BLUE-ANT静电防护方案
<div class='showpostmsg'><p align="center"><a name="_Toc117168082"><b>BLUE-ANT</b></a><b>静电防护方案</b></p><p ><a name="_Toc117168091"><b>方案简介</b></a></p>
<p >无线天线是无线通信系统中不可或缺的组成部分,主要用于辐射和接受无线电波,天线种类按功能可分为接收天线和发射天线,接收天线用于捕获电磁波并将其转化为电信号,发射天线用于将电信号转化为电磁波辐射出去,有传输距离远,信号稳定等优点,适合远距离无线通信和信号覆盖,无线天线广泛应用于各种无线通信设备中,如手机通信,蓝牙通信,广播电视等。</p>
<p >本文主要介绍无线蓝牙耳机(TWS)中蓝牙接收天线静电防护方案,由于天线接口长期暴露在空气中,非常容易受到人体自带或外壳摩擦的ESD静电浪涌事件,静电浪涌容易以接收天线为媒介传递到PCB板,导致后端芯片的损坏,引起系统重启,死机等现象,给后续产品的稳定性与可靠性带来一定隐患。此方案采用封装体积小,响应速度快,结电容低的ESD做静电保护,确保接收到的电信号达到一定的强度,实现信号的有效接收和发送,在不影响数据传输的前提下满足IEC 61000-4-2 Level 4静电放电防护需求,让后端的电路得到有效全面的防护,使其适用于各种工业级产品。</p>
<p ><b>BLUE-ANT</b><b>的ESD防护</b></p>
<p >在构建蓝牙接收天线的ESD(静电放电)防护体系时需要充分考虑静电在底板的泄放路径,以确保静电能量不会经由天线线路进入无线模块内部,保证静电快速地通过所设计的泄放路径泄放到地。ESD防护在瞬态事件突发时,需凭借超低线间电容来维持电路安全,同时丝毫不减损信号的纯净度与完整性。遭遇ESD冲击时,电路承受的电压即等同于ESD防护器件的钳位电压,故确保钳位电压尽可能低。因此,理想的保护器件应兼具低ESD峰值钳位电压和低动态电阻的优越特性,以有效限制电压尖峰并减少能量损耗。所以,射频天线在选择ESD防护器件时需要考虑如下要求:</p>
<ol>
<li >低电容,防止产生谐波噪声使得无线模块的接收灵敏度降低;</li>
<li >经过若干次ESD冲击后,防护性能不退化且泄漏保持在较低水平;</li>
<li >器件封装尺寸小,PCB设计空间充足。</li>
</ol>
<p > </p>
<p ><a name="_Toc117168092"><b>应用示例</b></a><a name="_Toc117168093"></a></p>
<p align="center" > </p>
<p >SELC2F5V1B 和 SELC2F5V1BT是用于防止静电放电、低等级过压等瞬态事件的两款ESD防护器件,工作电压都为5V,最大峰值电流分别为4A和4.5A,器件均能满足IEC 61000-4-2 Level 4(±15kV空气放电、±8kV接触放电)静电防护标准及低等级雷击浪涌防护需求。客户可根据天线实际情况进行选择。</p>
<p ><b>型号参数</b></p>
<table align="center" style=" border-collapse:collapse; border:none" width="562">
<tbody>
<tr>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:1px solid black">
<p align="center" ><b>规格型号</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>方向</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>工作电压</b><b>(V)</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>Ppk(W)</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>IPP(A)</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>钳位电压</b><b>(V)</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>结电容(</b><b>pF</b><b>)</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>封装</b></p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p align="center" >SELC2F5V1B</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >Bi.</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >5</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >80</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >4</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >16</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >0.3</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >DFN1006- 2L</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p align="center" >SELC2F5V1BT</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >Bi.</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >5</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >120</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >4.5</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >22</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >0.25</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >DFN1006- 2L</p>
</td>
</tr>
</tbody>
</table>
<p ><b>电气特性表</b></p>
<p>At TA = 25℃ unless otherwise noted</p>
<table style=" border-collapse:collapse" width="100%">
<tbody>
<tr>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:1px solid black">
<p align="center" ><b>Parameter </b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p ><b>Symbol </b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p><b>Conditions </b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p ><b>Min. </b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p ><b>Typ. </b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p ><b>Max. </b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p><b>Units </b></p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Reverse Stand-off Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >VRWM</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p> </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >5.0</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p >Reverse Breakdown Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V<sub>BR</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>IT=1mA</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >6.0</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Reverse Leakage Current</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >I<sub>R</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>V<sub>RWM</sub>=5V</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >1.0</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >uA</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Clamping Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V<sub>C</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>I<sub>PP</sub>=1A; tp=8/20us</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p >10.0</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p >12.0</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Clamping Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V<sub>C</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>I<sub>PP</sub>=4A; tp=8/20us</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p >16.0</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p >20.0</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Junction Capacitance</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >C<sub>J</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>VR=0V; f=1MHz</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >0.3</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >0.4</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >pF</p>
</td>
</tr>
</tbody>
</table>
<p align="center" >表1 SELC2F5V1B电气特性表</p>
<table align="center" style=" border-collapse:collapse; border:none" width="100%">
<tbody>
<tr>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:1px solid black">
<p align="center" ><b>Parameter</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>Symbol</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>Conditions</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>Min.</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>Typ.</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>Max.</b></p>
</td>
<td style="border-bottom:1px solid black; background-color:#c71d31; border-top:1px solid black; border-right:1px solid black; border-left:none">
<p align="center" ><b>Units</b></p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Reverse Stand-off Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V<sub>RWM</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p> </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >5</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Reverse Breakdown Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V<sub>BR</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>IT=1mA</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >6.5</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Reverse Leakage Current</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >I<sub>R</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>V<sub>RWM</sub>=5V</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >1</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >uA</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Clamping Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V<sub>C</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>I<sub>PP</sub>=1A; tp=8/20us</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >12</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p>Clamping Voltage</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V<sub>C</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>I<sub>PP</sub>=4.5A; tp=8/20us</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >22</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >V</p>
</td>
</tr>
<tr>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:1px solid black">
<p >Junction Capacitance</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >C<sub>J</sub></p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p>VR=0V; f=1MHz</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >0.3</p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" > </p>
</td>
<td style="border-bottom:1px solid black; border-top:none; border-right:1px solid black; border-left:none">
<p align="center" >pF</p>
</td>
</tr>
</tbody>
</table>
<p align="center" >表2 SELC2F5V1BT电气特性表</p>
<p > </p>
<p ><b>总结与结论</b></p>
<p >由于蓝牙接收天线在通信领域中发挥着重要作用,保护IC免受ESD静电及浪涌损害极为关键。ELECSUPER SEMI研发各种低电容低钳位电压的ESD和TVS保护器件,可按照客户需求性能与封装提供定制化开发服务,为各种接口及通信线路提供值得信赖的保护器件。以上解决方案是保护接收天线的优选之策,确保在电子通信系统中电路能可靠传输和稳定运行。</p>
</div><script> var loginstr = '<div class="locked">查看本帖全部内容,请<a href="javascript:;" style="color:#e60000" class="loginf">登录</a>或者<a href="https://bbs.eeworld.com.cn/member.php?mod=register_eeworld.php&action=wechat" style="color:#e60000" target="_blank">注册</a></div>';
if(parseInt(discuz_uid)==0){
(function($){
var postHeight = getTextHeight(400);
$(".showpostmsg").html($(".showpostmsg").html());
$(".showpostmsg").after(loginstr);
$(".showpostmsg").css({height:postHeight,overflow:"hidden"});
})(jQuery);
} </script><script type="text/javascript">(function(d,c){var a=d.createElement("script"),m=d.getElementsByTagName("script"),eewurl="//counter.eeworld.com.cn/pv/count/";a.src=eewurl+c;m.parentNode.insertBefore(a,m)})(document,523)</script> <p>射频天线器件封装尺寸小,大概多大尺寸?</p>
页:
[1]