question about gain expansion of PA

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gain expansion

hi everybody
I'm designing PA for 802.11b,but i find it has the problem of gain expansion, as a
result, the 1dB point is lager the normal value, in other words, the linearity is bad,
how can i solve it? thanks
 

Normally, gain expansion generated by Vgs modulation. Maybe you can increase the Idq to a real class A PA to see what will happen.
 

shunt a cap in bias circuit will be better to gain expansion
 

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