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所在平台: Udemy |
课程主页: https://www.udemy.com/course/vco-design-for-pll-and-dll/
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**课程名称：** 环形压控振荡器（VCO）设计在锁相环（PLL）和延迟锁定环（DLL）应用中的设计 **课程概述：** 本课程深入探讨了在电子设计中至关重要的时间参考信号——时钟。时钟是协调电子设备中各项活动、事件和执行顺序的关键。压控振荡器（VCO）作为时序电路中的核心组件，在电子世界中扮演着重要角色。VCO可以通过电压或电流进行控制，其主要实现方式包括环形振荡器和 LC tank 振荡器。虽然高精度振荡器多采用 LC tank 结构，但环形振荡器在低频应用领域同样广泛。 设计高性能压控振荡器（VCO）并非易事，需要综合考虑电路设计、元件选择和版图布局等多个因素。成功的 VCO 设计需要扎实的理论基础、审慎的元件选择以及精良的定制版图。即使借助电路仿真，VCO 的版图设计也可能需要多次迭代才能达到理想性能。 要实现 VCO 的压控调谐功能，通常会采用变容二极管来构建可调电容，并通过施加调谐电压来控制振荡频率。
Every activity in the world is designed to work on a time reference. Timing is important for determining a relationship between events and activities in the world. A method to have a time reference in the electronic design is Clock. A clock is a signal used to provide the time reference for all the activities, events and order in which the execution has to take place. Controlled Oscillators are an important cog-in-the-wheel of the timing circuit in the electronics world. They can be controlled either using voltage or current. The VCOs are designed using Ring Oscillators or LC Tank oscillators. The high performance oscillators are part of the LC Tank domain while the low frequency oscillators are done using Ring Oscillator.The design of a high performance voltage controlled oscillator, VCO, is not is not a trivial task. Consideration of the circuit, components used and the layout all play a role in determining the performance. This requires sound theoretical design, followed by careful choice of all the components and then a good custom layout. Even with circuit simulation, it may take a couple of iterations of the VCO layout.To make a VCO, the oscillator needs to be tuned by a voltage. This can be achieved by making the variable capacitor from varactor diodes. The tune voltage for the VCO can then be applied to the varactors.
