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所在平台: Udemy |
课程主页: https://www.udemy.com/course/vsd-intern-10-bit-dac-design-using-esim-and-sky130/
课程评论：没有评论
课程名称：VSD Intern - 基于eSim和Sky130的10位DAC设计 课程概述：我们生活的世界中，大多数信号本质上是模拟信号，而数字系统只能理解数字信号，因此，将数字系统与外部的模拟世界进行接口显得尤为重要。输入端的模拟信号需要通过模拟到数字转换器（ADC）转换成数字信号，然后经过系统处理后，数字信号又需要通过数字到模拟转换器（DAC）转换回模拟信号。n位数字到模拟转换器（DAC）可以将n位数字字转换为与参考电压成比例的模拟电压。电位分压DAC利用电压分配器的原理，在N位DAC中，模拟电压范围（即Vref，设为3.3V）被平均分为2^N个电压值。通过一系列2^N个相等的电阻实现，并在每个电阻上提供接点。使用N位数字字作为输入设计切换开关组合。该电路使用eSim（以前称为Oscad / FreeEDA）进行设计，eSim是一款免费的开源电子设计自动化（EDA）工具，用于电路设计、仿真、分析和PCB设计。它是基于KiCad、Ngspice和GHDL等自由和开源软件构建的集成工具，发布于GPL许可证下。eSim提供了与任何专有软件类似的能力和易用性，使得用户无需支付高额的许可证费用，因此可以成为教育机构和中小企业的经济替代方案，能够替代如OrCAD、Xpedition和HSPICE等商业软件工具。 该课程适合对DAC设计及电路仿真感兴趣的学生和专业人士，能够帮助他们通过实践了解模拟与数字信号之间的转化过程。
Most of the signals around us, in the world we live in are not digital in nature, rather they are analog. The digital systems can understand only digital signals, not analog. Hence, it becomes important to interface the digital systems we the external analog world. The analog input signals are to be converted to digital signals using Analog to Digital Converters at the input end of the digital system. After the processing by the system, the digital signals are to be converted back into analog signals using Digital to Analog Converters.A n-bit Digital to Analog Converter (DAC) takes a n-bit digital word and converts it into a proportional analog voltage with respect to the reference voltage. The potentiometric DAC uses the concept of Voltage Divider. In an N-bit DAC, the analog voltage range, i.e. the Vref (here 3.3 V) is equally divided into 2^N voltage values. This is achieved by a series on 2^N equal resistors and taps are provided across each R. The combination of switches to tap the values is designed using the N-bit digital word as input.This circuit was designed using eSimeSim (previously known as Oscad / FreeEDA) is a free/libre and opensource EDA tool for circuit design, simulation, analysis and PCB design. It is an integrated tool built using free/libre and opensource software such as KiCad, Ngspice and GHDL. eSim is released under GPL.eSim offers similar capabilities and ease of use as any equivalent proprietary software for schematic creation, simulation and PCB design, without having to pay a huge amount of money to procure licenses. Hence it can be an affordable alternative to educational institutions and SMEs. It can serve as an alternative to commercially available/licensed software tools like OrCAD, Xpedition and HSPICE.
