Analysis of Systematic Losses in Hybrid Envelope Tracking Modulators
Analysis of Systematic Losses in Hybrid Envelope Tracking Modulators
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DOI：
10.1109/tcsi.2018.2883531
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发表时间：
2019-04-01
影响因子：
5.1
通讯作者：
Heo, Deukhyoun
中科院分区：
文献类型：
--
作者：
Renaud, Luke;Baylon, Joseph;Heo, Deukhyoun
本文对包络跟踪功率放大器系统中使用的混合包络跟踪电源调制器的固有损耗进行了全面分析。这些子系统完全根据系统参数和单个设计参数进行象征性计算。所得公式用于提供最佳偏置的设计见解，以最大限度地减少混合配置中的损耗，并建立可实现效率的理论上限。为了说明此分析的价值，使用瑞利分布式波形来评估混合调制器的性能，以描述 OFDM 和其他复杂的调制方案。本文证明，从损耗的角度来看，将线性转换器的输出级偏置为具有零平均电流的常见惯例通常不是最佳的，并确定了如何在不修改底层电路拓扑的情况下提高效率。这些发现通过对 180 nm CMOS 工艺中实现的混合调制器进行建模的一系列仿真得到了验证。本文首次推导出混合包络调制器配置中的固有理论损耗。
This paper presents a comprehensive analysis of the intrinsic losses in hybrid envelope tracking power supply modulators used in envelope tracking power amplifier systems. The lasses are computed entirely symbolically in terms of system parameters and a single design parameter. Resulting formulations are used to provide design insight into optimum biasing to minimize losses in a hybrid configuration, and establish the theoretical upper bound of achievable efficiency. To illustrate the value of this analysis, a Rayleigh distributed waveform is used to evaluate the performance of the hybrid modulator to describe OFDM and other complex modulation schemes. This paper demonstrates that the common convention of biasing the linear converter's output stage to have zero average current is generally suboptimal from a loss perspective, and establishes how efficiency can be improved without modifying the underlying circuit topology. These findings are validated with a series of simulations modeling a hybrid modulator implemented in a 180-nm CMOS process. This paper derives for the first time, the intrinsic theoretical losses in the hybrid envelope modulator configuration.