<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[qq_44827133的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/qq_44827133</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; qq_44827133]]></copyright><item><title><![CDATA[降压型电荷泵反相电源芯片的纹波说明]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/167589775</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/167589775</guid><author>qq_44827133</author><pubDate>Mon, 12 Oct 2026 00:54:51 +0800</pubDate><description><![CDATA[(3) 该芯片的PFM模式，这个模式可以降低轻负载时的功耗，且没有外引引脚来手动关闭。它通过飞电容(C1)周期性地在 VIN 充电、再反向倾倒到输出电容，把正电压变成负压。这一级是开关型电路，CPOUT 引脚输出的是未稳压的负压，带纹波。<100mA)，输出电容上的电荷流失很慢，没必要每拍都搬。(1) 电荷泵芯片的工作原理：「电荷泵逆变器 + 内置 LDO」的级联结构。但是该类芯片的输出电压是由R11、R15决定的。第二级：内置 LDO。(2) 电荷泵的原理决定了输出电压是一定小于输入电压的，芯片参数。]]></description><category></category></item><item><title><![CDATA[恒流源电路实现]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/166741255</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/166741255</guid><author>qq_44827133</author><pubDate>Wed, 07 Oct 2026 21:50:09 +0800</pubDate><description><![CDATA[集成度高的恒流源芯片型号很多，在这里介绍一种0~5mA的型号：BCR 400R。使用BCR 400R产生一个4mA的恒流源。电路设计如下：仿真搭建及仿真结果如下：IR2​IR2​。]]></description><category></category></item><item><title><![CDATA[STM32F103+Keil(485+ADC+DMA+TIMER+WDG+GPIO)]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/166015153</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/166015153</guid><author>qq_44827133</author><pubDate>Sun, 20 Sep 2026 23:14:37 +0800</pubDate><description><![CDATA[eg：接收：FF A5 03 00 11 00 14 7E发送：xx  xx  xx xx  xx xx  xx  xx。]]></description><category></category></item><item><title><![CDATA[Altium Designer中网络标识符的作用范围]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/164884771</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/164884771</guid><author>qq_44827133</author><pubDate>Tue, 15 Sep 2026 23:26:31 +0800</pubDate><description><![CDATA[平铺设计，只有网络标签和电源端口，没有端口的情况下，网络标签全局有效，且同名网络标签和电源端口相连。]]></description><category></category></item><item><title><![CDATA[时间分辨率、频率分辨率]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/123311734</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/123311734</guid><author>qq_44827133</author><pubDate>Tue, 08 Mar 2022 15:27:23 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[短时傅里叶变换STFT(matlab)]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/123295063</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/123295063</guid><author>qq_44827133</author><pubDate>Sun, 06 Mar 2022 15:54:02 +0800</pubDate><description><![CDATA[转载时频分析之STFT：短时傅里叶变换的原理与代码实现（非调用Matlab API）。
这篇文章介绍了FFT的缺点、STFT的原理、STFT在matlab上运用以及STFT的缺点，写的非常非常好。下面这篇文章主要对原理、STFT后生成的图进行个人注释。
原理
补充一张原理图(图片来源https://www.jianshu.com/p/7e160442830f)。

图像分析
close all; clear; clc;
fs = 1000;
t = 0:1/fs:4-1/fs;
L=4000;
% x = ]]></description><category></category></item><item><title><![CDATA[DFT的计算、FFT的基础代码、FFT的横纵坐标问题(matlab)]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/123142243</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/123142243</guid><author>qq_44827133</author><pubDate>Sat, 05 Mar 2022 15:00:40 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[时域、频域、傅里叶变换]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/123110340</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/123110340</guid><author>qq_44827133</author><pubDate>Fri, 25 Feb 2022 22:13:49 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[模拟频率、模拟角频率、数字频率、采样频率、信号原始频率]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/123067555</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/123067555</guid><author>qq_44827133</author><pubDate>Thu, 24 Feb 2022 13:56:22 +0800</pubDate><description><![CDATA[名称
单位
符号
意义




模拟频率

3
4


—
----
—
—


1
2
3
4


1
2
3
4



]]></description><category></category></item><item><title><![CDATA[常用数字信号处理方法在matlab上的实现(目录和先导)]]></title><link>https://blog.youkuaiyun.com/qq_44827133/article/details/123030088</link><guid>https://blog.youkuaiyun.com/qq_44827133/article/details/123030088</guid><author>qq_44827133</author><pubDate>Mon, 21 Feb 2022 16:19:43 +0800</pubDate><description><![CDATA[常用信号处理方法在matlab上的实现]]></description><category></category></item></channel></rss>