64 lines
8.5 KiB
Markdown
64 lines
8.5 KiB
Markdown
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---
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title: 复刻R300A
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updated: 2022-01-08 13:54:59Z
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created: 2022-01-08 13:18:07Z
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---
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
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<html>
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<head>
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<meta name="qrichtext" content="1" />
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<style type="text/css">
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p, li { white-space: pre-wrap; }
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</style>
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</head>
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<body style="font-family:'Tahoma'; font-size:10pt; font-weight:400; font-style:normal;">
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<ol style="margin: 0px; -qt-list-indent: 1;">
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<li style="font-family:'Consolas';" style="margin:0px;">结构方面尽量压缩厚度，单层最高内腔厚度以<span style=" background-color:#ffff00;">最高器件+2mm</span>为限，<span style=" text-decoration: line-through;">上盖板侧面为【土】和【山】型，即对外接口面无竖墙，其余面有竖墙</span></li>
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<li style="font-family:'Consolas';" style="margin:0px;">多加分腔，优化分腔大小（信号产生点，压缩空间）、长宽（信号传输线，抑制泄漏），分腔隔离带（<span style=" background-color:#ffff00;">Wmin=3mm</span>）中地孔孔径（<span style=" background-color:#ffff00;">2mm?</span>）最大化，保证可靠接地</li>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas';">分腔隔离带对应的隔离墙开槽（墙宽3mm，槽宽2mm）并填充导电泡棉保证隔离效果（参考</span><a href="nyf://entry?itemid=30&itemtext=G35DDC"><span style="font-family:'Consolas'; text-decoration: underline; color:#0000ff;">G35DDC</span></a><span style="font-family:'Consolas';"> 的设计）</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas';">PCB与盒体仅依靠隔离带共地接触，发热大户（DCDC、LDO、PLL）的位置亦需要共地接触（涂导热硅脂加速热传递）</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas';">隔离带采用全密闭设计，互联处射频线采用</span><span style="font-family:'Consolas'; background-color:#ffff00;">带状线1B1A</span><span style="font-family:'Consolas';">结构过渡</span></p>
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<li style="font-family:'Consolas';" style="margin:0px;">PCB采用全FR4，双面器件，顶层射频线，第二层全地保证射频地完整，三层控制线减小干扰，底层电源</li>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas';">器件挨着器件放置、减少射频线裸缆的长度，可直接降低信号损耗</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas';">射频信号由</span><span style="font-family:'Consolas'; background-color:#ffff00;">【微带线-带状线1BA-微带线】</span><span style="font-family:'Consolas';">的过渡需要仿真，最好能打板实测</span></p>
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<li style="font-family:'Consolas';" style="margin:0px;">进电升压选<span style="font-family:'Tahoma'; font-weight:600; color:#000000;">TPS63070</span><span style=" color:#000000;">，LDO选</span><span style="font-family:'Tahoma'; font-weight:600; color:#000000;">ADM7151</span><span style=" color:#000000;">，</span>分路磁珠选<span style="font-family:'Tahoma'; font-weight:600;">BLM18AG601SN1</span><span style=" color:#000000;">，开关P-MOS选用</span><span style="font-family:'Tahoma'; font-weight:600;">FDN340P</span><span style=" color:#000000;"> </span><a href="nyf://entry?itemid=28&itemtext=P"><span style="font-family:'Tahoma'; text-decoration: underline; color:#0000ff;">Pmos用法</span></a><span style="font-family:'Tahoma';"> </span><span style=" color:#000000;">，PLL选HMC835</span></li>
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</ol>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1; font-family:'Consolas'; color:#000000;"><br /></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1; font-family:'Consolas'; color:#000000;"><br /></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">预选滤波器独立成板</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">PLL可升级为LMX2572</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">射频开关换为PE42540E-Z，原HMC253A太贵</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">结构要精简，避免处处挖槽，处处凸出；避免异形槽、孔</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">线缆互连要合理，避免盲连</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">电源磁珠要足够</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">开关选用pmos，控制电平要明确，H（低压控制高压必须Z），L。考虑用Z代替H</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">控制线加滤波，善用</span><span style="font-family:'Arial-BoldMT'; font-size:9pt; font-weight:600; color:#000000;">74HCT2G04</span><span style="font-family:'Consolas'; color:#000000;">（TTL版）的反向器以减小控制线数量，电平兼容，同时简化控制逻辑、提升稳定性</span></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1; font-family:'Consolas'; color:#000000;"><br /></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">CPLD的速度可能远快于MCU</span></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1; font-family:'Consolas'; color:#000000;"><br /></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">2020.0904</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">预选滤波器独立成板，控制线采用普通fpc座或类似座，线可自制，拧线成束，</span></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style="font-family:'Consolas'; color:#000000;">预选滤波器采用振华富成品，性能、体积有保证</span></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1; font-family:'Consolas'; color:#000000;"><br /></p>
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<p style="margin:0px; -qt-block-indent:1;"><a href="nyf://entry?itemid=28&file=Pmos应用电路.png"><span style=" text-decoration: underline; color:#0000ff;">Pmos应用电路.png</span></a><a href="nyf://entry?itemid=28&file=Pmos应用电路.png"><span style=" text-decoration: underline; color:#0000ff;"> </span></a></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1;"><br /></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1;"><br /></p>
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<p style="margin:0px; -qt-block-indent:1;">0905</p>
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<p style="margin:0px; -qt-block-indent:1;"><span style=" font-size:16pt; font-weight:600; background-color:#ffff00;">测向相关</span></p>
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<p style="margin:0px; -qt-block-indent:1;">考虑到多模块同步后用于测向的场景及小型化、低功耗的需求，</p>
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<p style="margin:0px; -qt-block-indent:1;"><span style=" background-color:#ffff00;">方案一</span>，拟做专用的版本</p>
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<p style="margin:0px; -qt-block-indent:1;">此版本射频链路中无本振、无参考，无控制单元，裁剪部分提供外部接口用于受控，外部接口可级联</p>
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<p style="margin:0px; -qt-block-indent:1;">本振及控制单元抽立出来成为独立的模块，拟支持同步控制4路前端模块</p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1;"><br /></p>
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<p style="margin:0px; -qt-block-indent:1;"><span style=" background-color:#ffff00;">方案二</span>，硬件上采用完整的射频前端，功能上兼容独立工作和测向，测向时需要共参考且对各路本振进行同步，</p>
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<p style="margin:0px; -qt-block-indent:1;">据手册知，每次变频后都需要进行同步，同步时间待测，目测可能到数百us甚至数十ms级别，</p>
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<p style="margin:0px; -qt-block-indent:1;">考虑到 1，测向的频点不会快速跳变；2，测向是连续多次测量；3，测向会持续一段时间</p>
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<p style="margin:0px; -qt-block-indent:1;">此方案或许可行</p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1;"><br /></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1;"><br /></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1;"><br /></p>
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<p style="-qt-paragraph-type:empty; margin:0px; -qt-block-indent:1;"><br /></p>
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</body>
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</html>
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