HyperLynx High-Speed Circuit Design and Simulation (VII) Impedance Matching of Non-Ideal Transmission Line Differential Pairs

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HyperLynx High-Speed Circuit Design and Simulation (VII) Impedance Matching of Non-Ideal Transmission Line Differential Pairs [Copy link]

 

# HyperLynx High-speed Circuit Design and Simulation (VII) Impedance Matching of Non-ideal Transmission Line Differential Pairs##1. Reference Post###[HyperLynx High-speed Circuit Design and Simulation (VI) Eye Diagram of Non-ideal Transmission Line Differential Pairs (Impedance Mismatch)](https://en.eeworld.com/bbs/thread-1164798-1-1.html "HyperLynx High-speed Circuit Design and Simulation (VI) Eye Diagram of Non-ideal Transmission Line Differential Pairs (Impedance Mismatch)") ##2. π-type impedance matching of non-ideal transmission line differential pairs###1. Insert a π-type impedance matching network <ignore_js_op> <img style="cursor:pointer;" id="aimg_537177" aid="537177" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112851h239cz6xhxpk80hj.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112851h239cz6xhxpk80hj.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537177_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>3.png</strong> <em class="xg1">(58.12 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537177" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537177&handlekey=savephoto_537177">save to album</a> </p> <p class="xg1 y">2021-5-7 11:28 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_537178" aid="537178" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112852mzithch8pt4hto0h.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112852mzithch8pt4hto0h.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537178_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>4.png</strong> <em class="xg1">(45.78 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537178" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537178&handlekey=savephoto_537178">save to album</a> </p> <p class="xg1 y">2021-5-7 11:28 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###Calculate the resistance value of the inserted resistor based on the above principle <ignore_js_op> <img style="cursor:pointer;" id="aimg_537175" aid="537175" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112121li2rlzzrphh1cpiz.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112121li2rlzzrphh1cpiz.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537175_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>1.png</strong> <em class="xg1">(22.94 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537175" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537175&handlekey=savephoto_537175">save to album</a> </p> <p class="xg1 y">2021-5-7 11:21 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###2. Open the simulation results <ignore_js_op> <img style="cursor:pointer;" id="aimg_537176" aid="537176" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112428t7yon6nnzdnmnvnx.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/112428t7yon6nnzdnmnvnx.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537176_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>2.png</strong> <em class="xg1">(98.8 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537176" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537176&handlekey=savephoto_537176">save to album</a> </p> <p class="xg1 y">2021-5-7 11:24 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###After π-type matching, it is found that the eye diagram effect has improved. ##3. Non-ideal transmission line differential pair T-type impedance matching###1. Insert T-type impedance matching network <ignore_js_op> <img style="cursor:pointer;" id="aimg_537179" aid="537179" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113351nxj99ap9mac39n0c.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113351nxj99ap9mac39n0c.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537179_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>a.png</strong> <em class="xg1">(39.31 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537179" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537179&handlekey=savephoto_537179">save to album</a> </p> <p class="xg1 y">2021-5-7 11:33 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_537180" aid="537180" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113351rvlop31tvclmlmtl.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113351rvlop31tvclmlmtl.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537180_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>b.png</strong> <em class="xg1">(52.11 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537180" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537180&handlekey=savephoto_537180">save to album</a> </p> <p class="xg1 y">2021-5-7 11:33 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_537181" aid="537181" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113800bemnpppve8xfvpse.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113800bemnpppve8xfvpse.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537181_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>11.png</strong> <em class="xg1">(23.71 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537181" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537181&handlekey=savephoto_537181">save to album</a> </p> <p class="xg1 y">2021-5-7 11:38 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###2. Simulation diagram <ignore_js_op> <img style="cursor:pointer;" id="aimg_537182" aid="537182" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113914uklkflk3z33l3k67.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/07/113914uklkflk3z33l3k67.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537182_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>57.png</strong> <em class="xg1">(98.4 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_537182" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537182&handlekey=savephoto_537182">save to album</a> </p> <p class="xg1 y">2021-5-7 11:39 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###After TxiT-type matching, it is found that the eye diagram effect has improved.

火辣西米秀

The structure in the simulation diagram is the legendary eye diagram.

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Hot Ximi Show published on 2021-5-8 13:42 The structure in the simulation diagram is the legendary eye diagram

Yes, it is an eye diagram. The bigger and rounder the eye is, the better the signal effect is.