https://community.element14.com/technologies/wireless/w/documents/16831/pageen-USTelligent Community 12https://community.element14.com/technologies/wireless/w/documents/16831/pageFri, 08 Oct 2021 07:48:46 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6bfe6a09-955d-410a-bb92-0dbac38f8064Former Memberhttps://community.element14.com/technologies/wireless/w/documents/16831/page#commentsCurrent Revision posted to Documents by Former Member on 10/8/2021 7:48:46 AM<br /> <p style="margin:0;">来源:电子信息工程世界&nbsp; 作者:chactor</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">在频率较高的情况下（大于1GHz），LC巴伦由于电感，电容的寄生效应，自谐振频率等影响，性能将变差，而在高频上，用微带线设计的巴伦在性能，尺寸上都比较理想，本文讲解在较高频率上如何设计微带线巴伦并进行ADS仿真。</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;"></p><hr /><p style="margin:0;"></p><p style="margin:0;">微带巴伦的结果如下所示：</p><p style="margin:0;padding:0px;">&nbsp;</p><div><center><a href="http://www.eieworld.com/uploads/090807/1_112433_1.jpg" rel="nofollow ugc noopener" target="_blank"><img alt="image" border="0" height="91" src="http://www.eieworld.com/uploads/090807/1_112433_1.jpg" width="426" /></a><p style="margin:0;padding:0px;">&nbsp;</p></center></div><p style="margin:0;">微带线A的长度为0.5个波长，微带线B的长度为0.25个波长，波长为在实际基板上的信号波长，需要考虑基板的介电常数。</p><p style="margin:0;">巴伦的性能和所用的节数有关系，节数越多，频宽越宽，不过节数越多，尺寸也越大，上图为4节微带线巴伦。</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;"></p><hr /><p style="margin:0;"></p><p style="margin:0;">下面分别用ADS对一节，两节，三节微带线巴伦进行仿真。</p><p style="margin:0;"><strong>一节微带线巴伦：</strong></p><p style="margin:0;padding:0px;">&nbsp;</p><center><a href="http://www.eieworld.com/uploads/090807/1_113103_1.jpg" rel="nofollow ugc noopener" target="_blank"><img loading="lazy" alt="image" border="0" height="364" src="http://www.eieworld.com/uploads/090807/1_113103_1.jpg" width="576" /></a><p style="margin:0;padding:0px;">&nbsp;</p></center><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">仿真结果：</p><p style="margin:0;padding:0px;">&nbsp;</p><div><center><a href="http://www.eieworld.com/uploads/090807/1_113220_1.jpg" rel="nofollow ugc noopener" target="_blank"><img loading="lazy" alt="image" border="0" height="545" src="http://www.eieworld.com/uploads/090807/1_113220_1.jpg" width="405" /></a><p style="margin:0;padding:0px;">&nbsp;</p></center></div><p style="margin:0;">仿真结果可见相位在很大频宽内都保持180°正交，幅度在100MHz范围内基本两路平衡输出保持一致，插损在0.5dB左右。</p><p style="margin:0;"><strong>二节微带线巴伦：</strong></p><p style="margin:0;padding:0px;">&nbsp;</p><div><center><a href="http://www.eieworld.com/uploads/090807/1_113558_1.jpg" rel="nofollow ugc noopener" target="_blank"><img loading="lazy" alt="image" border="0" height="298" src="http://www.eieworld.com/uploads/090807/1_113558_1.jpg" width="642" /></a><p style="margin:0;padding:0px;">&nbsp;</p></center></div><p style="margin:0;">仿真结果：</p><p style="margin:0;padding:0px;">&nbsp;</p><div><center><a href="http://www.eieworld.com/uploads/090807/1_113721_1.jpg" rel="nofollow ugc noopener" target="_blank"><img loading="lazy" alt="image" border="0" height="546" src="http://www.eieworld.com/uploads/090807/1_113721_1.jpg" width="417" /></a><p style="margin:0;padding:0px;">&nbsp;</p></center></div><p style="margin:0;">仿真结果可见相位在很大频宽内都保持180°正交，幅度在200MHz范围内基本两路平衡输出保持一致，插损在0.5dB左右。</p><p style="margin:0;"><strong>三节微带线巴伦：</strong></p><p style="margin:0;padding:0px;">&nbsp;</p><div><center><a href="http://www.eieworld.com/uploads/090807/1_113932_1.jpg" rel="nofollow ugc noopener" target="_blank"><img loading="lazy" alt="image" border="0" height="237" src="http://www.eieworld.com/uploads/090807/1_113932_1.jpg" width="649" /></a><p style="margin:0;padding:0px;">&nbsp;</p></center></div><p style="margin:0;">仿真结果：</p><p style="margin:0;padding:0px;">&nbsp;</p><div><center><a href="http://www.eieworld.com/uploads/090807/1_114118_1.jpg" rel="nofollow ugc noopener" target="_blank"><img loading="lazy" alt="image" border="0" height="543" src="http://www.eieworld.com/uploads/090807/1_114118_1.jpg" width="405" /></a><p style="margin:0;padding:0px;">&nbsp;</p></center></div><p style="margin:0;">仿真结果可见相位在很大频宽内都保持180°正交，幅度在400MHz范围内基本两路平衡输出保持一致，插损在0.5dB左右。</p><p style="margin:0;">通过仿真发现巴伦节数越高，幅度平衡带宽越大，不过节数对插损基本影响不大。</p><br /><p style="margin:0;">该文档由下列讨论生成：微带巴伦设计与仿真</p><div style="clear:both;"></div>