A 21-to-31GHz DPD-less Quadrature RFDAC with Invariant Impedance and Scalable LO Leakage

📋 论文概要

本文提出了一种21-31GHz无数字预失真（DPD-less）正交射频数模转换器（RFDAC），通过不变阻抗和可缩放LO泄漏技术解决毫米波频率下RFDAC非线性问题，提升发射机线性度。

💡 主要创新点

• 提出不变输出阻抗技术，使单元阵列阻抗不随基带码变化，改善毫米波线性度。
• 实现可缩放LO泄漏，支持灵活配置以优化发射机性能。
• 无DPD设计，降低系统复杂度和功耗。

🏷 关键词

📄 原文摘要

The increasing data-rates of modern wireless communication systems require transmitters with high linearity to support high-order QAM modulation and wide modulation bandwidths. Digital transmitters based on RF digital-to-analog converters (RFDACs) [1-7] have drawn significant interest due to their ability to directly and efficiently convert digital bits to RF signals, offering a flexible, multi-mode, low-cost topology. However, nonlinearity is common in RFDACs and tends to worsen at mm-wave frequencies (Fig. 5.9.1(top)) due to the varied output impedance of unit arrays versus the baseband code, distributed parasitics, and LO leakage. Various linearization techniques for digital transmitters have been developed, such as digital pre-distortion (DPD) [1-7], open-loop linearization techniques [8-12], and onchip self-calibration [13,14]. Both the DPD and open-loop linearization techniques are not

👥 作者与机构

Huizhen Jenny Qian, Wubo Qin, Chenxi Qiu, Yintang Yang

Xidian University, Xi’an, China