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<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6253059d6caf5961927bd69d/bg2.jpg"><div class="t m0 x1 h4 y3 ff3 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h5 y4 ff4 fs2 fc0 sc0 ls0 ws0">微信搜索“<span class="ff5">AD<span class="_ _0"></span>I<span class="_ _1"> </span><span class="ff4">智库”，<span class="_ _0"></span>获取更多技术资<span class="_ _0"></span>料<span class="ff5"> <span class="_ _2"> </span>1 </span></span></span></div><div class="t m0 x4 h6 y5 ff6 fs3 fc0 sc0 ls0 ws0">简介<span class="ff3"> </span></div><div class="t m0 x3 h7 y6 ff4 fs1 fc0 sc0 ls0 ws0">通常来说，<span class="_ _3"></span>高速电路是指电路处理的信号频率足够高使得传输线对该频率表现的阻抗足</div><div class="t m0 x3 h8 y7 ff4 fs1 fc0 sc0 ls0 ws0">以对信号产生影响，工作在这种频率上的电路。<span class="ff5"> </span></div><div class="t m0 x3 h8 y8 ff4 fs1 fc0 sc0 ls0 ws0">《高速电路设计指南》<span class="_ _4"></span>以<span class="_ _5"> </span><span class="ff5">ADI<span class="_ _5"> </span></span>官方网站的技术文章和模拟对话为基础资料来源整理成册。</div><div class="t m0 x3 h8 y9 ff4 fs1 fc0 sc0 ls0 ws0">从设计实践角度出发，介绍在高速电路设计中需要掌握的各项技术及技能。<span class="ff5"> </span></div><div class="t m0 x3 h9 ya ff3 fs1 fc0 sc0 ls0 ws0"> </div><div class="c x5 yb w2 ha"><div class="t m0 x6 h8 yc ff5 fs1 fc0 sc0 ls0 ws0"> </div></div><div class="c x7 yb w3 ha"><div class="t m0 x8 h8 yd ff5 fs1 fc0 sc0 ls0 ws0">ADI<span class="_ _6"> </span><span class="ff4">智库是<span class="_ _6"> </span></span>ADI<span class="_ _6"> </span><span class="ff4">公司面向中国工程师打造的一站式资源分享</span></div><div class="t m0 x8 h8 ye ff4 fs1 fc0 sc0 ls0 ws0">平台，除了汇聚<span class="_ _7"> </span><span class="ff5">ADI<span class="_ _7"> </span></span>官网的海量技术资料、视频外，还有大</div><div class="t m0 x8 h7 yf ff4 fs1 fc0 sc0 ls1 ws0">量首发的、免费的培训课程、视频直播等。九大领域、十项</div><div class="t m0 x8 h8 y10 ff4 fs1 fc0 sc0 ls0 ws0">技术，加入<span class="_ _7"> </span><span class="ff5">ADI<span class="_ _7"> </span></span>智库，您可以尽情的浏览收藏、下载相关资</div><div class="t m0 x8 h7 y11 ff4 fs1 fc0 sc0 ls1 ws0">源。此外，您还可一键报名线上线下会议活动，更有参会提</div><div class="t m0 x8 h8 y12 ff4 fs1 fc0 sc0 ls0 ws0">醒等贴心服务。<span class="ff5"> </span></div></div></div><div class="pi" data-data='{"ctm":[1.611792,0.000000,0.000000,1.611792,0.000000,0.000000]}'></div></div>
<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6253059d6caf5961927bd69d/bg3.jpg"><div class="t m0 x1 h4 y3 ff3 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h5 y4 ff4 fs2 fc0 sc0 ls0 ws0">微信搜索“<span class="ff5">AD<span class="_ _0"></span>I<span class="_ _1"> </span><span class="ff4">智库”，<span class="_ _0"></span>获取更多技术资<span class="_ _0"></span>料<span class="ff5"> <span class="_ _8"> </span>2 </span></span></span></div><div class="t m0 x9 hb y13 ff6 fs4 fc0 sc0 ls0 ws0">目录<span class="ff7"> </span></div><div class="t m0 x3 h8 y14 ff4 fs1 fc0 sc0 ls0 ws0">终结高速转换器带宽术语<span class="ff5"> <span class="_ _0"></span><span class="ls2">.............................................................................................<span class="ls0"> <span class="_ _9"></span>3<span class="fs2"> </span></span></span></span></div><div class="t m0 x3 h8 y15 ff4 fs1 fc0 sc0 ls0 ws0">高速转换器：内涵、原因和原理概述<span class="ff5"> <span class="ls2">...........................................................................</span> <span class="_ _9"></span>8<span class="fs2"> </span></span></div><div class="t m0 x3 h8 y16 ff4 fs1 fc0 sc0 ls0 ws0">高速差分<span class="_ _a"> </span><span class="ff5">ADC<span class="_ _a"> </span></span>驱动器设计指南<span class="ff5"> <span class="_ _b"></span><span class="ls2">...................................................................................<span class="ls0"> <span class="_ _c"></span>16<span class="fs2"> </span></span></span></span></div><div class="t m0 x3 h8 y17 ff4 fs1 fc0 sc0 ls0 ws0">高速放大器测试需要足够多的数学知识以使巴伦运转！<span class="ff5"> <span class="_ _d"></span><span class="ls2">.............................................<span class="ls3">44<span class="fs2 ls0"> </span></span></span></span></div><div class="t m0 x3 h8 y18 ff4 fs1 fc0 sc0 ls0 ws0">高速<span class="_ _a"> </span><span class="ff5">DAC<span class="_ _a"> </span></span>宽带输出网络知识与设计<span class="ff5"> <span class="_ _9"></span><span class="ls2">............................................................................<span class="ls0"> <span class="_ _d"></span><span class="ls4">52<span class="_ _c"></span><span class="fs2 ls0"> </span></span></span></span></span></div><div class="t m0 x3 h8 y19 ff4 fs1 fc0 sc0 ls0 ws0">高速<span class="_ _a"> </span><span class="ff5">ADC<span class="_ _a"> </span></span>的电源设计<span class="ff5"> <span class="_ _0"></span><span class="ls2">................................................................................................<span class="ls0">. <span class="_ _e"></span><span class="ls4">57<span class="fs2 ls0"> </span></span></span></span></span></div><div class="t m0 x3 h8 y1a ff4 fs1 fc0 sc0 ls0 ws0">低频和高频电路接地<span class="ff5"> <span class="ls2">..................................................................................................</span> <span class="_ _b"></span><span class="ls5">66<span class="fs2 ls0"> </span></span></span></div><div class="t m0 x3 h8 y1b ff4 fs1 fc0 sc0 ls0 ws0">了解<span class="_ _a"> </span><span class="ff5">JESD204B<span class="_ _a"> </span></span>规范的各层<span class="ff8 ls5">——</span><span class="ff5"> <span class="_ _f"> </span></span>从高速<span class="_ _a"> </span><span class="ff5">ADC<span class="_ _a"> </span></span>的角度出发<span class="ff5"> <span class="_ _c"></span><span class="ls2">...........................................</span> <span class="_ _b"></span><span class="ls6">74<span class="fs2 ls0"> </span></span></span></div><div class="t m0 x3 h8 y1c ff4 fs1 fc0 sc0 ls0 ws0">高速模数转换器精度透视<span class="ff5"> <span class="_ _0"></span><span class="ls2">...........................................................................................<span class="ls0"> <span class="_ _d"></span><span class="ls3">83<span class="fs2 ls0"> </span></span></span></span></span></div><div class="t m0 xa h8 y1d ff4 fs1 fc0 sc0 ls0 ws0">第一部分<span class="ff5"> <span class="_ _10"></span><span class="ls2">.............................................................................................................<span class="ls0"> <span class="_ _d"></span><span class="ls3">83<span class="fs2 ls0"> </span></span></span></span></span></div><div class="t m0 xa h8 y1e ff4 fs1 fc0 sc0 ls0 ws0">第二部分<span class="ff5"> <span class="_ _10"></span><span class="ls2">.............................................................................................................<span class="ls0"> <span class="_ _d"></span><span class="ls3">89<span class="fs2 ls0"> </span></span></span></span></span></div><div class="t m0 x3 h8 y1f ff4 fs1 fc0 sc0 ls0 ws0">高速<span class="_ _a"> </span><span class="ff5">ADC PCB<span class="_ _a"> </span></span>布局布线规则<span class="ff5"> <span class="ls2">....................................................................................</span> <span class="_ _c"></span>103<span class="fs2"> </span></span></div><div class="t m0 xa h8 y20 ff4 fs1 fc0 sc0 ls0 ws0">第一部分<span class="ff5"> <span class="_ _10"></span><span class="ls2">...........................................................................................................<span class="ls0"> <span class="_ _c"></span>103<span class="fs2"> </span></span></span></span></div><div class="t m0 xa h8 y21 ff4 fs1 fc0 sc0 ls0 ws0">第二部分<span class="ff5"> <span class="_ _10"></span><span class="ls2">...........................................................................................................<span class="ls0"> <span class="_ _c"></span>103<span class="fs2"> </span></span></span></span></div><div class="t m0 xa h8 y22 ff4 fs1 fc0 sc0 ls0 ws0">第三部分<span class="ff5"> <span class="_ _10"></span><span class="ls2">...........................................................................................................<span class="ls0"> 104<span class="fs2"> </span></span></span></span></div><div class="t m0 xa h8 y23 ff4 fs1 fc0 sc0 ls0 ws0">第四部分<span class="ff5"> <span class="_ _10"></span><span class="ls2">...........................................................................................................<span class="ls0"> <span class="_ _c"></span>105<span class="fs2"> </span></span></span></span></div><div class="t m0 x3 h8 y24 ff4 fs1 fc0 sc0 ls0 ws0">高速<span class="_ _a"> </span><span class="ff5">ADC PCB<span class="_ _a"> </span></span>布局布线技巧<span class="ff5"> <span class="ls2">....................................................................................</span> <span class="_ _c"></span>106<span class="fs2"> </span></span></div><div class="t m0 x3 h8 y25 ff5 fs1 fc0 sc0 ls0 ws0"> </div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return 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<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6253059d6caf5961927bd69d/bg4.jpg"><div class="t m0 x1 h4 y3 ff3 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h5 y4 ff4 fs2 fc0 sc0 ls0 ws0">微信搜索“<span class="ff5">AD<span class="_ _0"></span>I<span class="_ _1"> </span><span class="ff4">智库”，<span class="_ _0"></span>获取更多技术资<span class="_ _0"></span>料<span class="ff5"> <span class="_ _8"> </span>3 </span></span></span></div><div class="t m0 xb hc y5 ff6 fs3 fc0 sc0 ls0 ws0">终结高速转换器带宽术语<span class="ff7"> </span></div><div class="t m0 x3 h7 y6 ff4 fs1 fc0 sc0 ls0 ws0">有很多令人困惑的规格都与转换器带宽有关。<span class="_ _b"></span>为了在新的设计中选用适当的转换器，<span class="_ _e"></span>我</div><div class="t m0 x3 h8 y26 ff4 fs1 fc0 sc0 ls0 ws0">应当使用什么带宽术语呢？<span class="ff5"> </span></div><div class="t m0 x3 h7 y27 ff4 fs1 fc0 sc0 ls0 ws0">开始一个新设计时，<span class="_ _10"></span>需要决定的首要参数就是带宽。<span class="_ _10"></span>带宽为设计指明方向，<span class="_ _10"></span>引导设计人</div><div class="t m0 x3 h7 y28 ff4 fs1 fc0 sc0 ls0 ws0">员开辟通往成功之路。<span class="_ _10"></span>本质上有三类前端可供选择：<span class="_ _0"></span>基带型、<span class="_ _10"></span>带通或超奈奎斯特型<span class="_ _0"></span>（有</div><div class="t m0 x3 h8 y29 ff4 fs1 fc0 sc0 ls0 ws0">时也称为窄带或子采样型<span class="ff8 ls5">——</span>基本上不会用到第<span class="_ _1"> </span><span class="ff5">1<span class="_ _a"> </span></span>奈奎斯特区）<span class="_ _11"></span>以及宽带型，<span class="_ _11"></span>如图<span class="_ _1"> </span><span class="ff5">1<span class="_ _a"> </span></span>所示。</div><div class="t m0 x3 h8 y2a ff4 fs1 fc0 sc0 ls0 ws0">前端的选用取决于具体应用。<span class="ff5"> </span></div><div class="t m0 xc h8 y2b ff5 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 xd h8 y2c ff4 fs1 fc0 sc0 ls0 ws0">图<span class="_ _a"> </span><span class="ff5">1. <span class="_ _f"> </span></span>基带、带通与宽带，<span class="ff5">F</span></div><div class="t m0 xe hd y2d ff5 fs5 fc0 sc0 ls0 ws0">SAMPLE </div><div class="t m0 xf h8 y2c ff5 fs1 fc0 sc0 ls0 ws0">=200MSPS<span class="ff4">。</span> </div><div class="t m0 x3 h8 y2e ff4 fs1 fc0 sc0 ls0 ws0">基带设计要求的带宽是从直流（或低<span class="_ _12"> </span><span class="ff5">kHz/MHz<span class="_ _12"> </span></span>区）到转换器的奈奎斯特频率。用相对</div><div class="t m0 x3 h8 y2f ff4 fs1 fc0 sc0 ls0 ws0">带宽表示的话，<span class="_ _d"></span>这意味着大约<span class="_ _a"> </span><span class="ff5">10<span class="_ _c"></span>0MHz<span class="_ _1"> </span></span>或以下，<span class="_ _b"></span>假定采样速率为<span class="_ _a"> </span><span class="ff5">200MSPS</span>。<span class="_ _d"></span>这类设计可</div><div class="t m0 x3 h8 y30 ff4 fs1 fc0 sc0 ls0 ws0">以采用放大器或变压器<span class="ff5">/</span>巴伦。<span class="ff5"> </span></div><div class="t m0 x3 h7 y31 ff4 fs1 fc0 sc0 ls0 ws0">带通设计意味着在高中频时只会使用转换器带宽的一小部分（即小于奈奎斯特频率）。</div><div class="t m0 x3 h8 y32 ff4 fs1 fc0 sc0 ls0 ws0">例如，<span class="_ _3"></span>还是假定采样速率为<span class="_ _1"> </span><span class="ff5">200MSPS</span>，<span class="_ _3"></span>可能只需要<span class="_ _1"> </span><span class="ff5 ls7">20<span class="ls0">-60MHz<span class="_ _13"> </span></span></span>带宽，<span class="_ _14"></span>以<span class="_ _a"> </span><span class="ff5">170MHz<span class="_ _a"> </span></span>为中心。</div><div class="t m0 x3 h8 y33 ff4 fs1 fc0 sc0 ls0 ws0">不过，随着新一代<span class="_ _a"> </span><span class="ff5">GSPS<span class="_ _a"> </span></span>转换器类型产品的发布，市场呈现出向更高中频发展的趋势。</div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.611792,0.000000,0.000000,1.611792,0.000000,0.000000]}'></div></div>
<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6253059d6caf5961927bd69d/bg5.jpg"><div class="t m0 x1 h4 y3 ff3 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h5 y4 ff4 fs2 fc0 sc0 ls0 ws0">微信搜索“<span class="ff5">AD<span class="_ _0"></span>I<span class="_ _1"> </span><span class="ff4">智库”，<span class="_ _0"></span>获取更多技术资<span class="_ _0"></span>料<span class="ff5"> <span class="_ _8"> </span>4 </span></span></span></div><div class="t m0 x3 h8 y34 ff4 fs1 fc0 sc0 ls0 ws0">因此，上述示例中的数值可能会多填充一个<span class="_ _1"> </span><span class="ff5">0<span class="_ _c"></span></span>。本质上讲，<span class="_ _0"></span>设计人员只需利用转换器带</div><div class="t m0 x3 h7 y35 ff4 fs1 fc0 sc0 ls0 ws0">宽的一小部分就能完成工作。<span class="_ _10"></span>这种设计通常使用变压器或巴伦。<span class="_ _10"></span>不过，<span class="_ _10"></span>如果较高频率下</div><div class="t m0 x3 h8 y36 ff4 fs1 fc0 sc0 ls0 ws0">的动态性能足够并且需要增益，也可以使用放大器。<span class="ff5"> </span></div><div class="t m0 x3 h7 y37 ff4 fs1 fc0 sc0 ls0 ws0">宽带设计通常指需要全部带宽的设计。<span class="_ _e"></span>转换器能够提供多少带宽，<span class="_ _b"></span>用户就会使用多少带</div><div class="t m0 x3 h8 y38 ff4 fs1 fc0 sc0 ls0 ws0">宽<span class="ff8 ls5">——</span>供大于求！<span class="_ _0"></span>在三种设计中，<span class="_ _0"></span>这种设计的带宽最宽，<span class="_ _0"></span>因而是最具挑战性的前端设计。</div><div class="t m0 x3 h8 y39 ff4 fs1 fc0 sc0 ls0 ws0">如果设计要求整个通带的平坦度为<span class="_ _6"> </span><span class="ff5">0.1dB</span>，则更具挑战性。这类应用的带宽范围为直流</div><div class="t m0 x3 h8 y3a ff4 fs1 fc0 sc0 ls0 ws0">或低<span class="_ _a"> </span><span class="ff5">kHz/MHz<span class="_ _a"> </span></span>区至<span class="ff5">+GHz<span class="_ _a"> </span></span>区。此类设计常常采用宽带巴伦耦合到转换器。<span class="ff5"> </span></div><div class="t m0 x3 he y3b ff6 fs1 fc0 sc0 ls0 ws0">关于带宽的说明<span class="ff7"> </span></div><div class="t m0 x3 h7 y3c ff4 fs1 fc0 sc0 ls0 ws0">术语<span class="_ _10"></span>“带宽”<span class="_ _0"></span>在工程领域中遭到滥用，<span class="_ _10"></span>根据应用的不同，<span class="_ _0"></span>带宽的含义在不同设计人员看</div><div class="t m0 x3 h7 y3d ff4 fs1 fc0 sc0 ls0 ws0">来可能完全不同。<span class="_ _b"></span>在本文中，<span class="_ _e"></span>转换器的全功率带宽与转换器的可用带宽或采样带宽是不</div><div class="t m0 x3 h7 y3e ff4 fs1 fc0 sc0 ls0 ws0">同的。<span class="_ _b"></span>全功率带宽是转换器用于精确捕获信号以及内臵前端正确建<span class="_ _c"></span>立所需要的带宽。<span class="_ _b"></span>在</div><div class="t m0 x3 h7 y3f ff4 fs1 fc0 sc0 ls0 ws0">多数情况下，<span class="_ _b"></span>转换器的采样带宽目标是在大约两个奈奎斯特区拨入。<span class="_ _e"></span>转换器通常也是以</div><div class="t m0 x3 h8 y40 ff4 fs1 fc0 sc0 ls0 ws0">这种方式在其交流频率规格范围内进行表征。<span class="ff5"> </span></div><div class="t m0 x3 h7 y41 ff4 fs1 fc0 sc0 ls0 ws0">设计人员在转换器指定区域外选择中频并不是个明智的选择，<span class="_ _3"></span>因为系统的交流性能结果</div><div class="t m0 x3 h7 y24 ff4 fs1 fc0 sc0 ls0 ws0">会存在较大差异，<span class="_ _b"></span>尽管转换器数据手册中说明了额定分辨率和性能，<span class="_ _e"></span>或显示的全功率带</div><div class="t m0 x3 h7 y42 ff4 fs1 fc0 sc0 ls0 ws0">宽远大于转换器本身的采样带宽<span class="_ _10"></span>（可能是其两倍）<span class="_ _0"></span>。<span class="_ _10"></span>设计应围绕采样带宽展开。<span class="_ _0"></span>所有设</div><div class="t m0 x3 h7 y43 ff4 fs1 fc0 sc0 ls0 ws0">计<span class="_ _15"></span>都<span class="_ _15"></span>应<span class="_ _15"></span>当<span class="_ _15"></span>避<span class="_ _15"> </span>免<span class="_ _15"> </span>使<span class="_ _5"> </span>用<span class="_ _15"></span>额<span class="_ _15"></span>定<span class="_ _15"></span>全<span class="_ _15"></span>功<span class="_ _15"></span>率<span class="_ _15"></span>带<span class="_ _15"> </span>宽<span class="_ _15"> </span>的<span class="_ _5"> </span>某<span class="_ _15"></span>一<span class="_ _15"></span>或<span class="_ _15"></span>全<span class="_ _15"></span>部<span class="_ _15"></span>最<span class="_ _15"></span>高<span class="_ _15"> </span>频<span class="_ _15"> </span>率<span class="_ _5"> </span>部<span class="_ _15"></span>分<span class="_ _15"></span>，<span class="_ _15"></span>否<span class="_ _15"></span>则<span class="_ _15"></span>动<span class="_ _15"></span>态<span class="_ _15"> </span>性<span class="_ _15"> </span>能</div><div class="t m0 x3 h8 y44 ff5 fs1 fc0 sc0 ls0 ws0">(SNR/SFDR<span class="ls3">) <span class="_ _f"> </span></span><span class="ff4">会下降。为了确定<span class="_ _c"></span>高速模数转换器的采样<span class="_ _c"></span>带宽，请查阅数据手册<span class="_ _c"></span>，或者咨</span></div><div class="t m0 x3 h7 y45 ff4 fs1 fc0 sc0 ls0 ws0">询应用支持人员，<span class="_ _10"></span>因为有时候采样带宽并未明确给出。<span class="_ _10"></span>通常，<span class="_ _10"></span>数据手册会规定甚至列出</div><div class="t m0 x3 h7 y46 ff4 fs1 fc0 sc0 ls0 ws0">转换器采样带宽内经过生产测试、<span class="_ _10"></span>能够保证额定性能的频率。<span class="_ _10"></span>然而，<span class="_ _10"></span>需要对行业中的这</div><div class="t m0 x3 h8 y47 ff4 fs1 fc0 sc0 ls0 ws0">些带宽术语做出更好的说明和定义。<span class="ff5"> </span></div></div><div class="pi" data-data='{"ctm":[1.611792,0.000000,0.000000,1.611792,0.000000,0.000000]}'></div></div>
