无限增益多路负反馈型（MFB）二阶巴特沃斯低通滤波器Multisim仿真

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无限增益多路负反馈型（MFB）二阶巴特沃斯低通滤波器Multisim仿真 [复制链接]

#无限增益多路负反馈型（MFB）二阶巴特沃斯低通滤波器Multisim仿真 ##Multisim仿真电路搭建 根据上个帖子[无限增益多路负反馈型（MFB）二阶巴特沃斯低通滤波器参数转换 ](https://bbs.eeworld.com.cn/thread-1169878-1-1.html "无限增益多路负反馈型（MFB）二阶巴特沃斯低通滤波器参数转换 ")的计算参数，按照无限增益多路负反馈型（MFB）二阶巴特沃斯低通滤波器电路模型设计电路如下： <ignore_js_op> <img style="cursor:pointer;" id="aimg_545770" aid="545770" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202106/23/151129f4t98yx7f2iv3y2v.png" file="data/attachment/forum/202106/23/151129f4t98yx7f2iv3y2v.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_545770_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>1.png</strong> <em class="xg1">(27.79 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_545770" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=545770&handlekey=savephoto_545770">保存到相册</a> </p> <p class="xg1 y">2021-6-23 15:11 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> 波特图幅频曲线如下： <ignore_js_op> <img style="cursor:pointer;" id="aimg_545772" aid="545772" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202106/23/151346r3h44pww3j3kc34z.png" file="data/attachment/forum/202106/23/151346r3h44pww3j3kc34z.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_545772_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>2.png</strong> <em class="xg1">(44.46 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_545772" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=545772&handlekey=savephoto_545772">保存到相册</a> </p> <p class="xg1 y">2021-6-23 15:13 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> 根据仿真结果可以看出，由于我们需要的截止频率为30kHz，在仿真结果中的-3dB带宽处的频率7.5kHz,可见参数出现了偏差，因为在参数计算的过程中为了简化计算我们将电阻都理想的认为是相同的，所以我们再重新优化一下参数。  根据方程组公式1和公式3可知，令R1=R3=R； <ignore_js_op> <img style="cursor:pointer;" id="aimg_545819" aid="545819" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202106/23/161533f4kjh4ek1hlgkhkl.jpg" file="data/attachment/forum/202106/23/161533f4kjh4ek1hlgkhkl.jpg.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_545819_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>6.jpg</strong> <em class="xg1">(65.52 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_545819" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=545819&handlekey=savephoto_545819">保存到相册</a> </p> <p class="xg1 y">2021-6-23 16:15 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> 根据已经优化的参数，重新搭建Multisim仿真电路图： <ignore_js_op> <img style="cursor:pointer;" id="aimg_545820" aid="545820" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202106/23/161737d6s5yy5mddqvqmdp.png" file="data/attachment/forum/202106/23/161737d6s5yy5mddqvqmdp.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_545820_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>7.png</strong> <em class="xg1">(28.03 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_545820" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=545820&handlekey=savephoto_545820">保存到相册</a> </p> <p class="xg1 y">2021-6-23 16:17 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> 仿真结果如下： <ignore_js_op> <img style="cursor:pointer;" id="aimg_545821" aid="545821" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202106/23/161839fmxsm7cfcbvv3fpf.png" file="data/attachment/forum/202106/23/161839fmxsm7cfcbvv3fpf.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_545821_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>8.png</strong> <em class="xg1">(44.85 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_545821" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=545821&handlekey=savephoto_545821">保存到相册</a> </p> <p class="xg1 y">2021-6-23 16:18 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_545822" aid="545822" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202106/23/161914ieeh9yzym3lly9dz.png" file="data/attachment/forum/202106/23/161914ieeh9yzym3lly9dz.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_545822_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>9.png</strong> <em class="xg1">(44.7 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_545822" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=545822&handlekey=savephoto_545822">保存到相册</a> </p> <p class="xg1 y">2021-6-23 16:19 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> 符合技术要求。

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仿真工程如下，有需要的请下载，需要下载Multisim相应的软件。 batewosi.ms14 (1.5 MB, 下载次数: 23)

2021-6-23 16:22 上传

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讨论一下：刚刚又计算了这么一组数据，也是符合公式推导的，幅频曲线为何上翘了？？？？？？？

按照上述参数进行仿真如下：

结果如下：

minihang

厉害了