Because of terrain's blocking effect,some area cannot receive the synchronized FM radio signal.To solve this problem,especially in a tunnel,a new low power transmitter is applied which can send multichannel signal in different signal paths at the same time.Due to the intermodulation effect of multichannel,the transmitter needs high linearity.In this paper,a linear low power amplifier is designed.the output power is about 2.8W and its IM3 ≤-40 d Bc.
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