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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Three-Level De-Multiplexed Dual-Branch Complex Delta-Sigma Transmitter
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Three-Level De-Multiplexed Dual-Branch Complex Delta-Sigma Transmitter

机译：三电平解复用双分支复数Delta-Sigma变送器

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摘要

In this paper, a dual-branch topology driven by a Delta-Sigma Modulator (DSM) with a complex quantizer, also known as the Complex Delta Sigma Modulator (CxDSM), with a 3-level quantized output signal is proposed. By de-multiplexing the 3-level Delta-Sigma-quantized signal into two bi-level streams, an efficiency enhancement over the operational frequency range is achieved. The de-multiplexed signals drive a dual-branch amplification block composed of two switch-mode back-to-back power amplifiers working at peak power. A signal processing technique known as quantization noise reduction with In-band Filtering (QNRIF) is applied to each of the de-multiplexed streams to boost the overall performances; particularly the Adjacent Channel Leakage Ratio (ACLR). After amplification, the two branches are combined using a non-isolated combiner, preserving the efficiency of the transmitter. A comprehensive study on the operation of this topology and signal characteristics used to drive the dual-branch Switch-Mode Power Amplifiers (SMPAs) was established. Moreover, this work proposes a highly efficient design of the amplification block based on a back-to-back power topology performing a dynamic load modulation exploiting the non-overlapping properties of the de-multiplexed Complex DSM signal. For experimental validation, the proposed de-multiplexed 3-level Delta-Sigma topology was implemented on the BEEcube™ platform followed by the back-to-back Class-E switch-mode power amplification block. The full transceiver is assessed using a 4th-Generation mobile communications standard LTE (Long Term Evolution) standard 1.4 MHz signal with a peak to average power ratio (PAPR) of 8 dB. The dual-branch topology exhibited a good linearity and a coding efficiency of the transmitter chain higher than 72% across the band of frequency from 1.8 GHz to 2.7 GHz.
机译：在本文中，提出了一种由具有复杂量化器的Delta-Sigma调制器（DSM）驱动的双分支拓扑，也称为复杂Delta Sigma调制器（CxDSM），具有三电平量化输出信号。通过将3级Delta-Sigma量化的信号多路分解为两个双级流，可以在工作频率范围内提高效率。解复用后的信号驱动一个双分支放大模块，该模块由两个工作在峰值功率的开关模式背靠背功率放大器组成。一种被称为带内滤波量化降噪（QNRIF）的信号处理技术被应用于每个解复用的流，以提高整体性能。特别是相邻信道泄漏率（ACLR）。放大后，使用非隔离的合并器合并两个分支，从而保留了发射机的效率。建立了对该拓扑的操作和用于驱动双分支开关模式功率放大器（SMPA）的信号特性的综合研究。此外，这项工作提出了一种基于背对背功率拓扑的放大模块的高效设计，该拓扑利用解复用后的复数DSM信号的非重叠特性执行动态负载调制。为了进行实验验证，在BEEcube™平台上实施了建议的多路分解3级Delta-Sigma拓扑，然后是背对背E类开关模式功率放大模块。完整的收发器使用第4代移动通信标准LTE（长期演进）标准1.4 MHz信号进行评估，其峰均功率比（PAPR）为8 dB。双分支拓扑在1.8 GHz至2.7 GHz的整个频率范围内均具有良好的线性度和发射器链的编码效率，高于72％。

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