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An envelope tracking RF power amplifier with capacitive charge pump modulator

机译:带有电容电荷泵调制器的包络跟踪射频功率放大器

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摘要

An envelope tracking (ET) radio frequency (RF) power amplifier (PA) is described intended for handsets and applications where a large number of PAs are needed. Instead of the usual split frequency architecture, a linear tracking charge pump structure is proposed. This allows the supply voltage of an RF PA to increase during the peaks of a high peak-to-average power ratio signal. When combined with an LDMOS RF PA, 42.9% efficiency was achieved at 31.3 dBm output power (POUT) when amplifying a 5 MHz bandwidth 8 dB PAPR 3rd Generation Partnership Project (3GPP) long term evolution signal. The first channel adjacent power ratio (ACPR) without digital pre-distortion was -30.4 dBc, meeting the 3GPP handset emission mask. The ACPR could be improved to -32.5 dBc by adopting a curved envelope shaping function at a reduced efficiency of 38.9%.
机译:描述了一种包络跟踪(ET)射频(RF)功率放大器(PA),旨在用于需要大量PA的手机和应用。代替通常的分频架构,提出了线性跟踪电荷泵结构。这允许RF PA的电源电压在高峰均功率比信号的峰值期间增加。当与LDMOS RF PA结合使用时,当放大5 MHz带宽8 dB PAPR第三代合作伙伴计划(3GPP)长期演进信号时,在31.3 dBm输出功率(POUT)处可获得42.9%的效率。没有数字预失真的第一通道相邻功率比(ACPR)为-30.4 dBc,满足3GPP手机发射掩模。通过采用弯曲包络整形功能,可以将ACPR提高到-32.5 dBc,降低的效率为38.9%。

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