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Adaptive ISO-Gain pre-distortion for an RF power amplifier operating in envelope tracking
Adaptive ISO-Gain pre-distortion for an RF power amplifier operating in envelope tracking
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机译:包络跟踪中运行的射频功率放大器的自适应ISO增益预失真
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摘要
The output of a Radio Frequency (RF) Power Amplifier (PA) is sampled and down-converted, and the amplitude envelope of the baseband feedback signal is extracted. This is compared to the envelope of a transmission signal, and the envelope tracking modulation of the RF PA supply voltage VCC is adaptively pre-distorted to achieve a constant ISO-Gain (and phase) in the RF PA. In particular, a nonlinear function is interpolated from a finite number gain values calculated from the feedback and transmission signals. This nonlinear function is then used to pre-distort the transmission signal envelope, resulting in a constant gain at the RF PA over a wide range of supply voltage VCC values. Since the gains are calculated from a feedback signal, the pre-distortion may be recalculated at event triggers, such as an RF frequency change. Furthermore, the method improves nonlinearity in the entire transmitter chain, not just the RF PA.
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机译:对射频(RF)功率放大器(PA)的输出进行采样和下变频,并提取基带反馈信号的幅度包络。将其与传输信号的包络进行比较,对RF PA电源电压V CC Sub>的包络跟踪调制进行自适应预失真,以在RF中获得恒定的ISO增益(和相位)。 PA特别地,根据从反馈信号和传输信号计算出的有限数量的增益值来内插非线性函数。然后使用该非线性函数对传输信号包络进行预失真,从而在很宽的电源电压V CC Sub>值范围内在RF PA处获得恒定增益。由于增益是根据反馈信号计算的,因此可以在事件触发(例如RF频率变化)处重新计算预失真。此外,该方法改善了整个发射器链的非线性,而不仅仅是RF PA。
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