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所在平台: Udemy |
课程主页: https://www.udemy.com/course/rf_receiver_architectures/
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课程名称：射频电路与系统 - 射频接收机架构 课程概述： 本课程专注于无线通信系统中关键的射频收发器，主要包括接收机和发射机的设计与研究。课程开始时将提供发射机和接收机的重要设计规格概述，包括频带和信道划分、数据速率、调制类型、发射功率及谱掩码、发射机误差矢量幅度（EVM）、接收机灵敏度、输入电平及对干扰的容忍度等内容。 课程接下来将深入探讨无线接收机的设计，从射频信号的带通表示开始，讨论了信号完全恢复所需的象限下变换的必要性。学生将学习到异频架构及其面临的图像问题，意识到异频接收机在频道选择与图像抑制之间的权衡。 课程还将涵盖广泛使用的直接变换接收机架构，深入研究与直接变换接收机相关的各种问题，如本振泄漏、直流偏移、偶次失真、I/Q失衡及1/f噪声的影响。 此外，学生将了解图像抑制架构，并使用强大的图形分析来分析这些架构，进一步学习低IF接收机及多相滤波器。最后，课程将研究基于复杂混频器概念的双象限下变换接收机。 本课程是了解射频接收设计的重要学习工具，对希望深入射频电路与系统领域的学生尤为适合。
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 receivers. The course starts with an overview of important design specifications for both a transmitter and a receiver. Common specs such as frequency bands and channelization, data rate, type of modulation, transmitter output power and spectral mask, the transmitter EVM, receiver sensitivity, receiver input level, and receiver tolerance to blockers will be briefly discussed. The course then will provide an in-depth study of wireless receivers. Starting with bandpass representation of RF signals, the need for the quadrature downconversion to fully recover the signal is discussed. The course will then go over the concept of heterodyne architecture and investigates the problem of image in this architecture. The students will learn that a heterodyne receiver always faces a trade-off between channel selection and image rejection. Next, the widely used direct-conversion receiver architectures will be studied. The course provides a deep study of all issues in regard to the direct-conversion receiver including the local-oscillator leakage, the DC offset, even-order distortion, I/Q imbalance, and the impact of 1/f noise. Next, the image-reject architectures will be studied and a powerful graphical analysis is utilized to analyze these architectures. The course will go over the low-IF receivers and polyphase filters. Finally, the dual-quadrature downconversion receivers based on the concept of complex mixers will be studied.
