Hi pragash,
Yes that is what I want to do.
Concerning the equations I found it in the literature. they work very well for lower frequencies which leads me to think that I need to add components to my schematic that are dependent only on frequency so I can have the resonances at higher frequency, but as far as I know when the frequency become higher it is difficult to model such a behavior. Any ideas on this matter?!
You are right. Every lumped component has SRF. For frequency well below SRF, inductor will be inductor and capacitor will be a capacitor. After SRF, the capacitor will become/behave as inductors and the inductor will behave as a capacitor. There will be huge variation in inductance (for inductor) and capacitance (for the capacitor) when its closest to SRF point. That's why its preferred to select lumped component with SRF way above operating frequency.
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for the components, I am using the ones from ADS library but they don't have / I could not found where to check the self resonance frequency (SRF).
thank you very much for your help I really appreciate it!
ADS components which you select from lumped component tap are ideal components meaning those component does not have SRF. ideal component will behave the same over infinite range of frequency. so your issue should be in the equation you inserted. it has nothing to do with SRF.