HyperLynx High-Speed Circuit Design and Simulation (IX) Research on Single-Line Differential Line of Four-Layer Board Stacking Structure

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HyperLynx High-Speed Circuit Design and Simulation (IX) Research on Single-Line Differential Line of Four-Layer Board Stacking Structure [Copy link]

 

# HyperLynx High-speed Circuit Design and Simulation (IX) Exploration of Single-line Differential Line of Four-layer Board Stacking Structure##1. Four-layer Board Stacking Structure###For the commonly used 4-layer board, there are the following stacking methods (from top to bottom). ###(1) Siganl_1 (Top), GND (Inner_1), POWER (Inner_2), Siganl_2 (Bottom). <ignore_js_op> <img style="cursor:pointer;" id="aimg_537586" aid="537586" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/211519b1ke11ccpdkxxnnh.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/211519b1ke11ccpdkxxnnh.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537586_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>1.png</strong> <em class="xg1">(13.46 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_537586" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537586&handlekey=savephoto_537586">save to album</a> </p> <p class="xg1 y">2021-5-10 21:15 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###(2) Siganl_1 (Top), POWER (Inner_1), GND (Inner_2), Siganl_2 (Bottom). <ignore_js_op> <img style="cursor:pointer;" id="aimg_537587" aid="537587" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/211604f1hkfkf2zylycyum.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/211604f1hkfkf2zylycyum.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537587_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>2.png</strong> <em class="xg1">(13.24 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_537587" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537587&handlekey=savephoto_537587">save to album</a> </p> <p class="xg1 y">2021-5-10 21:16 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###(3) POWER (Top), Siganl_1 (Inner_1), GND (Inner_2), Siganl_2 (Bottom). <ignore_js_op> <img style="cursor:pointer;" id="aimg_537588" aid="537588" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/211649fbhwmodokdcymdyc.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/211649fbhwmodokdcymdyc.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537588_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>3.png</strong> <em class="xg1">(12.25 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_537588" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537588&handlekey=savephoto_537588">save to album</a> </p> <p class="xg1 y">2021-5-10 21:16 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ##2. Impedance and line width, line spacing, different signal layers and other parameters of single line on four-layer board###1. Single line model construction <ignore_js_op> <img style="cursor:pointer;" id="aimg_537592" aid="537592" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213323zji91ff1f31ql97f.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213323zji91ff1f31ql97f.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537592_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>11.png</strong> <em class="xg1">(6.4 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_537592" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537592&handlekey=savephoto_537592">save to album</a> </p> <p class="xg1 y">2021-5-10 21:33 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###2. Results <ignore_js_op> <img style="cursor:pointer;" id="aimg_537593" aid="537593" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213634x8gs4aalzxi4ae4e.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213634x8gs4aalzxi4ae4e.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537593_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>14.png</strong> <em class="xg1">(44.14 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_537593" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537593&handlekey=savephoto_537593">save to album</a> </p> <p class="xg1 y">2021-5-10 21:36 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_537594" aid="537594" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213811bt3q95c3l6hls9uq.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213811bt3q95c3l6hls9uq.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537594_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>15.png</strong> <em class="xg1">(44.35 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_537594" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537594&handlekey=savephoto_537594">save to album</a> </p> <p class="xg1 y">2021-5-10 21:38 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_537595" aid="537595" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213826zhpduxqqld8f7yp7.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/213826zhpduxqqld8f7yp7.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537595_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>16.png</strong> <em class="xg1">(43.54 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_537595" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537595&handlekey=savephoto_537595">save to album</a> </p> <p class="xg1 y">2021-5-10 21:38 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ##3. Impedance and line width, line spacing, different signal layers and other parameters of differential line on four-layer board###1. Differential line model construction <ignore_js_op> <img style="cursor:pointer;" id="aimg_537589" aid="537589" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/212051vc3htsg3tlgelz6t.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/212051vc3htsg3tlgelz6t.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537589_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>4.png</strong> <em class="xg1">(7.26 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_537589" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537589&handlekey=savephoto_537589">save to album</a> </p> <p class="xg1 y">2021-5-10 21:20 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###2. Results <ignore_js_op> <img style="cursor:pointer;" id="aimg_537590" aid="537590" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/212212b3fwsxw0rw31nyit.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/212212b3fwsxw0rw31nyit.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537590_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>5.png</strong> <em class="xg1">(46.06 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_537590" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537590&handlekey=savephoto_537590">save to album</a> </p> <p class="xg1 y">2021-5-10 21:22 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_537591" aid="537591" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/212304ubusszqnmbml3nsu.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202105/10/212304ubusszqnmbml3nsu.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_537591_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>6.png</strong> <em class="xg1">(45.89 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_537591" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=537591&handlekey=savephoto_537591">save to album</a> </p> <p class="xg1 y">2021-5-10 21:23 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ##Conclusion###Scheme 3 The power layer and the ground layer lack effective coupling and should not be adopted. So how should scheme 1 and scheme 2 be? Generally, scheme 1 will be selected as the structure of the 4-layer board. The reason for the selection is not that Option 2 cannot be adopted, but that general PCB boards only place components on the top layer, so Option 1 is more appropriate. ###However, when components need to be placed on both the top and bottom layers, and the dielectric thickness between the internal power layer and the ground layer is large, and the coupling is poor, it is necessary to consider which layer has fewer signal lines. For Option 1, there are fewer signal lines on the bottom layer, and a large area of copper film can be used to couple with the POWER layer; on the contrary, if the components are mainly arranged on the bottom layer, Option 2 should be used to make the board. If a stacked structure is used, the power layer and the ground layer are already coupled. Considering the requirements of symmetry, Option 1 is generally used.

Jacktang

Yes, the general solution 1 is this Siganl_1 (Top), GND (Inner_1), POWER (Inner_2), Siganl_2 (Bottom)

bqgup

Jacktang posted on 2021-5-10 22:43 Yes, the general solution 1 is this Siganl_1 (Top), GND (Inner_1), POWER (Inner_2), Siganl_2 (Bottom)

It is a conventional option

bqgup

bqgup posted on 2021-5-11 17:53 It is the conventional option

The advantages of this structure can also be seen from the simulation data.