why we use PA,not other type amplifier?

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John_li

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Hi friends,
As we know, Ga,Gp,Gt are the gain of power.Then if we want to design two stages PA,normal use driving amplifier+PA,not 2 stages of driving amplifier.My qustion: if the input level is 0 dBm,design>24dBm output level
Why use driving amplifier(16dB)+PA(8dB),total is 24dB gain?Not use two stages of driving amplifier(12dB/stage)-----also gain 24dB?
Thanks,
 

Power amplifiers can only supply the wanted power with certain nonlinearity.Linear amplifiers will enter into saturation at high power levels..
 

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    John_li

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Thanks for BigBoss'reply.You mean output level of driver amplifier will make the next amplifier saturation,and PA work in nolinearity.And if i want to design a total 18dBm output level,wehther i can design as: the first stage power gain =2dB,and the second stage power gain=16dBlet them all in linearity?
 

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