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24th August 2019, 04:15 #1
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Load pull simulation in ADS
Hi,
In ADS load pull simulation results. Is it correct that the impedance at marker 3 is the Zload (7.161+j 2.480) which are using in output matching design, and input impedance is the Zsource (16.97j 32.31) using in input matching network design? And also want to know is it one tone load pull is sufficient for design high efficiency RF power amplifier (i.e. no need to perform 2 tone load pull)?
I already attached my results from load pull simulation (One tone load pull with constant source power). Thanks in advanced

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24th August 2019, 13:27 #2
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Re: Load pull simulation in ADS
If you're interested in one single specification only ( max. Power or max. Efficiency) single tone simulation is enough but if you're also interested in Linearity, second carrier Load Pull Simulation is necessary because this will give you an insight about the harmonics that will appear at the output and obviously how to reduce their level.While you're reaching to max. Power Level, you may loose the Linearity and this compromise will tell you how to choose the Optimum Impedance.
If the model is sufficiently accurate and the simulation setup has been well established, the results of ADS are pretty good ..
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25th August 2019, 02:08 #3
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25th August 2019, 04:47 #4
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25th August 2019, 11:22 #5
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Re: Load pull simulation in ADS
Yes, if the Optimum Load Impedance is as shown there, the correspondingand has to be presented to input Input Impedance has been given by ADS.You have to walk around these impedances to get the satisfying result.
If this amplifier is unstable under 1GHz, it's a problem because its' harmonics will disturb the operating frequency band.There are many techniques to make any amplifier stable.
But first of all, you should check this unstability continues when the amplifier is terminated with mentioned impedances ?? The stability may chamge much with terminating impedances ( source and load ) therefore the stability must be checked first with those impedances.If the status is persist you can apply stabilization techniques to the amplifier.
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26th August 2019, 00:21 #6
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