<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[qq_44656374的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/qq_44656374</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; qq_44656374]]></copyright><item><title><![CDATA[FFT频谱泄露和窗函数]]></title><link>https://blog.youkuaiyun.com/qq_44656374/article/details/136130075</link><guid>https://blog.youkuaiyun.com/qq_44656374/article/details/136130075</guid><author>qq_44656374</author><pubDate>Fri, 16 Feb 2024 16:45:00 +0800</pubDate><description><![CDATA[但是实际的输入信号我们并不知道它精确的频率/周期，只能估算大概的值，所以在采样时一定会有截断，截断的部分隐含周期性，在边界不连续，产生高频分量，不再满足奈奎斯特采样定理，导致频谱混叠/泄露。不同窗函数具有不同的主瓣和旁瓣，主瓣越宽，导致信号分散点越多，降低频率分辨率；旁瓣越高，导致频谱越容易泄露。FFT在满足非相干采样fin/fs=M/N，M和N互质时不存在频谱泄露。解决方法是添加窗函数，使截断的信号在首尾均接近于0，形成周期采样。逐次逼近模/数转换器(SAR ADC)设计与仿真 何乐年。]]></description><category></category></item><item><title><![CDATA[DR和SNR]]></title><link>https://blog.youkuaiyun.com/qq_44656374/article/details/136124803</link><guid>https://blog.youkuaiyun.com/qq_44656374/article/details/136124803</guid><author>qq_44656374</author><pubDate>Thu, 15 Feb 2024 23:51:59 +0800</pubDate><description><![CDATA[DR和SNR]]></description><category></category></item><item><title><![CDATA[采样频率、采样间隔、采样率、转换速率]]></title><link>https://blog.youkuaiyun.com/qq_44656374/article/details/135048354</link><guid>https://blog.youkuaiyun.com/qq_44656374/article/details/135048354</guid><author>qq_44656374</author><pubDate>Sun, 17 Dec 2023 19:00:25 +0800</pubDate><description><![CDATA[为了保证转换的正确完成，采样速率(Sample Rate)必须小于或等于转换速率(Conversion Rate)，可以说转换速率是最大采样速率。每秒采样的信号点数量，单位S/s(Samples per second)；采样信号的频率，等于采样信号周期/采样间隔的倒数，单位Hz；ADC每秒完成的转换次数；]]></description><category></category></item><item><title><![CDATA[学习笔记-20231023-比较器]]></title><link>https://blog.youkuaiyun.com/qq_44656374/article/details/133981587</link><guid>https://blog.youkuaiyun.com/qq_44656374/article/details/133981587</guid><author>qq_44656374</author><pubDate>Mon, 23 Oct 2023 10:38:59 +0800</pubDate><description><![CDATA[phase1：复位，CLK=0,S1-S4导通，M7关断，XYPQ复位至VDD；phase2：放大；CLK=1,S1-S4关断，M7导通；M1-M2工作于饱和区，根据输入相对大小，将PQ点电压以不同的速率下拉，直至一点先下拉至VDD-VTHN使M3-M4其中一个先导通；放大区等效增益为gm1,2·VTHN/ICM；phase3 ：N交叉耦合对导通；]]></description><category></category></item></channel></rss>