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class="authi"><a href="http://club.oecr.com/space-uid-98180.html" target="_blank" class="xw1" style="color: #0033CC">cherryfalls</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo596245" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo596245_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-98180.html" target="_blank" class="xi2" style="color: #0033CC">cherryfalls</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=98180&do=profile" target="_blank" class="xi2">54</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=98180&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=cherryfalls" id="a_showip_li_596245" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=cherryfalls" id="a_repent_596245" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-98180.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=98180&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <div id="fj" class="y"> <label class="z">电梯直达</label> <input type="text" class="px p_fre z" size="2" onkeyup="$('fj_btn').href='forum.php?mod=redirect&ptid=93334&authorid=0&postno='+this.value" onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-93334-1-1.html" id="postnum596245" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon596245" src="static/image/common/online_member.gif" /> <em id="authorposton596245">发表于 2009-9-23 22:34:40</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=93334&page=1&authorid=98180" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=93334&extra=&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 596245);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_596245"> 最近可能需要购买快光电管，但是厂商给出的参数里面没有动态范围和输出幅度，请问根据下面已有数据能得到嘛，计算思路是怎么样的，非常感谢。<br /> <br /> rise time: <30ps<br /> bandwidth: >10GHz<br /> spectral range: 300~900nm<br /> quantum efficiency: 40%<br /> sensity area: 0.2*0.2mm<br /> noise eq. power: 10^(-15)<br /> dark current: 0.1nA<br /> material: GaAs<br /> 灵敏度：0.3 A/W<br /> 损伤阈值：5~50mW</td></tr></table> </div> <div id="comment_596245" class="cm"> </div> <div id="post_rate_div_596245"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=93334&formhash=6d701e55" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" title="收藏本帖"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span 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<td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta1" id="post_596412" ><table id="pid596412" class="plhin" summary="pid596412" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar596412" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-1876.html" target="_blank" class="xw1" style="color: #FF99FF">dnke</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo596412" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo596412_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-1876.html" target="_blank" class="xi2" style="color: #FF99FF">dnke</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=1876&do=profile" target="_blank" class="xi2">1335</a></dd> </dl><div class="imicn"> <a 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href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=93334&pid=596412" id="postnum596412" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>2</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon596412" src="static/image/common/online_member.gif" /> <em id="authorposton596412">发表于 2009-9-24 15:01:38</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=93334&page=1&authorid=1876" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_596412"> 动态范围和输出范围和你的前放是有关系的，噪声可用来计算最小可探功率，1mW左右的输入光功率可作为饱和功率，算算看吧。</td></tr></table> </div> <div id="comment_596412" class="cm"> </div> <div id="post_rate_div_596412"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition596412"></tr> <tr> <td class="pls"></td> <td 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#0033CC">cherryfalls</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo596539" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo596539_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-98180.html" target="_blank" class="xi2" style="color: #0033CC">cherryfalls</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=98180&do=profile" target="_blank" class="xi2">54</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=98180&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=cherryfalls" id="a_showip_li_596539" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=cherryfalls" id="a_repent_596539" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-98180.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=98180&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=93334&pid=596539" id="postnum596539" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>3</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon596539" src="static/image/common/ico_lz.png" /> 楼主<span class="pipe">|</span> <em id="authorposton596539">发表于 2009-9-24 23:09:17</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=93334&page=1&authorid=98180" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_596539"> <strong><a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=596412&ptid=93334" target="_blank">2#</a> <i>dnke</i> </strong><br /> 谢谢，那就拿我发的参数来说：<br /> NEP是3*10^(-15) watts per (<a href="http://en.wikipedia.org/wiki/Hertz" target="_blank"><font color="#0000ff">hertz</font></a>)1/2，用这个做为最小可探测功率，就是3fW；<br /> 饱和功率1mW；<br /> 这样的话，就有9个数量级，是不是太大了啊<br /> <br /> 另外，对光电二极管来说，前放是PN或者PIN的偏置电压那部分东西吗？</td></tr></table> </div> <div id="comment_596539" class="cm"> </div> <div id="post_rate_div_596539"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition596539"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div 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href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=93334&page=1&authorid=98180" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_597790"> 下面是厂家的回复，我想进一步问的是，文中提到电池噪声是1E-5，这个值是如何决定动态范围的。非常感谢。<br /> <br /> It is defined as the ratio of the maximum current amplitude (15 mA) to the dark current. <br /> 15 (mA) / 100(pA) = 150E+6, that is 150 millions. <br /> It is a huge dynamic range. However, the limitation in this case will be limited NOT by the dynamic range of the photodiode itself, but by the noise properties of the POWER SUPPLY. Therefore, we recommend to use very low noise power supplies. The best solution is using a battery, or rechargeable battery. They have very low level of noise, probably 1E-5 or so,. 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