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[SOLVED] Small signal gain (S21) of Peaking stage of doherty power amplifier

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Mabrok

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For peaking stage doherty power amplifier (class-C biasing), when I simulate it separately using ADS I got small signal gain (S21 = -10 dB). Is that correct?

Thanks in advanced
 

Normal..Because C-Class Amplifier is biased lower than Vbe treshold so Ic=0 then Gain=-.. dB.
In order to check the Power Gain of an C-Class Amplifier, Large Signal condition should be used. I mean, you have to drive sufficiently the Amplifier then observe the Load Current and Voltage.
You can later calculate the Power Gain.
 
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    Mabrok

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BigBoss said:
Normal..Because C-Class Amplifier is biased lower than Vbe treshold so Ic=0 then Gain=-.. dB.
In order to check the Power Gain of an C-Class Amplifier, Large Signal condition should be used. I mean, you have to drive sufficiently the Amplifier then observe the Load Current and Voltage.
You can later calculate the Power Gain.
Click to expand...

Thank you, it is really helped me
 

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