{"id":1626,"date":"2018-12-03T06:47:21","date_gmt":"2018-12-03T06:47:21","guid":{"rendered":""},"modified":"2018-12-03T14:47:52","modified_gmt":"2018-12-03T06:47:52","slug":"%e8%af%a6%e7%bb%86%e8%a7%a3%e7%ad%94%e7%b2%be%e9%80%89pcb%e8%ae%be%e8%ae%a1%e4%b8%ad%e7%9a%84%e4%b9%9d%e4%b8%aa%e7%bb%8f%e5%85%b8%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=1626","title":{"rendered":"\u8be6\u7ec6\u89e3\u7b54\u7cbe\u9009PCB\u8bbe\u8ba1\u4e2d\u7684\u4e5d\u4e2a\u7ecf\u5178\u95ee\u9898"},"content":{"rendered":"

\n\t1\u3001\u6ee4\u6ce2\u65f6\u9009\u7528\u7535\u611f\uff0c\u7535\u5bb9<\/u>\u503c\u7684\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f<\/p>\n

\n\t\u7535\u611f\u503c\u7684\u9009\u7528\u9664\u4e86\u8003\u8651\u6240\u60f3\u6ee4\u6389\u7684\u566a\u58f0\u9891\u7387\u5916\uff0c\u8fd8\u8981\u8003\u8651\u77ac\u65f6\u7535\u6d41<\/u>\u7684\u53cd\u5e94\u80fd\u529b\u3002\u5982\u679cLC\u7684\u8f93\u51fa\u7aef\u4f1a\u6709\u673a\u4f1a\u9700\u8981\u77ac\u95f4\u8f93\u51fa\u5927\u7535\u6d41\uff0c\u5219\u7535\u611f\u503c\u592a\u5927\u4f1a\u963b\u788d\u6b64\u5927\u7535\u6d41\u6d41\u7ecf\u6b64\u7535\u611f\u7684\u901f\u5ea6\uff0c\u589e\u52a0\u7eb9\u6ce2\u566a\u58f0\u3002<\/p>\n

\n\t <\/div>\n

\n\t<\/p>\n

\n\t\u7535\u5bb9\u503c\u5219\u548c\u6240\u80fd\u5bb9\u5fcd\u7684\u7eb9\u6ce2\u566a\u58f0\u89c4\u8303\u503c\u7684\u5927\u5c0f\u6709\u5173\u3002\u7eb9\u6ce2\u566a\u58f0\u503c\u8981\u6c42\u8d8a\u5c0f\uff0c\u7535\u5bb9\u503c\u4f1a\u8f83\u5927\u3002\u800c\u7535\u5bb9\u7684ESR\/ESL\u4e5f\u4f1a\u6709\u5f71\u54cd\u3002\u53e6\u5916\uff0c\u5982\u679c\u8fd9LC\u662f\u653e\u5728\u5f00\u5173\u5f0f\u7535\u6e90)\u7684\u8f93\u51fa\u7aef\u65f6\uff0c\u8fd8\u8981\u6ce8\u610f\u6b64LC\u6240\u4ea7\u751f\u7684\u6781\u70b9\u96f6\u70b9\u5bf9\u8d1f\u53cd\u9988\u63a7\u5236\u56de\u8def\u7a33\u5b9a\u5ea6\u7684\u5f71\u54cd\u3002<\/p>\n

\n\t2\u3001\u6a21\u62df\u7535\u6e90\u5904\u7684\u6ee4\u6ce2\u7ecf\u5e38\u662f\u7528LC\u7535\u8def\u3002\u4f46\u662f\u4e3a\u4ec0\u4e48\u6709\u65f6LC\u6bd4RC\u6ee4\u6ce2\u6548\u679c\u5dee\uff1f<\/p>\n

\n\tLC\u4e0eRC\u6ee4\u6ce2\u6548\u679c\u7684\u6bd4\u8f83\u5fc5\u987b\u8003\u8651\u6240\u8981\u6ee4\u6389\u7684\u9891\u5e26\u4e0e\u7535\u611f\u503c\u7684\u9009\u62e9\u662f\u5426\u6070\u5f53\u3002\u56e0\u4e3a\u7535\u611f\u7684\u611f\u6297(reactance)\u5927\u5c0f\u4e0e\u7535\u611f\u503c\u548c\u9891\u7387\u6709\u5173\u3002\u5982\u679c\u7535\u6e90\u7684\u566a\u58f0\u9891\u7387\u8f83\u4f4e\uff0c\u800c\u7535\u611f\u503c\u53c8\u4e0d\u591f\u5927\uff0c\u8fd9\u65f6\u6ee4\u6ce2\u6548\u679c\u53ef\u80fd\u4e0d\u5982RC\u3002\u4f46\u662f\uff0c\u4f7f\u7528RC\u6ee4\u6ce2\u8981\u4ed8\u51fa\u7684\u4ee3\u4ef7\u662f\u7535\u963b\u672c\u8eab\u4f1a\u8017\u80fd\uff0c\u6548\u7387\u8f83\u5dee\uff0c\u4e14\u8981\u6ce8\u610f\u6240\u9009\u7535\u963b\u80fd\u627f\u53d7\u7684\u529f\u7387\u3002<\/p>\n

\n\t<\/p>\n

\n\t3\u3001\u5728\u7535\u8def\u677f\u5c3a\u5bf8\u56fa\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u8bbe\u8ba1\u4e2d\u9700\u8981\u5bb9\u7eb3\u66f4\u591a\u7684\u529f\u80fd\uff0c\u5c31\u5f80\u5f80\u9700\u8981\u63d0\u9ad8PCB\u7684\u8d70\u7ebf\u5bc6\u5ea6\uff0c\u4f46\u662f\u8fd9\u6837\u6709\u53ef\u80fd\u5bfc\u81f4\u8d70\u7ebf\u7684\u76f8\u4e92\u5e72\u6270\u589e\u5f3a\uff0c\u540c\u65f6\u8d70\u7ebf\u8fc7\u7ec6\u4e5f\u4f7f\u963b\u6297\u65e0\u6cd5\u964d\u4f4e\uff0c\u8bf7\u4ecb\u7ecd\u5728\u9ad8\u901f\uff08>100MHz\uff09\u9ad8\u5bc6\u5ea6PCB\u8bbe\u8ba1\u4e2d\u7684\u6280\u5de7?<\/p>\n

\n\t\u5728\u8bbe\u8ba1\u9ad8\u901f\u9ad8\u5bc6\u5ea6PCB\u65f6\uff0c\u4e32\u6270(crosstalk inte<\/u>rference)\u786e\u5b9e\u662f\u8981\u7279\u522b\u6ce8\u610f\u7684\uff0c\u56e0\u4e3a\u5b83\u5bf9\u65f6\u5e8f(ti<\/u>ming)\u4e0e\u4fe1\u53f7\u5b8c\u6574\u6027(signal integrity)\u6709\u5f88\u5927\u7684\u5f71\u54cd\u3002<\/p>\n

\n\t\u4ee5\u4e0b\u63d0\u4f9b\u51e0\u4e2a\u6ce8\u610f\u7684\u5730\u65b9\uff1a<\/p>\n

\n\t1). \u63a7\u5236\u8d70\u7ebf\u7279\u6027\u963b\u6297\u7684\u8fde\u7eed\u4e0e\u5339\u914d\u3002<\/p>\n

\n\t2). \u8d70\u7ebf\u95f4\u8ddd\u7684\u5927\u5c0f\u3002\u4e00\u822c\u5e38\u770b\u5230\u7684\u95f4\u8ddd\u4e3a\u4e24\u500d\u7ebf\u5bbd\u3002\u53ef\u4ee5\u900f\u8fc7\u4eff\u771f\u6765\u77e5\u9053\u8d70\u7ebf\u95f4\u8ddd\u5bf9\u65f6\u5e8f\u53ca\u4fe1\u53f7\u5b8c\u6574\u6027\u7684\u5f71\u54cd\uff0c\u627e\u51fa\u53ef\u5bb9\u5fcd\u7684\u6700\u5c0f\u95f4\u8ddd\u3002\u4e0d\u540c\u82af\u7247\u4fe1\u53f7\u7684\u7ed3\u679c\u53ef\u80fd\u4e0d\u540c\u3002<\/p>\n

\n\t3). \u9009\u62e9\u9002\u5f53\u7684\u7aef\u63a5\u65b9\u5f0f\u3002<\/p>\n

\n\t4). \u907f\u514d\u4e0a\u4e0b\u76f8\u90bb\u4e24\u5c42\u7684\u8d70\u7ebf\u65b9\u5411\u76f8\u540c\uff0c\u751a\u81f3\u6709\u8d70\u7ebf\u6b63\u597d\u4e0a\u4e0b\u91cd\u8fed\u5728\u4e00\u8d77\uff0c\u56e0\u4e3a\u8fd9\u79cd\u4e32\u6270\u6bd4\u540c\u5c42\u76f8\u90bb\u8d70\u7ebf\u7684\u60c5\u5f62\u8fd8\u5927\u3002<\/p>\n

\n\t5). \u5229\u7528\u76f2\u57cb\u5b54(blind\/buried via)\u6765\u589e\u52a0\u8d70\u7ebf\u9762\u79ef\u3002\u4f46\u662fPCB\u677f\u7684\u5236\u4f5c\u6210\u672c\u4f1a\u589e\u52a0\u3002<\/p>\n

\n\t\u5728\u5b9e\u9645\u6267\u884c\u65f6\u786e\u5b9e\u5f88\u96be\u8fbe\u5230\u5b8c\u5168\u5e73\u884c\u4e0e\u7b49\u957f\uff0c\u4e0d\u8fc7\u8fd8\u662f\u8981\u5c3d\u91cf\u505a\u5230\u3002\u9664\u6b64\u4ee5\u5916\uff0c\u53ef\u4ee5\u9884\u7559\u5dee\u5206\u7aef\u63a5\u548c\u5171\u6a21\u7aef\u63a5\uff0c\u4ee5\u7f13\u548c\u5bf9\u65f6\u5e8f\u4e0e\u4fe1\u53f7\u5b8c\u6574\u6027\u7684\u5f71\u54cd\u3002<\/p>\n

\n\t4\u3001\u5982\u4f55\u5c3d\u53ef\u80fd\u7684\u8fbe\u5230EMC<\/u>\u8981\u6c42\uff0c\u53c8\u4e0d\u81f4\u9020\u6210\u592a\u5927\u7684\u6210\u672c\u538b\u529b\uff1f<\/p>\n

\n\tPCB\u677f\u4e0a\u4f1a\u56e0EMC\u800c\u589e\u52a0\u7684\u6210\u672c\u901a\u5e38\u662f\u56e0\u589e\u52a0\u5730\u5c42\u6570\u76ee\u4ee5\u589e\u5f3a\u5c4f\u853d\u6548\u5e94\u53ca\u589e\u52a0\u4e86ferrite bead\u3001choke\u7b49\u6291\u5236\u9ad8\u9891\u8c10\u6ce2\u5668\u4ef6\u7684\u7f18\u6545\u3002<\/p>\n

\n\t\u9664\u6b64\u4e4b\u5916\uff0c\u901a\u5e38\u8fd8\u662f\u9700\u642d\u914d\u5176\u5b83\u673a\u6784\u4e0a\u7684\u5c4f\u853d\u7ed3\u6784\u624d\u80fd\u4f7f\u6574\u4e2a\u7cfb\u7edf\u901a\u8fc7EMC\u7684\u8981\u6c42\u3002\u4ee5\u4e0b\u4ec5\u5c31PCB\u677f\u7684\u8bbe\u8ba1\u6280\u5de7\u63d0\u4f9b\u51e0\u4e2a\u964d\u4f4e\u7535\u8def\u4ea7\u751f\u7684\u7535\u78c1\u8f90\u5c04\u6548\u5e94\u3002<\/p>\n

\n\t\u51e0\u4e2a\u964d\u4f4e\u7535\u8def\u4ea7\u751f\u7684\u7535\u78c1\u8f90\u5c04\u6548\u5e94<\/p>\n

\n\t1)\u3001\u5c3d\u53ef\u80fd\u9009\u7528\u4fe1\u53f7\u659c\u7387(slew rate)\u8f83\u6162\u7684\u5668\u4ef6\uff0c\u4ee5\u964d\u4f4e\u4fe1\u53f7\u6240\u4ea7\u751f\u7684\u9ad8\u9891\u6210\u5206\u3002<\/p>\n

\n\t2)\u3001\u6ce8\u610f\u9ad8\u9891\u5668\u4ef6\u6446\u653e\u7684\u4f4d\u7f6e\uff0c\u4e0d\u8981\u592a\u9760\u8fd1\u5bf9\u5916\u7684\u8fde\u63a5\u5668\u3002<\/p>\n

\n\t3)\u3001\u6ce8\u610f\u9ad8\u901f\u4fe1\u53f7\u7684\u963b\u6297\u5339\u914d\uff0c\u8d70\u7ebf\u5c42\u53ca\u5176\u56de\u6d41\u7535\u6d41\u8def\u5f84(return current path)\uff0c \u4ee5\u51cf\u5c11\u9ad8\u9891\u7684\u53cd\u5c04\u4e0e\u8f90\u5c04\u3002<\/p>\n

\n\t4)\u3001\u5728\u5404\u5668\u4ef6\u7684\u7535\u6e90\u7ba1\u811a\u653e\u7f6e\u8db3\u591f\u4e0e\u9002\u5f53\u7684\u53bb\u8026\u5408<\/u>\u7535\u5bb9\u4ee5\u7f13\u548c\u7535\u6e90\u5c42\u548c\u5730\u5c42\u4e0a\u7684\u566a\u58f0\u3002\u7279\u522b\u6ce8\u610f\u7535\u5bb9\u7684\u9891\u7387\u54cd\u5e94\u4e0e\u6e29\u5ea6\u7684\u7279\u6027\u662f\u5426\u7b26\u5408\u8bbe\u8ba1\u6240\u9700\u3002 5)\u3001\u5bf9\u5916\u7684\u8fde\u63a5\u5668\u9644\u8fd1\u7684\u5730\u53ef\u4e0e\u5730\u5c42\u505a\u9002\u5f53\u5206\u5272\uff0c\u5e76\u5c06\u8fde\u63a5\u5668\u7684\u5730\u5c31\u8fd1\u63a5\u5230chassis ground\u3002<\/p>\n

\n\t6)\u3001\u53ef\u9002\u5f53\u8fd0\u7528ground guard\/shunt traces\u5728\u4e00\u4e9b\u7279\u522b\u9ad8\u901f\u7684\u4fe1\u53f7\u65c1\u3002\u4f46\u8981\u6ce8\u610fguard\/shunt traces\u5bf9\u8d70\u7ebf\u7279\u6027\u963b\u6297\u7684\u5f71\u54cd\u3002<\/p>\n

\n\t7)\u3001\u7535\u6e90\u5c42\u6bd4\u5730\u5c42\u5185\u7f2920H\uff0cH\u4e3a\u7535\u6e90\u5c42\u4e0e\u5730\u5c42\u4e4b\u95f4\u7684\u8ddd\u79bb\u3002<\/p>\n

\n\t5\u3001\u5728\u9ad8\u901fPCB\u8bbe\u8ba1\u539f\u7406\u56fe\u8bbe\u8ba1\u65f6\uff0c\u5982\u4f55\u8003\u8651\u963b\u6297\u5339\u914d\u95ee\u9898\uff1f<\/p>\n

\n\t\u5728\u8bbe\u8ba1\u9ad8\u901fPCB\u7535\u8def\u65f6\uff0c\u963b\u6297\u5339\u914d\u662f\u8bbe\u8ba1\u7684\u8981\u7d20\u4e4b\u4e00\u3002\u800c\u963b\u6297\u503c\u8ddf\u8d70\u7ebf\u65b9\u5f0f\u6709\u7edd\u5bf9\u7684\u5173\u7cfb\uff0c \u4f8b\u5982\u662f\u8d70\u5728\u8868\u9762\u5c42(microstrip)\u6216\u5185\u5c42(stripline\/double stripline)\uff0c\u4e0e\u53c2\u8003\u5c42(\u7535\u6e90\u5c42\u6216\u5730\u5c42)\u7684\u8ddd\u79bb\uff0c\u8d70\u7ebf\u5bbd\u5ea6\uff0cPCB\u6750\u8d28\u7b49\u5747\u4f1a\u5f71\u54cd\u8d70\u7ebf\u7684\u7279\u6027\u963b\u6297\u503c\u3002<\/p>\n

\n\t<\/p>\n

\n\t\u5728\u8fd9\u91cc\u5c0f\u7f16\u4e00\u5b9a\u8981\u8bf4\u7684\u662f\u534e\u5f3aPCB\u5c31\u7279\u522b\u6ce8\u91cd\u963b\u6297\u677f\u7684\u751f\u4ea7\u8d44\u6599\u5904\u7406\u548c\u751f\u4ea7\u8fc7\u7a0b\u63a7\u5236\uff0c\u4ee5\u786e\u4fddPCB\u6210\u54c1\u80fd\u8fbe\u5230\u8bbe\u8ba1\u8005\u8981\u6c42\u7684\u963b\u6297\u503c\u3002<\/p>\n

\n\t6\u3001\u5728\u9ad8\u901fPCB\u8bbe\u8ba1\u65f6\uff0c\u8bbe\u8ba1\u8005\u5e94\u8be5\u4ece\u90a3\u4e9b\u65b9\u9762\u53bb\u8003\u8651EMC\u3001EMI\u7684\u89c4\u5219\u5462\uff1f<\/p>\n

\n\t\u4e00\u822cEMI\/EMC\u8bbe\u8ba1\u65f6\u9700\u8981\u540c\u65f6\u8003\u8651\u8f90\u5c04(radi<\/u>ated)\u4e0e\u4f20\u5bfc(conducted)\u4e24\u4e2a\u65b9\u9762. \u524d\u8005\u5f52\u5c5e\u4e8e\u9891\u7387\u8f83\u9ad8\u7684\u90e8\u5206(>30MHz)\u540e\u8005\u5219\u662f\u8f83\u4f4e\u9891\u7684\u90e8\u5206(<30MHz). \u6240\u4ee5\u4e0d\u80fd\u53ea\u6ce8\u610f\u9ad8\u9891\u800c\u5ffd\u7565\u4f4e\u9891\u7684\u90e8\u5206\u3002<\/p>\n

\n\t7\u3001\u54ea\u91cc\u80fd\u63d0\u4f9b\u6bd4\u8f83\u51c6\u786e\u7684IBIS\u6a21\u578b\u5e93\uff1f<\/p>\n

\n\tIBIS\u6a21\u578b\u7684\u51c6\u786e\u6027\u76f4\u63a5\u5f71\u54cd\u5230\u4eff\u771f\u7684\u7ed3\u679c\u3002\u57fa\u672c\u4e0aIBIS\u53ef\u770b\u6210\u662f\u5b9e\u9645\u82af\u7247I\/O buffer\u7b49\u6548\u7535\u8def\u7684\u7535\u6c14\u7279\u6027\u8d44\u6599\uff0c\u4e00\u822c\u53ef\u7531SPI<\/u>CE\u6a21\u578b\u8f6c\u6362\u800c\u5f97\uff0c\u800cSPICE\u7684\u8d44\u6599\u4e0e\u82af\u7247\u5236\u9020\u6709\u7edd\u5bf9\u7684\u5173\u7cfb\uff0c\u6240\u4ee5\u540c\u6837\u4e00\u4e2a\u5668\u4ef6\u4e0d\u540c\u82af\u7247\u5382\u5546\u63d0\u4f9b\uff0c\u5176SPICE\u7684\u8d44\u6599\u662f\u4e0d\u540c\u7684\uff0c\u8fdb\u800c\u8f6c\u6362\u540e\u7684IBIS\u6a21\u578b\u5185\u4e4b\u8d44\u6599\u4e5f\u4f1a\u968f\u4e4b\u800c\u5f02\u3002<\/p>\n

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