Improving Power Amplifier Efficiency and、、、、、

Abstract—This paper presents a tunable matching network that .FXn=4l'vV  
enhances both efficiency and linearity of power amplifiers (PAs). 14v,z;HXj  
A medium-power amplifier with a varactor-based matching network WH^rM`9  
is designed, fabricated, and tested. It is demonstrated that bfjtNF
*^  
not only the power efficiency at reduced drive levels can be improved GT"gB$Mh  
but also the AM–AMand AM–PM distortions of the PA are *b0f)y3RV  
reduced when the tunable matching network is biased according .)eX(2j\
 
to the input drive level. Moreover, under 3GPP WCDMA modulated Hh1OD?N)  
input, the PAwith a dynamically controlled tunable matching <+c6CM$#}V  
network achieves up to 5% improvement in drain e .. .AgD`wba  
6-@n$5W0  

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呵呵！！！看看啊！！！！！！

呵呵！！！看看啊！！！！！！

have a look

thank you very much