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RF Average power calculation

SMRFdesigner

Hello friends,

May I ask if someone knows how to calculate the average power delivered to a load? I'm running a HB simulation and the equation that I would like to use is the 0.5*V*conj(I), which is the same thing we use in ADS. Unfortunately, in the calculator, we only have access to the transient, AC and DC voltages and currents. I would like to calculate the amount of power delivered to a load (not necessarily 50 ohms) as a load of a PA.

Thanks,

Soroush

  • Hi Soroush,

    Well, it's not true that in the calculator you only have access to transient, AC and DC voltages and currents. There's a section in the function panel called "SpectreRF Functions" which gives you various data access functions for RF quantities too. In general I'd suggest with an RF simulation that you start by using the Results->Direct Plot->Main Form to get the quantities you want, and use the "Add to outputs" to add that plot to the ADE outputs, and then you can open the expression in the calculator and adapt to suit your needs.

    I would also suggest looking at the workshop in the SPECTRE release (in all releases up to SPECTRE17.1 and also in early SPECTRE18.1) <SPECTREinstDir>/tools/spectre/examples/SpectreRF_workshop/rfworkshop.tar.Z . It's been removed for some reason in later SPECTRE18.1 hot fixes and replaced with spectrerf_workshop_18.1.tar.gz but this doesn't cover everything the old workshop did. There was a document on PAs in the old workshop which showed how to make various measurements for PAs (as well as LNAs, oscillators, and Mixers in other documents). I'm checking to find out why it's been removed and if there's a plan to update it.

    You can also look at SpectreRF AppNotes and Tutorials - One of Our Best Kept Secrets!

    Regards,

    Andrew.

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