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所在平台: Udemy |
课程主页: https://www.udemy.com/course/oscillators/
课程评论：没有评论
**课程名称：** RF 电路与系统 - 振荡器 **课程概述：** 本课程深入探讨振荡器的原理与设计。振荡器是一种能够产生持续振荡的自激电路。课程将振荡器建模为闭环反馈系统，通过分析幅度和相位特性推导出振荡的必要条件。 **主要内容：** * **反馈与振荡条件：** 学习将振荡器视为闭环反馈系统，推导振荡条件。 * **环形振荡器：** 设计基于反馈和振荡条件的数级环形振荡器，并进行大信号分析，探讨可用于环形振荡器的延迟单元。 * **极零点分析：** 利用极零点模式分析闭环反馈系统以产生振荡。 * **LC 振荡器：** 克服 LC 电路中无源元件损耗对稳态振荡的影响，学习损耗补偿网络，包括反馈理论和负阻有源器件。 * **交叉耦合对振荡器：** 从零开始学习交叉耦合对振荡器，包括作为 Colpitts、Clapp 和 Pierce 等拓扑基础的电路。 * **压控振荡器 (VCO)：** 学习 VCO 的设计规范，并介绍实现环形振荡器调谐的机制和电路技术。 * **调谐技术：** 深入研究基于变容管的 LC VCO，了解变容管的局限性，并引入离散调谐和电感调谐（包括磁调谐和有源电感）。 * **片上电感器：** 回顾片上电感器，讨论其集总参数电路模型。 * **相位噪声：** 概述相位噪声，介绍线性时不变模型和 Leeson 公式。 **课程亮点：** 本课程提供从基础理论到实际应用的全方位学习体验，涵盖了不同类型的振荡器设计及其关键技术，尤其在调谐机制和相位噪声分析方面进行了深入讲解。
This course focuses on the study and design of oscillators. As we will learn, oscillators are autonomous circuits capable of producing sustainable oscillation. The course starts by modeling the oscillator as a closed-loop feedback system. By investigating the magnitude and phase plots, the necessary conditions for oscillation are then derived. Multi-stage ring oscillator based on the feedback concepts and oscillation condition will then be designed. The large-signal study of a ring oscillator will then be presented. This will be followed by proposing several delay-stage candidates for a ring oscillator. The course then studies the pole-zero pattern of a closed-loop feedback system to be able to generate oscillation. Looking at the LC circuits, we will learn that the passive components inevitably have losses that prevent the LC network to generate steady-state oscillation. We will then study loss-compensation networks from two perspectives, namely, (a) feedback theory and (b) active devices exhibiting negative resistance. The course then offers a ground-up approach to cross-coupled pair oscillators. We will then learn about a basic network that plays a foundational block for a class of oscillators such as Colpitts, Clapp, and Pierce topologies.The course will then introduce voltage-controlled oscillators (VCOs). We will learn about a number of design specifications for VCO design. Next, several mechanisms and circuit techniques will be introduced that will enable tuning in a ring oscillator. This will be followed by an in-depth study of varactor-based LC VCOs. We will also learn that varactor has limited quality factors and oscillators based on varactors cannot have a wide tuning range. We will then introduce the concept of discrete tuning. Finally, we learn about the concept of inductive tuning and present two approaches based on magnetic tuning and active inductors that facilitate inductive tuning.Since inductors are essential components in oscillators, we will review on-chip inductors and discuss a lumped electrical network that models these inductors.The course will finally offer a general overview of phase noise. We briefly discuss a linear-time invariant approach to model the phase noise, and finally, we will discuss the widely used Leeson formula for phase noise modeling.
