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所在平台: Udemy |
课程主页: https://www.udemy.com/course/rf_transmitters/
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**课程名称：** RF电路与系统 - RF发射器架构 **课程概述：** 本课程深入探讨射频（RF）发射器的设计与挑战。从RF发射器的整体架构和关键设计难点入手，课程将详细分析无线发射器中的核心问题。 **主要内容包括：** * **I/Q不匹配：** 讲解I/Q不匹配对发射器性能的影响，并介绍基于信号镜像检测的校准技术。 * **载波泄漏：** 分析载波泄漏问题及其对信号星座图的干扰。 * **功率放大器与线性度：** 探讨功率放大器在RF发射器中的重要性，以及为避免EVM degradation所需的功率回退（back-off）原因。 * **本地振荡器（LO）牵引：** 研究LO牵引问题，并学习如何解决RF发射器中的LO牵引。 * **替代发射器结构：** 介绍包括LO工作在RF频率两倍的直接变频发射器、外差发射器、双上变频发射器和滑动中频（IF）发射器等多种替代发射器架构。
A radio-frequency transceiver comprising a receiver and a transmitter is the main system responsible for establishing communication between users of the communication system. This lecture focuses on the study and design of radio-frequency transmitters. The course starts with an overview of an RF transmitter and important design challenges in designing these systems. The course then will provide an in-depth study of wireless transmitters. Starting with the problem of in-phase/quadrature (I/Q) mismatch and its impact on the transmitter performance, the course teaches a technique based on the detection of the signal mirror to calibrate the mismatch. The course then will go over another problem commonly seen in RF transmitters, which the carrier leakage. The students will learn that carrier leakage will disturb the signal constellation. Next, the important issue of the power amplifier and transmitter linearity will be studied. The students will learn the reason for the power-amplifier back-off to avoid EVM degradation. Next, the problem of local-oscillator pulling will be studied. Methods of combating the oscillator pulling in an RF transmitter. An overview of alternative transmitter structures including the direct conversion transmitter with LO working at twice the RF frequency, heterodyne, dual upconversion, and sliding IF transmitters will be introduced.
