<p><strong>1. 什么是MIPI D-PHY</strong></p>
<p>MIPI D-PHY是移动设备等内部用于和显示器、摄像头收发信号的I/F规格。</p>
<p>在Ver.2中，D-PHY已实现每个通道最高为4.5Gbps的通信速度。随着智能手机等移动设备的像素的增加，该技术可满足对于视频数据增加的需求。</p>
<p>除D-PHY之外，还有可实现每个通道最高为6Gbps的通信速度的C-PHY。</p>
<p><a href="https://www.murata.com/zh-cn/products/emc/emifil/pickup/mipic-phy">有关C-…，请参照此处</a>。</p>
<p><img alt="MIPI D-PHY静噪" data-entity-type="file" data-entity-uuid="3d16681c-8de8-4cfd-8730-4771854c4e78" src="/sites/default/files/inline-images/1_111.png" /></p>
<p>用途（LCD-CPU, Camera-CPU）</p>
<p><img alt="用途（LCD-CPU, Camera-CPU）" data-entity-type="file" data-entity-uuid="f7ef7de4-77a9-499e-b4ef-4036909a4478" src="/sites/default/files/inline-images/MIPID-PHY_img0002.png" /></p>
<p><strong>2. MIPI D-PHY的噪声问题</strong></p>
<p>从主板和模块之间的MIPI D-PHY布线通过的数字信号从FPC电缆中放射出来，与无线电路的天线耦合，从而可能降低天线接收灵敏度。因此需除去通过MIPI D-PHY布线的噪声。</p>
<p><img alt="MIPI D-PHY布线" data-entity-type="file" data-entity-uuid="2be7522f-6f4e-4daf-9f3e-3c73ba3da4bd" src="/sites/default/files/inline-images/MIPID-PHY_img0003.png" /></p>
<p><strong>3. MIPI D-PHY的静噪措施</strong></p>
<p>在主板的I/F部分插入噪声滤波器，控制传播至FPC电缆的噪声。</p>
<p><img alt="MIPI D-PHY的静噪措施" data-entity-type="file" data-entity-uuid="bdb95d74-36e6-4462-bf4b-9ba5c8c90718" src="/sites/default/files/inline-images/MIPID-PHY_img0004_0.png" /></p>
<p><strong>4. MIPI D-PHY的静噪注意事项</strong></p>
<p>以往的I/F静噪案例</p>
<p>以往的I/F为差分传输模式或单端模式</p>
<p><img alt="5" data-entity-type="file" data-entity-uuid="b58fb08f-cce0-4fa5-8450-36cf15e705a0" src="/sites/default/files/inline-images/5_2.PNG" /></p>
<p><strong>5. 适用于MIPI D-PHY静噪的噪声滤波器</strong></p>
<p>建议在MIPI D-PHY v2.0中使用以下共模扼流圈/噪声滤波器。这些产品对差分/单端两种信号产生的干扰较小，有助于降低共模噪声。</p>
<table border="1">
<thead>
<tr>
<th bgcolor="#E6E6E6" rowspan="2">Part Number</th>
<th bgcolor="#E6E6E6" rowspan="2">搜索<br />
库存</th>
<th bgcolor="#E6E6E6" rowspan="2">Size<br />
[mm]</th>
<th bgcolor="#E6E6E6" colspan="4">有效带宽</th>
</tr>
<tr>
<th bgcolor="#E6E6E6">700M-900MHz<br />
LTE/GSM</th>
<th bgcolor="#E6E6E6">1.5GHz-2.6GHz<br />
LTE/GSM</th>
<th bgcolor="#E6E6E6">2.4GHz<br />
Wifi/BT</th>
<th bgcolor="#E6E6E6">3.5GHz<br />
LTE</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLM0QSN500HY2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLM0QSN500HY2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td>0605</td>
<td>○</td>
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<td> </td>
</tr>
<tr>
<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLM0NSN500HY2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLM0NSN500HY2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td>0806</td>
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<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLP11SA900HL2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLP11SA900HL2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td rowspan="2">1210</td>
<td>○</td>
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<td> </td>
</tr>
<tr>
<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLP11TB800UL2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLP11TB800UL2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td>○</td>
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</tr>
</tbody>
</table>
<p><img alt="5" data-entity-type="file" data-entity-uuid="c9df40bf-c33e-459d-92b6-c773790bf5b8" src="/sites/default/files/inline-images/MIPID-PHY_img0005.png" /></p>
<p><strong>6. 静噪效果的确认示例</strong></p>
<p><strong><img alt="静噪效果的确认示例" data-entity-type="file" data-entity-uuid="a905e76e-f1ec-4a0d-b52d-f02cf74cb375" src="/sites/default/files/inline-images/MIPID-PHY_img0006_2.png" /></strong></p>
<p>上述实验证实使用DLM0QSN500HY2可有效抑制LTE Low-Band High-Band、Wifi 2.4GHz宽频带下与天线耦合的噪声。</p>
<p><strong>7. 对差分信号波形的影响的确认示例（使用DLM0QSN500HY2）</strong></p>
<p><img alt="对差分信号波形的影响的确认示例" data-entity-type="file" data-entity-uuid="c41d49ab-9f4f-4171-8230-87c19889c20c" src="/sites/default/files/inline-images/MIPID-PHY_img0007_2.png" /></p>
<p>即使插入滤波器，也没有对信号波形造成不良影响。</p>
<p><strong>8. 总结</strong></p>
<p>在移动设备中，用于连接显示器和摄像头的MIPI D-PHY接口产生噪声，该噪声与设备自身的天线耦合，从而可能降低天线灵敏度。该问题的有效解决措施是在I/F出口使用共模扼流圈/噪声滤波器。</p>
<p>由于MIPI D-PHY中同时存在差分信号与单端信号，因此应注意选择不会干扰信号波形的部件。</p>
<p>建议使用以下介绍的共模扼流圈/噪声滤波器。</p>
<p><strong>建议使用的MIPI D-PHY静噪滤波器</strong></p>
<table border="1">
<thead>
<tr>
<th bgcolor="#E5E5E5" rowspan="2">Part Number</th>
<th bgcolor="#E5E5E5" rowspan="2">搜索<br />
库存</th>
<th bgcolor="#E5E5E5" rowspan="2">Size<br />
[mm]</th>
<th bgcolor="#E5E5E5" colspan="4">有效带宽</th>
</tr>
<tr>
<th bgcolor="#E5E5E5">700M-900MHz<br />
LTE/GSM</th>
<th bgcolor="#E5E5E5">1.5GHz-2.6GHz<br />
LTE/GSM</th>
<th bgcolor="#E5E5E5">2.4GHz<br />
Wifi/BT</th>
<th bgcolor="#E5E5E5">3.5GHz<br />
LTE</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLM0QSN500HY2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLM0QSN500HY2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td>0605</td>
<td>○</td>
<td>○</td>
<td>○</td>
<td> </td>
</tr>
<tr>
<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLM0NSN500HY2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLM0NSN500HY2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td>0806</td>
<td>○</td>
<td>○</td>
<td>○</td>
<td>○</td>
</tr>
<tr>
<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLP11SA900HL2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLP11SA900HL2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td rowspan="2">1210</td>
<td>○</td>
<td>○</td>
<td>○</td>
<td> </td>
</tr>
<tr>
<td><a href="https://www.murata.com/zh-cn/products/productdetail?cate=luNoiseSupprFi…; target="_blank">DLP11TB800UL2</a></td>
<td><a href="https://www.murata.com/zh-cn/support/stock?partnumber1=DLP11TB800UL2&qu…; target="_blank"><img src="https://www.murata.com/-/media/webrenewal/commons/main-img0045.ashx?la=…; /></a></td>
<td>○</td>
<td>○</td>
<td>○</td>
<td>○</td>
</tr>
</tbody>
</table>
<p>参考文章：</p>
<ul>
<li><a href="https://www.murata.com/zh-cn/products/emc/emifil/pickup/mipic-phy">MIPI C-PHY的静噪措施</a></li>
<li><a href="https://www.murata.com/-/media/webrenewal/products/emc/emifil/cmcc/pdf/…;用于MIPI C-PHY的共模扼流圈/噪声滤波器的选择图表</a></li>
</ul>