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  1. #1
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    Source-Pull and Load-Pull Simulations in ADS

    Hi everyone, here is my problem!

    I have the ADS model of a transistor. In the datasheet of this transistor, the Zs and Zl for five different frequencies are given and stated that these values are optimized for power, gain, PAE and Psat. So I have been trying to find these exact values of source impedances and load impedances, given in the datasheet, at all these different frequencies by ADS load-pull and source-pull simulations, so that I can be sure and find the Zs and Zl for other frequencies not given in the datasheet. My plan was to find the values for these following different conditions:

    1. maximum output power
    2. maximum gain
    3. maximum PAE
    4. maximum Psat

    One of my attempts:

    I understand that

    Gain_dBm = Pout_dBm - Pin_dBm

    So to find the optimum load impedance for maximum gain, I chose HB 1 tone load-pull from ADS design guide and replaced the transistor with mine. I also set the proper bias condition and frequency for which the gain is mentioned in the datasheet. Later I put Pavs = 0 dBm (according to ADS, this is not the Pin). However, I assumed that in this case the value of maximum power delivered should the value of maximum gain. But I don't get anything thing close to the values given in the datasheet.

    I am absolutely new to ADS. So I really don't know what are the initial condition or setup in ADS to find the Zs and Zl for maximum output power and so on.

    I would really appreciate any kind of suggestion or if you just share your experience. I look forward to your replies. Thanks in advance.
    Last edited by rashed1880; 4th September 2012 at 18:38.

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  2. #2
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    Re: Source-Pull and Load-Pull Simulations in ADS

    ADS has an example for amplifier load-pull. Why not ref that?


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  3. #3
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    Re: Source-Pull and Load-Pull Simulations in ADS

    Quote Originally Posted by tony_lth View Post
    ADS has an example for amplifier load-pull. Why not ref that?
    i tried, but i can't manage to get the exact values of Zs and Zl given in the datasheet. that's why i was wondering if there are certain ways to get the Zs and Zl for max PAE or max output power.



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