这个问题有些笼统。一般您需要根据实际要求确定电路功能，然后进行元器件选型。接着确定电路。最后优化电路。如果您有什么具体要做的可以联系我，我给你出方案，或者具体的参考电路。

回复：【DCDC电源的外围电路选型？】 | 问答

2017-12-18 仁杰

<p> 可以，你可以定义好协议。收发的协议。一个发的，两个收的。比如协议层可以这样定义： </p> <p> <br /> </p> <p> <p class="MsoNormal" style="color:#141414;font-family:'Helvetica Neue', Helvetica, Tahoma, Arial, sans-serif;font-size:14px;background-color:#FBFBFB;"> a.<span>主机发送：&nbsp;</span><span>0XFF+0XFE+0XFD+0XFC+SN(</span><span>通过</span><span>8</span><span>位拨码开关选择，如</span><span>0x01)+</span><span>命令（</span><span>DATA1-DATA30)+0XFC+0XFD+0XFE+0XFF</span> </p> <p class="MsoNormal" style="color:#141414;font-family:'Helvetica Neue', Helvetica, Tahoma, Arial, sans-serif;font-size:14px;background-color:#FBFBFB;"> &nbsp; </p> <p class="MsoNormal" style="color:#141414;font-family:'Helvetica Neue', Helvetica, Tahoma, Arial, sans-serif;font-size:14px;background-color:#FBFBFB;"> b.<span>从机返回：&nbsp;</span><span>0XFF+0XFE+0XFD+0XFC+SN(</span><span>通过</span><span>8</span><span>位拨码开关选择，如</span><span>0x01)+</span><span>从机状态（如</span><span>0x01</span><span>）</span><span>+0XFC+0XFD+0XFE+0XFF</span> </p> </p>

回复：【两个速率不同的从机可以挂载到同一个I2C总线吗？】 | 问答

2017-12-18 仁杰

【数字频率合成模块（原理图+PCB）可直接打样】 | 论坛

2017-12-18 仁杰

[图片]

回复：【调幅调频模块（原理图+PCB）】 | 论坛

2017-12-18 仁杰

<p class="MsoNormal" style="text-align:left;text-indent:24pt;"> <span style="font-size:18px;"><strong>主要芯片介绍：</strong></span> </p> <p class="MsoNormal" style="text-indent:24.0000pt;"> <span style="font-size:16px;"><strong>1.AD835</strong></span><span style="font-size:16px;"><strong>芯片的性能</strong></span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">±</span><span style="font-size:16px;">5V</span><span style="font-size:16px;">供电；</span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">AD835</span><span style="font-size:16px;">的芯片内部包含有</span><span style="font-size:16px;">X</span><span style="font-size:16px;">和</span><span style="font-size:16px;">Y</span><span style="font-size:16px;">差分输入放大器、求和器和输出缓冲放大器</span><span style="font-size:16px;">；</span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">X ,Y</span><span style="font-size:16px;">输入信号范围</span><span style="font-size:16px;">-1V</span><span style="font-size:16px;">～</span><span style="font-size:16px;">+1 V；</span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">带宽</span><span style="font-size:16px;">250MHz；</span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">输出电压范围为</span><span style="font-size:16px;">-2.5</span><span style="font-size:16px;">～</span><span style="font-size:16px;">+2</span><span style="font-size:16px;">.5 V。</span> </p> <p class="MsoNormal" style="text-indent:21.0000pt;"> <span style="font-size:16px;"><strong>2.HEF4046B</strong></span><span style="font-size:16px;"><strong>芯片的性能</strong></span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">单</span><span style="font-size:16px;">5V</span><span style="font-size:16px;">供电；</span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">输入电压范围</span><span style="font-size:16px;">-0.5V~VDD+0.5V</span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">VCO</span><span style="font-size:16px;">线性度：</span><span style="font-size:16px;">&lt;1%(</span><span style="font-size:16px;">电源电压</span><span style="font-size:16px;">10V</span><span style="font-size:16px;">条件</span><span style="font-size:16px;">)</span><span style="font-size:16px;">；</span> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><span style="font-size:16px;">Ø&nbsp;</span><!--[endif]--><span style="font-size:16px;">工作频率最高</span><span style="font-size:16px;">1.4MHz</span><span style="font-size:16px;">（</span><span style="font-size:16px;">VDD=10V,R1=5k</span><span style="font-size:16px;">）</span> </p>

回复：【调幅调频模块（原理图+PCB）】 | 论坛

2017-12-18 仁杰

【调幅调频模块（原理图+PCB）】 | 论坛

2017-12-18 仁杰

<p> <strong><span style="font-size:18px;">我说一下</span></strong><span style="line-height:1.5;font-size:18px;"><strong>&nbsp;</strong></span><b><span style="font-size:18px;">增益控制部分：</span></b> </p> <p> <b><span style="font-size:18px;"> <p class="MsoNormal" style="text-indent:21pt;"> <span style="font-size:16px;">增益控制部分选用可控增益放大器</span><span style="font-size:16px;">AD603</span><span style="font-size:16px;">。内部结构详见</span><span style="font-size:16px;">AD603</span><span style="font-size:16px;">资料，它由增益控制界面，精确衰减器和固定增益放大器组成。</span> </p> <p class="MsoNormal"> <span style="font-size:16px;">当</span><span style="font-size:16px;">AD603</span><span style="font-size:16px;">的</span><span style="font-size:16px;">5</span><span style="font-size:16px;">脚与</span><span style="font-size:16px;">7</span><span style="font-size:16px;">脚在短接情况下，固定增益放大倍数为</span> </p> <p class="MsoNormal"> <span style="font-size:16px;">Au=1+694/20=36</span> </p> <p class="MsoNormal"> <span style="font-size:16px;">整个</span><span style="font-size:16px;">AD603</span><span style="font-size:16px;">的增益为</span><span style="font-size:16px;">40Ug+10,</span><span style="font-size:16px;">当</span><span style="font-size:16px;">Ug</span><span style="font-size:16px;">在</span><span style="font-size:16px;">-0.5</span><span style="font-size:16px;">到</span><span style="font-size:16px;">+0.5</span><span style="font-size:16px;">变化时，增益控制在</span><span style="font-size:16px;">-10</span><span style="font-size:16px;">到</span><span style="font-size:16px;">30DB.</span><span style="font-size:16px;">为了扩大增益，选用两级放大。同时由于</span><span style="font-size:16px;">AD603</span><span style="font-size:16px;">的输入电阻只有</span><span style="font-size:16px;">100</span><span style="font-size:16px;">欧，为了增大输入电阻，加入高速低噪声电压反馈运放</span><span style="font-size:16px;">OPA642</span><span style="font-size:16px;">做前级隔离和缓冲，在输入端同时加上</span><span style="font-size:16px;">1/10</span><span style="font-size:16px;">衰减电路。</span><span style="font-size:16px;">OPA642</span><span style="font-size:16px;">的增益带宽积为</span><span style="font-size:16px;">400MHZ</span><span style="font-size:16px;">，在一倍放大情况下，足够放大通用的频率。级间耦合采用钽电容并联高频电容的方法，兼顾高频和低频。</span> </p> </span></b> </p> <h4> <b></b> </h4>

回复：【宽带放大器模块（原理图+PCB）可直接打样】 | 论坛

2017-12-18 仁杰

<strong><span style="font-size:18px;">接口说明</span></strong><br /> <table class="MsoNormalTable" style="width:408.1pt;"> <tbody> <tr> <td width="179" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">输入接口</span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> <td width="183" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">输出接口</span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> <td width="181" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">电源接口</span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> </tr> <tr> <td width="179" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">信号输入</span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> <td width="183" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">RC_OUT1:<span>信号</span><span>1</span><span>输出</span></span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> <td width="181" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">+12V</span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> </tr> <tr> <td width="179" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">&nbsp;</span> </p> </td> <td width="183" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">RC_OUT2:<span>信号</span><span>2</span><span>输出</span></span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> <td width="181" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">-12V</span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> </tr> <tr> <td width="179" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">&nbsp;</span> </p> </td> <td width="183" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">&nbsp;</span> </p> </td> <td width="181" valign="top" style="border:1.0000pt solid windowtext;"> <p class="MsoNormal"> <span style="font-family:宋体;font-size:10.5pt;">GND</span><span style="font-family:宋体;font-size:10.5pt;"></span> </p> </td> </tr> </tbody> </table> <br />

回复：【移项电路模块（原理图+PCB）可直接打样】 | 论坛

2017-12-18 仁杰

【移项电路模块（原理图+PCB）可直接打样】 | 论坛

2017-12-18 仁杰

<p> <strong><span style="background-color:#E53333;"><span style="background-color:#FFFFFF;">忽略1楼的补充说明，此贴改为了</span><span style="color:#666666;font-family:Tahoma, 'Microsoft Yahei', Simsun;font-size:16px;font-weight:600;line-height:24px;background-color:#FFFFFF;"><span style="background-color:#FFFFFF;">&nbsp;</span><span style="background-color:#E53333;">宽带放大器模块</span></span><span style="background-color:#E53333;"></span></span></strong> </p> <p> <strong><span style="background-color:#FFFFFF;">其主要芯片</span></strong><span style="line-height:1.5;">AD603</span><b>芯片的性能</b><strong>介绍如下：</strong> </p> <p> <strong><span style="background-color:#FFFFFF;"></span></strong> </p> <p class="MsoNormal" style="text-indent:24.0000pt;"> <strong><br /> </strong> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><strong>Ø&nbsp;<!--[endif]-->双电源供电<span>：</span>±5V<span>；</span></strong> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><strong>Ø&nbsp;<!--[endif]--><span>输入信号幅度</span>VINP<span>：</span><span>+2V</span><span>；</span></strong> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><strong>Ø&nbsp;<!--[endif]--><span>压摆率为</span>275V/μs；</strong> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><strong>Ø&nbsp;<!--[endif]--><span>增益在</span>-11<span>～</span><span>+30dB</span><span>时的带宽为</span><span>90Mhz</span><span>，增益在</span><span>+9</span><span>～</span><span>+41dB</span><span>时具有</span><span>9MHz</span><span>带宽</span>；</strong> </p> <p class="MsoNormal" style="margin-left:36pt;text-indent:-18pt;"> <!--[if !supportLists]--><strong>Ø&nbsp;<!--[endif]--><span>增益变化范围可分三种模式进行控制</span>。</strong> </p> <strong><br /> </strong> <p> <br /> </p>

回复：【宽带放大器模块（原理图+PCB）可直接打样】 | 论坛

2017-12-18 仁杰