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    Power Amplifier Design

    For load-pull simulation to extract optimum load impedance. How to set input power ? According to what?

    Thanks in advanced

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    Re: Power Amplifier Design

    Output Power should be vicinity of P1dB. In fact, there isn't any convention about that because some manufacturers use P3dB some of them P1dB.
    Nevertheless, P1dB Compression Point is chosen and Input Power is adjusted in according with that.Because Optimum Load will be used to achieve max. [specification]
    [specification]: max Pdelivered or max. Efficiency or max. Power Gain..


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    Re: Power Amplifier Design

    Quote Originally Posted by BigBoss View Post
    Output Power should be vicinity of P1dB. In fact, there isn't any convention about that because some manufacturers use P3dB some of them P1dB.
    Nevertheless, P1dB Compression Point is chosen and Input Power is adjusted in according with that.Because Optimum Load will be used to achieve max. [specification]
    [specification]: max Pdelivered or max. Efficiency or max. Power Gain..
    Thanks for the valuable information. Is the same thing is considered for doherty sub-amplifiers (main & auxiliary)? I want to do a correct DPA design, but still confusing about load pull setting such as input power level for each one of the sub-amplifiers



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    Re: Power Amplifier Design

    When you said Power Amplifier Design I thought it would drive an 8 ohms speaker.



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    Re: Power Amplifier Design

    Quote Originally Posted by Mabrok View Post
    Thanks for the valuable information. Is the same thing is considered for doherty sub-amplifiers (main & auxiliary)? I want to do a correct DPA design, but still confusing about load pull setting such as input power level for each one of the sub-amplifiers
    You should drive the PA until the PA enters into SAT mode in order to observe the Efficiency in Main and Aux. Amplifier regions. Back-Off effect in Efficiency can be observed with this method ..



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  6. #6
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    Re: Power Amplifier Design

    I do loadpull for the main amplifier at two points:
    1. Just before the peaking amplifier turns on and begins to significantly do "load modulation".
    2. When both the amplifiers are saturated.
    For the peaking amplifier, I do loadpull at the peak point where both the amplifiers are saturated.


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