A 1.95 GHz Fully Integrated Envelope Elimination and Restoration CMOS Power Amplifier Using Timing Alignment Technique for WCDMA and LTE
A 1.95 GHz Fully Integrated Envelope Elimination and Restoration CMOS Power Amplifier Using Timing Alignment Technique for WCDMA and LTE
复制标题
采用时序对准技术的 1.95 GHz 全集成包络消除和恢复 CMOS 功率放大器，适用于 WCDMA 和 LTE
DOI：
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发表时间：
2014
影响因子：
5.4
通讯作者：
Toshihiko Mori
中科院分区：
文献类型：
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作者：
K. Oishi;Eiji Yoshida;Yasufumi Sakai;H. Takauchi;Y. Kawano;Noriaki Shirai;H. Kano;M. Kudo;T. Murakami;T. Tamura;S. Kawai;Kazuo Suto;H. Yamazaki;Toshihiko Mori
为WCDMA和LTE手机开发了一种全集成包络消除和恢复（EER）CMOS功率放大器（PA）。EER是一种电源调制技术，它首先将调制的RF信号分为包络和相位信号，然后在开关PA输出端恢复。开关PA的电源电压通过高速电源调制器由包络信号调制。由于开关PA和电源调制，EER PA非常高效。然而，尤其是对于像LTE这样的宽带宽基带应用，通常难以实现相位信号路径的宽带宽以及包络和相位信号之间的高精度定时。为了克服这些挑战，提出了一种基于混频器和限幅器的包络/相位发生器来产生宽带相位信号，并提出了一种基于可变高通滤波器（HPF）的延迟锁定环的定时对准器来补偿定时失配。该芯片采用90 nm CMOS工艺实现。WCDMA的实测功率附加效率（PAE）和邻道泄漏比（ACLR）分别为39%和-41 dBc，20 MHz-BW LTE的实测PAE和ACLR E-UTRA 1分别为32%和-33 dBc。
A fully integrated envelope elimination and restoration (EER) CMOS power amplifier (PA) has been developed for WCDMA and LTE handsets. EER is a supply modulation technique that first divides modulated RF signal into envelope and phase signals and then restores it at a switching PA output. Supply voltage of the switching PA is modulated by the envelope signal through a high-speed supply modulator. EER PA is highly efficient due to the switching PA and the supply modulation. However, it generally has difficulty, especially for a wide bandwidth baseband application like LTE, achieving a wide bandwidth for phase signal path and highly accurate timing between envelope and phase signals. To overcome these challenges, an envelope/phase generator based on a mixer and a limiter was proposed to generate the wide bandwidth phase signal, and a timing aligner based on a delay locked loop with a variable high-pass filter (HPF) was proposed to compensate for the timing mismatch. The chip was implemented in 90 nm CMOS technology. Measured power-added efficiency (PAE) and adjacent channel leakage ratio (ACLR) were 39% and -41 dBc for WCDMA, and measured PAE and ACLR E-UTRA1 were 32% and -33 dBc for 20 MHz-BW LTE.