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What is "backed off efficiency" for PA ?

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chihhao

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paback-offefficiency

Where can I find document with illustration ?
Thanks a lot.
 

pa backed off

Probably the PAE when the output power is 1 dB to 3 dB lower than P1dB. This really only applies to class AB. The efficiency gets worse as drive is backed off since the transistor is biased at a quiescant point.
 

This figure shows that the efficiency of class A, AB, and B amplifiers falls off rapidly as back off increases.
 

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