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首页> 外文期刊>IEEE transactions on circuits and systems . I , Regular papers >Least-Squares Phase Predistortion of a +30 dBm Class-D Outphasing RF PA in 65 nm CMOS
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Least-Squares Phase Predistortion of a +30 dBm Class-D Outphasing RF PA in 65 nm CMOS

机译：65 nm CMOS中+30 dBm D类同相RF PA的最小二乘相位预失真

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摘要

This paper presents a model-based phase-only predistortion method suitable for outphasing radio frequency (RF) power amplifiers (PA). The predistortion method is based on a model of the amplifier with a constant gain factor and phase rotation for each outphasing signal, and a predistorter with phase rotation only. Exploring the structure of the outphasing PA, the model estimation problem can be reformulated from a nonconvex problem into a convex least-squares problem, and the predistorter can be calculated analytically. The method has been evaluated for 5 MHz Wideband Code-Division Multiple Access (WCDMA) and Long Term Evolution (LTE) uplink signals with Peak-to-Average Power Ratio (PAPR) of 3.5 dB and 6.2 dB, respectively, applied to one of the first fully integrated +30 dBm Class-D outphasing RF PAs in 65 nm CMOS. At 1.95 GHz for a 5.5 V (6.0 V) supply voltage, the measured output power of the PA was +29.7 dBm (+30.5 dBm) with a power-added efficiency (PAE) of 27%. For the WCDMA signal with +26.0 dBm of channel power, the measured Adjacent Channel Leakage Ratio (ACLR) at 5 MHz and 10 MHz offsets were ${-}$ 46.3 dBc and ${-}$ 55.6 dBc with predistortion, compared to ${-}$35.5 dBc and ${-}$48.1 dBc without predistortion. For the LTE signal with +23.3 dBm of channel power, the measured ACLR at 5 MHz offset was ${-}$ 43.5 dBc with predistortion, compared to ${-}$34.1 dBc without predistortion.
机译：本文提出了一种基于模型的仅相位预失真方法，适用于淘汰射频（RF）功率放大器（PA）。预失真方法基于一个放大器模型，该模型对每个异相信号均具有恒定的增益因子和相位旋转，以及仅具有相位旋转的预失真器。探索过相PA的结构，可以将模型估计问题从非凸问题改写为凸最小二乘问题，并可以解析地计算预失真器。该方法已针对5 MHz宽带码分多址（WCDMA）和长期演进（LTE）上行信号进行了评估，其峰均功率比（PAPR）分别为3.5 dB和6.2 dB，适用于首款采用65 nm CMOS的，完全集成的+30 dBm D类过频RF PA。对于5.5 V（6.0 V）的电源电压，在1.95 GHz时，测得的PA输出功率为+29.7 dBm（+30.5 dBm），功率附加效率（PAE）为27％。对于具有+26.0 dBm信道功率的WCDMA信号，在5 MHz和10 MHz偏移处测得的相邻信道泄漏比（ACLR）为<公式式>“ inline”> $ {-} $ 46.3 dBc和 $ {-} $ 具有55.6 dBc的预失真，相比于 $ {-} $ 35.5 dBc和 $ {-} $ 没有预失真的48.1 dBc。对于具有+23.3 dBm信道功率的LTE信号，在5 MHz偏移处测得的ACLR为 $ {-} $ 43.5带有预失真的dBc，与没有预失真的34.1 dBc相比， $ {-} $ 。

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