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Design of linear Doherty power amplifier for handset application

机译:手机线性Doherty功率放大器的设计

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The ideal Doherty power amplifier (PA) can be linear because the uneven powers from the carrier and peaking amplifiers are combined perfectly, providing the flat AM-AM characteristic. But transistor responses are different for the class AB and C biases and the nonlinear responses should be corrected to get the linear response. The nature choice for linearization of the Doherty PA is to compensate the gain compression of the carrier amplifier and the gain expansion of the peaking amplifier. For the purpose the peaking amplifier should be turned on early and the third-order intermodulation (IM3) of the two amplifiers should be adjusted properly. Proper harmonic load conditions can further improve the linearity. The detailed design process will be introduced.
机译:理想的Doherty功率放大器(PA)可以是线性的,因为来自载波和峰值放大器的不均匀功率可以完美地结合在一起,从而提供平坦的AM-AM特性。但是,对于AB类和C类偏置,晶体管响应是不同的,应校正非线性响应以获得线性响应。 Doherty PA线性化的自然选择是补偿载波放大器的增益压缩和峰值放大器的增益扩展。为此,应尽早打开峰值放大器,并适当调整两个放大器的三阶互调(IM3)。适当的谐波负载条件可以进一步改善线性度。详细的设计过程将被介绍。

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