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<a href="/ICnotes7/" class="post-title-link" itemprop="url">集成电路设计笔记（七）基于IC617UVLO设计</a>
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<time title="创建时间：2020-06-24 16:47:42 / 修改时间：17:33:55" itemprop="dateCreated datePublished" datetime="2020-06-24T16:47:42+08:00">2020-06-24</time>
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<h3 id="1-什么是UVLO"><a href="#1-什么是UVLO" class="headerlink" title="1. 什么是UVLO"></a>1. 什么是UVLO</h3><hr>
<p>欠压锁定（Undervoltage-Lockout）简称UVLO，是电子设备中在电源电压低于正常工程准位时，切断电源的电路。在嵌入式系统中常会用UVLO监控电池电压，若电压低于一定值，会直接切断电源，保护嵌入式系统的电路。 </p>
<p>许多电子设备中都有UVLO的功能，例如在镇流器中就有UVLO电路，若电压过低时直接切断电源。</p>
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<a href="/ICnotes6/" class="post-title-link" itemprop="url">集成电路设计笔记（六）基于IC617设计运算放大器</a>
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<h3 id="1-什么是运放？"><a href="#1-什么是运放？" class="headerlink" title="1. 什么是运放？"></a>1. 什么是运放？</h3><hr>
<p>运算放大器（简称“运放”）是具有很高放大倍数的电路单元。在实际电路中，通常结合反馈网络共同组成某种功能模块。它是一种带有特殊耦合电路及反馈的放大器。其输出信号可以是输入信号加、减或微分、积分等数学运算的结果。是电路中的一个常用结构。</p>
<p>运放的结构多种多样，本文记录一种简单的结构</p>
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<p>本文主要记录共漏极放大器的原理与仿真验证</p>
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<h3 id="1-原理"><a href="#1-原理" class="headerlink" title="1. 原理"></a>1. 原理</h3><hr>
<p>电路结构如图所示</p>
<p><img src="https://ccbirds-blog.oss-cn-beijing.aliyuncs.com/blog_img/%E9%9B%86%E6%88%90%E7%94%B5%E8%B7%AF%E8%AE%BE%E8%AE%A1%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0%EF%BC%88%E4%BA%94%EF%BC%89/551.png" alt></p>
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<p>本文主要记录带源极负反馈的共源级的放大器的原理及仿真验证</p>
<hr>
<h3 id="1-原理"><a href="#1-原理" class="headerlink" title="1. 原理"></a>1. 原理</h3><hr>
<p>电路如图所示，$R_S$为源极反馈电阻</p>
<p><img src="https://ccbirds-blog.oss-cn-beijing.aliyuncs.com/blog_img/%E9%9B%86%E6%88%90%E7%94%B5%E8%B7%AF%E8%AE%BE%E8%AE%A1%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0%EF%BC%88%E4%BA%94%EF%BC%89/cs51.png" alt></p>
<p>交流小信号如图所示</p>
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<p>本文记录电流源负载的共源极放大器。</p>
<hr>
<h3 id="1-基本原理"><a href="#1-基本原理" class="headerlink" title="1.基本原理"></a>1.基本原理</h3><hr>
<p>基本电路结构如下图所示。</p>
<p><img src="https://ccbirds-blog.oss-cn-beijing.aliyuncs.com/blog_img/%E9%9B%86%E6%88%90%E7%94%B5%E8%B7%AF%E8%AE%BE%E8%AE%A1%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0%EF%BC%88%E4%BA%94%EF%BC%89/cs31.png" alt></p>
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<p>本文记录以二极管连接的MOS作为负载的共源极放大器。</p>
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<h3 id="1-原理分析"><a href="#1-原理分析" class="headerlink" title="1. 原理分析"></a>1. 原理分析</h3><hr>
<p>二极管连接的MOS管如下图所示。</p>
<p><img src="https://ccbirds-blog.oss-cn-beijing.aliyuncs.com/blog_img/%E9%9B%86%E6%88%90%E7%94%B5%E8%B7%AF%E8%AE%BE%E8%AE%A1%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0%EF%BC%88%E4%BA%94%EF%BC%89/cs1.png" alt></p>
<p>无论PMOS还是NMOS，当导通时，均工作在饱和区。</p>
<p>等效电阻为</p>
<p>$$R_x=\frac{V_x}{I_x}=\frac{1}{g_m}//R_o\approx\frac{1}{g_m}$$</p>
<p>以二极管连接的mos作负载的共源极放大器电路连接如下图所示</p>
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