Lossless inductor current control in envelope tracking supply modulator with self-allocation of energy for optimzation of efficiency and EVM

2016 IEEE Asian Solid-State Circuits Conference (A-SSCC) Pub Date : 1900-01-01 DOI:10.1109/ASSCC.2016.7844190

Shang-Hsien Yang, Ke-Horng Chen, Chinder Wey, Ying-Hsi Lin, Jian-Ru Lin, Tsung-Yen Tsai

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引用次数: 2

Abstract

Conventional hybrid supply modulator for envelope tracking (ET) technique requires the linear amplifier to track a RF envelop signal with the help of switching converter to provide average power for high efficiency. Any distortion caused by resistive and inaccurate current sensing will result in increase of power loss and Error Vector Magnitude (EVM). Thus, a lossless inductor current control (LICC) with a closed-loop self-allocation technique is proposed to increase efficiency and decrease the EVM. Inductor current ripple information is directly extracted from the gate drive signal of a class-AB linear amplifier and a weighted self-allocation control is applied to optimize for efficiency and EVM. Extra power improvement of 2.5% can be derived. Owing to the removal of a power-consuming sensing resistor in conventional design, the efficiency can be effectively improved. The proposed supply modulator is capable of delivering an instantaneous peak power of 3.36W and a bandwidth of 20MHz with an averaged efficiency up to 85%.

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基于自分配能量的包络跟踪电源调制器的无损电感电流控制，以优化效率和EVM

传统的用于包络跟踪(ET)技术的混合电源调制器需要线性放大器在开关转换器的帮助下跟踪射频包络信号，以提供平均功率以实现高效率。任何由电阻性和不准确的电流传感引起的畸变都会导致功率损耗和误差矢量幅度(EVM)的增加。为此，提出了一种采用闭环自分配技术的电感电流无损控制(LICC)，以提高效率和降低EVM。直接从ab类线性放大器的栅极驱动信号中提取电感电流纹波信息，并采用加权自分配控制对效率和EVM进行优化。可以得到2.5%的额外功率改进。由于在传统设计中去掉了耗能的传感电阻，可以有效地提高效率。所提出的电源调制器能够提供3.36W的瞬时峰值功率和20MHz的带宽，平均效率高达85%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE Asian Solid-State Circuits Conference (A-SSCC)

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