| ADC外围电路的设计 |
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| 引用本文： | 高中义.ADC外围电路的设计[J].现代电子技术,2010,33(22):3-4,8. |
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| 作者姓名： | 高中义 |
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| 作者单位： | 白城职业技术学院机电工程系; |
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| 摘 要： | ADC外围电路的设计通常包括模拟电路、数字电路和电源电路的设计。为了满足ADC的需要,ADC外围电路的设计重点是输入放大信号,为了使其充分发挥整体性能,必须在ADC转换期间保持输入电压的稳定;为了消除模拟多路开关因阻抗不匹配和转换阶跃信号变化对ADC输入及采样阶段的影响,需在多路开关与ADC之间加接高输入阻抗的电压跟随器,并待阶跃变化稳定后,再让采样保持电路进入采样阶段;为了满足微控制器对时序的要求,必须选择恰当的接口形式。此外,采用良好的接地方式与电压去耦方法,可以避免模拟信号和数字信号受到噪声干扰,也可避免两种信号产生互相干扰。为了防止噪声对数字信号的影响,还使用了相应的隔离方式。
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| 关 键 词： | 放大 匹配 时序 去耦 隔离 |
Design of ADC Peripheral Circuit |
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| GAO Zhong-yi.Design of ADC Peripheral Circuit[J].Modern Electronic Technique,2010,33(22):3-4,8. |
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| Authors: | GAO Zhong-yi |
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| Institution: | GAO Zhong-yi(Mechanical and Electrical Engineering Department,Baicheng Professional Technology Institute,Baicheng 137000,China) |
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| Abstract: | The main design of ADC peripheral circuit includes analog circuit,digital circuit and power circuit.The amplifying signal input is important to meet the requirement of ADC,and the stability of input voltage between ADC conversion should be kept to enable its overall performance.In order to eliminate the influence of unmatched impedance and transformation step signal change factor of simulation multi-way switch on the ADC input and sampling stage,the voltage follower with high input impedance should be used ... |
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| Keywords: | enlarge match timing decoupling isolation |
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