is that group delay will be almost flat and eventually will increase past a certain high frequency (say 30 GHz). But to my surprise, I get an increased...
  4. H

    RF AMP design by using momentum simulation in ADS.

    Simulating a schematic with a connected S-parameter block (EM model in this case) to a nonlinear model of BJT should not be a problem. I did this kind os simulation about 4 years ago and as far as I remember everything was OK. Did you check the DC behavior of your EM model? does it handle DC...
  5. H

    RF AMP design by using momentum simulation in ADS.

    That's right; Momentum simulation is only for passive devices. You have to simulate your passive circuit in Momentum and then create a symbol (layout look alike is better to understand what you are doing) and choose EM model for it. The rest of simulation with added active and power supplies...
  6. H

    RF AMP design by using momentum simulation in ADS.

    Momentum simulation is for passive devices which in your case is for your matching circuit. Basically as long as you add your active device in step 3, there is no problem with steps mentioned above. Power amplifiers are highly nonlinear blocks; In addition to S-parameter simulation, consider...
  7. H

    Estimate inductor Q factor, for thin layer.

    Hi, Since your circuit is planar, you will get good results using Momentum. I got OK results for on-chip inductors some years ago.
  8. H

    High power combiners at microwave frequencies

    Bulky waveguide combiners can offer lower loss but they are not your only option; you can use microstrip-based combiners which can handle this power. I do remember that there was a very light MS-DOS software from Rogers which could give you an idea about power handling capabilities of...
  9. H

    quarter wave transformer

    I assume that you are going to match a 50-ohm transmission line to a 100-ohm load and not a 100-ohm transmission line. If so, then your 3D model in HFSS consists of a 50-ohm transmission line connected to a transformer. Port 1 will be at the edge of the 50-ohm TL and port 2 at the edge of the...
  10. H

    quarter wave transformer

    This is a very simple problem; the dielectric constant will affect the width of your transformer and basically you can have any Er that is available to you. You will have a port at each end of the transformer.
  11. H

    Why 50 Ohm Impedance Doesn't Really Matter At Low Frequency

    Scattering parameters which 50 ohm terminations are relevant to them are used in high frequencies where you cannot measure impedance or admittance parameters accurately due to the difficulty in broadband short and open tests. At low frequencies, where you can measure Z matrix of a network, there...
  12. H

    simulation using ADS sofrware

    Hi, I normally set my mesh frequency to the highest simulation frequency. Cells/wavelength depend on the accuracy that you want. Increase it and see the results. for lower frequencies and accuracy, set it to 20. Don't forget to enable "edge mesh". If your design is in millimeter-wave...
  13. H

    clone to and clone from commands in hfss

    metals will override dielectric objects. I don't have access to my HFSS now but I think objects with conductivity beyond a certain level will be treated as metals which should be the same case for pec.
  14. H

    [SOLVED] Full chip simulation in HFSS

    Hi, If you want to have a differential port, you have to set the impedance to 100 ohm. The thing is, by setting your differential port's impedance to 100 ohms, you will miss the common mode response. So, my suggestion is to have two single ports with impedance of 50 ohms (instead of one...
  15. H

    [SOLVED] ADS dual strip microstrip design viability

    Assume that you want your differential port between Pin1 and Pin2. In the simulation setup of Momentum, go to the ports tab. Probably you will have two ports each of which have its (+) terminal connected to Pin1 or Pin2 and its (-) terminal to the ground. Simply drag the Pin2 and drop it in the...

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