admin 发表于 2019-9-11 16:39:25

过孔寄生电容计算器

<table cellpadding="0" cellspacing="0" class="vwtb"><tbody><tr><td id="article_content"><script type="text/javascript">
//过孔寄生电容
function parasitic_cap_calc()
{
        var d1 = document.getElementById("input1_d1").value*document.getElementById("input1_d1_unit").value;
        var d2 = document.getElementById("input1_d2").value*document.getElementById("input1_d2_unit").value;
    var h = document.getElementById("input1_h").value*document.getElementById("input1_h_unit").value;
    var er = document.getElementById("input1_er").value
    var C= 1.41*er*h*d1/(d2-d1)
    if(d2>d1)
      document.getElementById("input1_c").value= C.toPrecision(4);               
    else
      document.getElementById("input1_c").value= "Err:d2<d1";
}
</script>

<table class="gridtable">
      <tbody><tr>
<th colspan="4" class="apphot">过孔寄生电容计算器
</th>
</tr>
<tr>
<td>焊盘直径(d1):</td>
<td>
    <input id="input1_d1" onkeyup="parasitic_cap_calc()" value="20" name="input1_d1" type="text">
</td>
<td>
    <select id="input1_d1_unit" onchange="parasitic_cap_calc()" name="input1_d1_unit">
      <option value="0.03937">mm</option>
      <option value="0.001" selected="">mil</option>
      </select>
</td>
<td rowspan="6"><div align="center"><p><img src="/template/rtj1009_010/image/jisuan/gkjsdr.png" data-bd-imgshare-binded="1"></p></div></td>
    </tr>
<tr>
<td>隔离盘直径(d2):</td>
<td>
    <input id="input1_d2" onkeyup="parasitic_cap_calc()" value="32" name="input1_d2" type="text">
</td>
<td>
    <select id="input1_d2_unit" onchange="parasitic_cap_calc()" name="input1_d2_unit">
      <option value="0.03937">mm</option>
      <option value="0.001" selected="">mil</option>
      </select>
</td>
</tr>
<tr>
<td>板厚(h):</td>
<td>
    <input name="input1_h" id="input1_h" onkeyup="parasitic_cap_calc()" value="50" type="text">
</td>
<td>
    <select id="input1_h_unit" onchange="parasitic_cap_calc()" name="input1_h_unit">
      <option value="0.03937">mm</option>
      <option value="0.001" selected="">mil</option>
      </select>
</td>
</tr>
<tr>
<td>介电常数(er):</td>
<td>
    <input name="input1_er" id="input1_er" onkeyup="parasitic_cap_calc()" value="4.3" type="text">
</td>
<td>&nbsp;</td>
</tr>
<tr>
      </tr><tr>
<td>寄生电容(c):</td>
<td>
    <input name="input1_c" class="eda_input_res" id="input1_c" onkeyup="parasitic_cap_calc()" value="0.5053" type="text">
</td>
<td>pF</td>
</tr>
<tr>
<td colspan="4">说明:以上计算结果仅供参考</td>
</tr>
                  
    </tbody></table></td></tr></tbody></table>

l224 发表于 2020-9-23 10:41:21

好工具，谢谢！

皮大王 发表于 2022-10-12 20:49:17

好工具，感谢老师的分享谢谢凡亿的老师！
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