Design of a front-end analog channel with 80MHz bandwidth in digital oscilloscope

2017 First International Conference on Electronics Instrumentation & Information Systems (EIIS) Pub Date : 2017-06-01 DOI:10.1109/EIIS.2017.8298678

Zewei Jiang, Wang Liu

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引用次数: 2

Abstract

Aiming at the requirement of a high-frequency input analog signal conditioning in digital oscilloscope, an analog channel design with high bandwidth and large dynamic range is proposed. The analog channel is used to realize high-frequency analog signal converting to the best sampling range of high-speed ADC which is mainly composed of direct or passive attenuation circuit, impedance conversion circuit, digital step attenuator and fixed gain amplifier circuit. Emphasis on using OrCAD PSpice tool to build analog channel circuits and carry out functional simulation verification, high-frequency PCB circuit board is fabricated according to the simulation results, and output analog signals are measured when analog signals of different frequencies pass through the analog channel PCB circuit board. At the same time, adjusting the adjustable capacitor can make output analog signal flatness performance of frequency response curve better in the entire bandwidth, and I successfully give a good frequency response curve of the analog channel circuit by actual measurement results.

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80MHz带宽数字示波器前端模拟信道的设计

针对数字示波器对高频输入模拟信号调理的要求，提出了一种高带宽、大动态范围的模拟通道设计。模拟通道用于实现高频模拟信号转换到高速ADC的最佳采样范围，该ADC主要由直接或无源衰减电路、阻抗转换电路、数字阶跃衰减器和固定增益放大电路组成。重点利用OrCAD PSpice工具构建模拟通道电路并进行功能仿真验证，根据仿真结果制作高频PCB电路板，并测量不同频率的模拟信号通过模拟通道PCB电路板时输出的模拟信号。同时，调整可调电容可以使输出模拟信号在整个带宽内的频响曲线平坦度表现更好，并通过实际测量结果成功给出了模拟通道电路良好的频响曲线。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2017 First International Conference on Electronics Instrumentation & Information Systems (EIIS)

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