The present invention relates to a power amplifier , the first common source transistor ; A second common source transistor coupled to fulfill the first transistor and the common source inverter structure ; And the first transistor and the common source is connected to the cascode structure , the second transistor and the common source comprises a common gate transistor connected in parallel , to improve the breakdown characteristics , improving the output gain , and is easy to implement and to withstand the high peak voltage .
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