https://blog.youkuaiyun.com/yuweixianzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/yuweixian/article/details/6022302https://blog.youkuaiyun.com/yuweixian/article/details/6022302yuweixianFri, 19 Nov 2010 20:11:00 +0800我 胡汉三 又回来了  哈哈哈哈
 
O(∩_∩)O哈哈~]]>https://blog.youkuaiyun.com/yuweixian/article/details/5902398https://blog.youkuaiyun.com/yuweixian/article/details/5902398yuweixianThu, 23 Sep 2010 21:48:00 +0800   尽管在模拟量采集系统中，对ADC芯片等的供电一般建议最好不用电源 target=_blank>开关电源 ，以避免其固有的纹波大、噪声等问题，但电源 target=_blank>开关电源 仍以其高效率、低价格等优点得到广泛应用，尤其是在工业控制等领域。本文介绍电源 target=_blank>开关电源 在模拟量采集系统中的应用，并对可能出现的一些问题进行分析。 
电源 target=_blank>开关电源 对ADC芯片工作的影响及解决方法
电源]]>https://blog.youkuaiyun.com/yuweixian/article/details/5900004https://blog.youkuaiyun.com/yuweixian/article/details/5900004yuweixianTue, 21 Sep 2010 20:07:00 +0800    短波数字通信系统中接收机的AGC电路采用AD603可变增益放大器结合简单的AGC控制电路来实现，具有较高的增益，动态范围达70dB，频带宽度为90MHz，且电路结构相当简单。
       短波接收机在接收信号时，由于电离层的变化、衰落和接收信号条件等不同，其输入端信号电平在很大范围内变化。而接收机的输出功率是随外来信号的大小而变化 的，接收机的输出端会出现强弱非常悬殊的信号功率。为此，短波接收机中非常强调自动增益控制(AGC)电路。AGC电路是一种在输入信号幅度变化]]>https://blog.youkuaiyun.com/yuweixian/article/details/5899999https://blog.youkuaiyun.com/yuweixian/article/details/5899999yuweixianTue, 21 Sep 2010 19:58:00 +0800正文内容：
在很多信号采集系统中，信号变化的幅度都比较大，那么放大以后的信号幅值有可能超过A/D转 换的量程，所以必须根据信号的变化相应调整放大器的增益。在自动化程度要求较高的系统中，希望能够在程序中用软件控制放大器的增益，或者放大器本身能自动 将增益调整到适当的范围。AD603正是这样一种具有程控增益调整功能的芯片。它是美国ADI公司的专利产品，是一个低噪、90MHz带宽增益可调的集成 运放，如增益用分贝表示，则增益与控制电压成线性关系，压摆率为275V/μs。管脚间的连接方式]]>https://blog.youkuaiyun.com/yuweixian/article/details/5867072https://blog.youkuaiyun.com/yuweixian/article/details/5867072yuweixianMon, 06 Sep 2010 20:55:00 +0800
 
 
 
 

 
 
 

 
 
 

 
 
 

 
 
 
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https://blog.youkuaiyun.com/yuweixian/article/details/5863415https://blog.youkuaiyun.com/yuweixian/article/details/5863415yuweixianSat, 04 Sep 2010 16:27:00 +0800
 
 
 
 

 
 
 
 

 
 
 
 
 
 

 
 
 
 
 
 
 
 

 
 
 
 

 
 
 
 

https://blog.youkuaiyun.com/yuweixian/article/details/5814972https://blog.youkuaiyun.com/yuweixian/article/details/5814972yuweixianMon, 16 Aug 2010 10:20:00 +0800https://blog.youkuaiyun.com/yuweixian/article/details/5813461https://blog.youkuaiyun.com/yuweixian/article/details/5813461yuweixianSun, 15 Aug 2010 12:48:00 +0800https://blog.youkuaiyun.com/yuweixian/article/details/5811648https://blog.youkuaiyun.com/yuweixian/article/details/5811648yuweixianSat, 14 Aug 2010 10:49:00 +0800
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 

 
 
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