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Load pull methodology to characterise class-E outphasing power amplifiers

机译:负载牵引方法可表征E类超相功率放大器

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摘要

A novel load pull methodology to characterise the performance of class-E outphasing power amplifiers is presented. The traditional analysis of the outphasing topology cannot be applied when class-E amplifiers are used because these amplifiers do not behave as an ideal current or voltage source. Unlike most other amplifier classes, class-E amplifiers require a phase-modulated input signal with constant amplitude. Additionally, class-E amplifiers have non-linear transfer characteristics which are a function of the load impedance. The methodology presented here is based on finding the load locus in the load pull plane of an individual class-E amplifier. Then the performance of the two class-E amplifiers in the outphasing topology is readily obtained. The key advantage of the method is that the load pull characterisation of only a single amplifier is required. The methodology is general in that any passive load combining circuit can be used and any amplifier combination can be used in the outphasing topology provided that their load pull data are available. The load locus is derived without any reference to the phase difference between the drive signals.
机译:提出了一种新颖的负载拉动方法,以表征E类超相功率放大器的性能。使用E类放大器时,无法应用对移相拓扑的传统分析,因为这些放大器不能充当理想的电流或电压源。与大多数其他放大器类不同,E类放大器需要具有恒定幅度的调相输入信号。此外,E类放大器具有非线性传输特性,该特性是负载阻抗的函数。此处介绍的方法基于查找单个E类放大器的负载牵引平面中的负载轨迹。然后,很容易获得两个E类放大器在异相拓扑中的性能。该方法的主要优点是仅需要单个放大器的负载牵引特性。该方法是通用的,只要可以使用它们的负载拉动数据,就可以在无相拓扑中使用任何无源负载组合电路,并且可以使用任何放大器组合。在不参考驱动信号之间的相位差的情况下得出负载轨迹。

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