2.8 A Class-G voltage-mode Doherty power amplifier

2017 IEEE International Solid-State Circuits Conference (ISSCC) Pub Date : 2017-02-01 DOI:10.1109/ISSCC.2017.7870253

Voravit Vorapipat, Cooper S. Levy, P. Asbeck

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引用次数: 9

Abstract

In modern communication, wideband and high-spectral-efficiency modulation results in high peak-to-average power ratio (PAPR), up to 8 to 10dB. Well-known PA-efficiency-enhancement techniques, such as Doherty and outphasing, offer reduced efficiency improvement beyond 6dB back-off, limiting the efficiency enhancement obtainable with high PAPR modulation. Recent works have shown that a combination of different techniques [1–3] can result in improved efficiency well beyond 6dB back-off. However, these combined techniques have come at a cost of glitches due to mode-transitions, when power supply voltage or load impedance undergo large variations at critical power levels. In [1,2] switching between power supply voltages causes significant glitches, which degrade the EVM and ACPR of the transmitted signal. In [1], reasonable EVM is achieved, by reducing the average output power so that power supply switching is less frequent. A “skipping window” technique is proposed in [3] to skip high-frequency mode-transitions reducing overall glitching. While this improves the ACPR, the efficiency is degraded since there is no enhancement during a skipped transition.

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2.8 g类电压模式Doherty功率放大器

在现代通信中，宽带和高频谱效率的调制导致高峰均功率比(PAPR)，高达8至10dB。众所周知的pa效率增强技术，如Doherty和out - phasing，在超过6dB的回退时效率提高会降低，限制了高PAPR调制的效率提高。最近的研究表明，不同技术的组合[1-3]可以提高效率，远远超过6dB的回退。然而，当电源电压或负载阻抗在临界功率水平上发生较大变化时，这些组合技术的代价是模式转换引起的小故障。在[1,2]中，电源电压之间的切换会引起明显的故障，从而降低传输信号的EVM和ACPR。在[1]中，通过降低平均输出功率，降低电源开关频率，实现合理的EVM。[3]中提出了一种“跳窗”技术来跳过高频模式转换，减少整体故障。虽然这提高了ACPR，但效率降低了，因为在跳过转换期间没有增强。

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2017 IEEE International Solid-State Circuits Conference (ISSCC)

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