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onclick="setCopy('http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=8057', '链接已经复制到剪贴板');" type="submit"> <em>复制链接推荐给好友</em></button> <input type="text" class="px vm" onclick="this.select();setCopy(this.value, '链接已经复制到剪贴板');" value="http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=8057" size="50" /></p> </div> <div class="bm"> <div class="bm_c xld"> <b>弱信号检测讨论，附图:</b><div class="postmsg">假设APD产生的光电流是10nA，输入的光信号是光脉冲信号，我现在要将器转化为输出为3.3V的脉冲电压，不知道这个电路可行否，如果不行，存在什么问题，有没有更好的，更简单的方法实现，请各位大峡予指导！</div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>这么复杂？！</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>为什么APD要加上150V的高压？这个根本就不能工作。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>简单的电路是，去掉第一级，APD的正接地、负接2脚，2M反馈电阻改为330M即可。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>另外，运放要改成低偏流的，AD707的1nA太大了，同时低漂移的特性根本无用。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>最后，可以单电源供电，只要运放合适就可以，比如单端CMOS输入/FET输入的/轨-轨的。</P></div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>因为规格书上APD的工作电压为150V-200V，并且光生电流是有范围的，从10nA到20uA，而我需要的是始终输出的是3.3V的脉冲电压，如何实现？</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>另外，这么大的放大倍率，一及放大电路可否完成。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>请大虾指教！</P></div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>150V是APD的偏压，如果直接接地的话，可能没法驱动APD，另外第一及是前置放大，第二及是主放大，很多疑问啊没办法弄明白</P></div> <div style="height200px;"></div> </div> </div> </div> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a 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