{"id":20130,"date":"2022-02-19T10:55:03","date_gmt":"2022-02-19T02:55:03","guid":{"rendered":"https:\/\/www.paiqinano.com\/?p=20130"},"modified":"2024-06-18T16:09:42","modified_gmt":"2024-06-18T08:09:42","slug":"pcb%e8%ae%be%e8%ae%a1%e5%8d%81%e9%97%ae%e5%8d%81%e7%ad%94","status":"publish","type":"post","link":"https:\/\/www.paiqinano.com\/?p=20130","title":{"rendered":"PCB\u8bbe\u8ba1\u5341\u95ee\u5341\u7b54"},"content":{"rendered":"

1\u3001\u8fc7\u6ee4\u65f6\u91c7\u7528\u7535\u611f\u5668<\/u>\uff0c\u7535\u5bb9\u5668<\/u>\u503c\u7684\u65b9\u5f0f\u6709\u54ea\u4e9b\uff1f<\/strong><\/p>\n

\u7535\u611f\u5668\u503c\u7684\u91c7\u7528\u9664\u5f00\u8003\u8651\u5230\u6240\u611f\u6ee4\u9664\u7684\u566a\u97f3\u5de5\u4f5c\u9891\u7387\u5916\uff0c\u8fd8\u9700\u8981\u8003\u8651\u5230\u77ac\u95f4\u7535\u6d41\u91cf<\/u>\u7684\u53cd\u5e94\u80fd\u529b\u3002\u5047\u5982LC\u7684\u5bfc\u51fa\u7aef\u4f1a\u8fd8\u6709\u673a\u4f1a\u5fc5\u987b\u4e00\u77ac\u95f4\u5bfc\u51fa\u5927\u7535\u6d41\u91cf\uff0c\u5219\u7535\u611f\u5668\u503c\u592a\u4ea4\u6d41\u4f1a\u963b\u62e6\u6b64\u5927\u7535\u6d41\u91cf\u6d41\u8fc7\u6b64\u7535\u611f\u5668\u7684\u901f\u7387\uff0c\u63d0\u5347\u8c10\u6ce2\u5931\u771f\u566a\u97f3(ripple noise)\u3002 \u7535\u5bb9\u5668\u503c\u5219\u548c\u80fd\u591f\u5305\u5bb9\u7684\u8c10\u6ce2\u5931\u771f\u566a\u97f3\u6807\u51c6\u503c\u7684\u5c3a\u5bf8\u76f8\u5173\u3002\u8c10\u6ce2\u5931\u771f\u566a\u97f3\u503c\u89c4\u5b9a\u8d8a\u5c0f\uff0c\u7535\u5bb9\u5668\u503c\u7528\u6bd4\u8f83\u5927\u3002\u800c\u7535\u5bb9\u5668\u7684ESR\/ESL\u4e5f\u4f1a\u51fa\u73b0\u5371\u5bb3\u3002<\/p>\n

\u6b64\u5916\uff0c\u5047\u5982\u8fd9LC\u662f\u653e\u5230\u7535\u6e90\u5f00\u5173<\/u>\u5f0f\u5f00\u5173\u7535\u6e90(switching regulation power)\u7684\u5bfc\u51fa\u7aef\u65f6\uff0c\u8fd8\u9700\u8981\u7559\u610f\u6b64LC\u6240\u5f62\u6210\u7684\u9876\u70b9\u96f6\u70b9(pole\/zero)\u5bf9\u8d1f\u53cd\u9988\u64cd\u7eb5(negative feedback control)\u63a7\u5236\u56de\u8def\u7a33\u5b9a\u6027\u7684\u5371\u5bb3\u3002<\/p>\n

2\u3001\u4eff\u771f\u6a21\u62df\u5f00\u5173\u7535\u6e90\u5904\u7684\u8fc7\u6ee4\u5e38\u5e38\u662f\u7528LC\u7535\u6e90\u7535\u8def<\/u>\u3002\u53ef\u662f\u4e3a\u4f55\u6709\u65f6\u5019LC\u6bd4RC\u8fc7\u6ee4\u5b9e\u9645\u6548\u679c\u5dee\uff1f<\/strong><\/p>\n

LC\u4e0eRC\u8fc7\u6ee4\u5b9e\u9645\u6548\u679c\u7684\u8f83\u4e3a\u52a1\u5fc5\u8003\u8651\u5230\u6240\u8981\u6ee4\u9664\u7684\u9891\u6bb5\u4e0e\u7535\u611f\u5668\u503c\u7684\u9009\u53d6\u662f\u4e0d\u662f\u9002\u5f53\u3002\u7531\u4e8e\u7535\u611f\u5668\u7684\u611f\u6297(reactance)\u5c3a\u5bf8\u4e0e\u7535\u611f\u5668\u503c\u548c\u5de5\u4f5c\u9891\u7387\u76f8\u5173\u3002\u5047\u5982\u5f00\u5173\u7535\u6e90\u7684\u566a\u97f3\u5de5\u4f5c\u9891\u7387\u8f83\u4f4e\uff0c\u800c\u7535\u611f\u5668\u503c\u53c8\u4e0d\u8db3\u5927\uff0c\u8fd9\u65f6\u8fc7\u6ee4\u5b9e\u9645\u6548\u679c\u5f88\u6709\u53ef\u80fd\u6bd4\u4e0d\u4e0aRC\u3002\u53ef\u662f\uff0c\u5e94\u7528RC\u8fc7\u6ee4\u8981\u6295\u5165\u7684\u7ed3\u679c\u662f\u7535\u963b\u5668<\/u>\u81ea\u8eab\u4f1a\u80fd\u8017\uff0c\u9ad8\u6548\u7387\u8f83\u5f31\uff0c\u4e14\u8981\u7559\u610f\u9009\u5b9a\u7535\u963b\u5668\u80fd\u627f\u62c5\u7684\u8f93\u51fa\u529f\u7387\u3002<\/p>\n

3\u3001\u5728\u7ebf\u8def\u677f\u89c4\u683c\u56fa\u5b9a\u4e0d\u52a8\u7684\u60c5\u5f62\u4e0b\uff0c\u5047\u5982\u8bbe\u8ba1\u65b9\u6848\u4e2d\u5fc5\u987b\u627f\u8f7d\u5927\u91cf\u7684\u4f5c\u7528\uff0c\u5c31\u5fc5\u7136\u5fc5\u987b\u63d0\u5347PCB<\/u>\u7684\u8d70\u7ebf\u5bc6\u5ea6\uff0c\u53ef\u662f\u90a3\u6837\u6709\u53ef\u80fd\u9020\u6210\u5e03\u7ebf\u7684\u4e92\u76f8\u5f71\u54cd\u63d0\u9ad8\uff0c\u4e0e\u6b64\u540c\u65f6\u5e03\u7ebf\u8f83\u7ec6\u4e5f\u4f7f\u7279\u6027\u963b\u6297<\/u>\u6ca1\u6cd5\u51cf\u5c11\uff0c\u8bf7\u8be6\u7ec6\u4ecb\u7ecd\u5728\u5feb\u901f\uff08>100MHz\uff09\u5bc6\u5ea6\u9ad8\u7684PCB\u8bbe\u8ba1<\/u>\u4e2d\u7684\u65b9\u6cd5?<\/strong><\/p>\n

\u5728\u8bbe\u8ba1\u65b9\u6848\u5feb\u901f\u5bc6\u5ea6\u9ad8\u7684PCB\u65f6\uff0c\u4e32\u6270(crosstalk interference)\u7684\u786e\u662f\u8981\u975e\u5e38\u6ce8\u610f\u7684\uff0c\u56e0\u4e3a\u5b83\u5bf9\u65f6\u949f\u9891\u7387(ti<\/u>mi<\/u>ng)\u4e0e\u4fe1\u53f7\u5b8c\u6574\u6027(signal integrity)\u6709\u8f83\u5927\u7684\u5371\u5bb3\u3002\u4e0b\u5217\u7ed9\u4e88\u597d\u591a\u4e2a\u7559\u610f\u7684\u5730\u533a\uff1a<\/p>\n

1)\u64cd\u7eb5\u5e03\u7ebf\u7279\u6027\u963b\u6297\u7684\u6301\u7eed\u4e0e\u914d\u5bf9\u3002<\/p>\n

2)\u5e03\u7ebf\u95f4\u9694\u7684\u5c3a\u5bf8\u3002\u4e00\u822c\u968f\u5904\u53ef\u89c1\u7684\u95f4\u9694\u4e3a\u4e8c\u500d\u7ebf\u8ddd<\/u>\u3002\u53ef\u4ee5\u901a\u8fc7\u6a21\u62df\u4eff\u771f\u6765\u4e86\u89e3\u5e03\u7ebf\u95f4\u9694\u5bf9\u65f6\u949f\u9891\u7387\u53ca\u4fe1\u53f7\u5b8c\u6574\u6027\u7684\u5371\u5bb3\uff0c\u627e\u5230\u53ef\u5bb9\u5fcd\u7684\u6700\u5c11\u95f4\u9694\u3002\u4e0d\u4e00\u6837\u96c6\u6210ic\u6570\u636e\u4fe1\u53f7\u7684\u7d50\u679c\u5f88\u6709\u53ef\u80fd\u4e0d\u4e00\u6837\u3002<\/p>\n

3)\u6311\u9009\u5408\u7406\u7684\u7ebf\u63a5\u65b9\u6cd5\u3002<\/p>\n

4)\u9632\u6b62\u5de6\u53f3\u90bb\u8fd1\u4ea4\u53e0\u7684\u5e03\u7ebf\u65b9\u4f4d\u540c\u6837\uff0c\u4e43\u81f3\u6709\u5e03\u7ebf\u6070\u597d\u5de6\u53f3\u91cd\u8fed\u5728\u4e00\u8d77\uff0c\u7531\u4e8e\u8fd9\u7c7b\u4e32\u6270\u6bd4\u540c\u5c42\u90bb\u8fd1\u5e03\u7ebf\u7684\u60c5\u51b5\u8fd8\u5927\u3002<\/p>\n

5)\u8fd0\u7528\u76f2\u57cb\u5b54(blind\/buried via<\/u>)\u6765\u63d0\u5347\u5e03\u7ebf\u603b\u9762\u79ef\u3002\u53ef\u662fPCB\u677f<\/u>\u7684\u5236\u9020\u6210\u672c\u8d39\u4f1a\u63d0\u5347\u3002<\/p>\n

\u5728\u5177\u4f53\u5b9e\u884c\u65f6\u7684\u786e\u96be\u4ee5\u505a\u5230\u5f7b\u5e95\u5e73\u884c\u9762\u4e0e\u7b49\u957f\uff0c\u4f46\u662f\u4f9d\u7136\u8981\u5c3d\u53ef\u80fd\u4fdd\u8bc1\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u53ef\u4ee5\u9884\u57cb\u5dee\u5206\u4fe1\u53f7\u7ebf\u63a5\u548c\u5171\u6a21\u7ebf\u63a5\uff0c\u4ee5\u7f13\u89e3\u5bf9\u65f6\u949f\u9891\u7387\u4e0e\u4fe1\u53f7\u5b8c\u6574\u6027\u7684\u5371\u5bb3\u3002<\/p>\n

4\u3001\u600e\u6837\u5c3d\u91cf\u7684\u505a\u5230EMC<\/u>\u89c4\u5b9a\uff0c\u53c8\u4e0d\u81f3\u4e8e\u5bfc\u81f4\u5f88\u5927\u7684\u8d39\u7528\u5de5\u4f5c\u538b\u529b\uff1f<\/strong><\/p>\n

PCB\u677f\u4e0a\u9762\u56e0EMC\u800c\u52a0\u5165\u7684\u6210\u672c\u8d39\u901a\u5e38\u662f\u56e0\u63d0\u5347\u5730\u53e0\u52a0\u5c42\u6570<\/u>\u76ee\u4ee5\u63d0\u9ad8\u5c4f\u853d\u6548\u5e94\u53ca\u63d0\u5347\u4e86ferrite<\/u> bead\u3001choke\u7b49\u6291\u6b62\u9ad8\u9891\u7387\u8c10\u6ce2\u7535\u6d41\u5143\u5668\u4ef6\u7684\u539f\u56e0\u3002\u6b64\u5916\uff0c\u901a\u5e38\u6216\u662f\u9700\u914d\u642d\u5176\u4ed6\u7ec4\u7ec7\u4e0a\u7684\u5c4f\u853d\u6389\u6784\u9020\u624d\u53ef\u4ee5\u4f7f\u6574\u4f53\u7cfb\u7edf\u8f6f\u4ef6\u6839\u636eEMC\u7684\u89c4\u5b9a\u3002\u4e0b\u5217\u4ec5\u5c31PCB\u677f\u7684\u8bbe\u8ba1\u65b9\u6848\u65b9\u6cd5\u7ed9\u4e88\u597d\u591a\u4e2a\u51cf\u5c11\u7535\u6e90\u7535\u8def\u9020\u6210\u7684\u7535\u78c1\u6ce2\u8f90\u5c04\u6548\u7528\u3002<\/p>\n

1)\u5c3d\u91cf\u91c7\u7528\u6570\u636e\u4fe1\u53f7\u76f4\u7ebf\u659c\u7387(slew rate)\u6bd4\u8f83\u6162\u7684\u5143\u5668\u4ef6\uff0c\u4ee5\u51cf\u5c11\u6570\u636e\u4fe1\u53f7\u6240\u5f62\u6210\u7684\u9ad8\u9891\u7387\u6210\u4efd\u3002<\/p>\n

2)\u7559\u610f\u9ad8\u9891\u7387\u5143\u5668\u4ef6\u653e\u7f6e\u7684\u90e8\u4f4d\uff0c\u4e0d\u5fc5\u592a\u6328\u8fd1\u5bf9\u5916\u5f00\u653e\u7684\u5c04\u9891\u8fde\u63a5\u5668<\/u>\u3002<\/p>\n

3)\u7559\u610f\u5feb\u901f\u6570\u636e\u4fe1\u53f7\u7684\u5339\u914d\u7535\u963b\uff0c\u5e03\u7ebf\u5c42\u4ee5\u53ca\u6d41\u56de\u7535\u6d41\u91cf\u9014\u5f84(return current path)\uff0c \u4ee5\u964d\u4f4e\u9ad8\u9891\u7387\u7684\u6298\u5c04\u4e0e\u8f90\u5c04\u6e90\u3002<\/p>\n

4)\u5728\u5404\u5143\u4ef6\u7684\u5f00\u5173\u7535\u6e90\u5f15\u811a\u7f6e\u653e\u5145\u8db3\u4e0e\u9002\u5ea6\u7684\u53bb\u85d5\u5408<\/u>\u7535\u5bb9\u5668\u4ee5\u7f13\u89e3\u7535\u6e90\u5c42\u548c\u5730\u8d28\u6784\u9020\u4e0a\u7684\u566a\u97f3\u3002\u9700\u6ce8\u610f\u7535\u5bb9\u5668\u7684\u76f8\u9891\u7279\u6027\u4e0e\u6eab\u5ea6\u7684\u7279\u70b9\u662f\u4e0d\u662f\u5408\u4e4e\u8bbe\u8ba1\u5ba4\u9700\u3002<\/p>\n

5)\u5bf9\u5916\u5f00\u653e\u7684\u5c04\u9891\u8fde\u63a5\u5668\u5468\u8fb9\u7684\u5730\u53ef\u4e0e\u5730\u8d28\u6784\u9020\u505a\u9002\u5ea6\u5207\u5206\uff0c\u5e76\u5c06\u5c04\u9891\u8fde\u63a5\u5668\u7684\u5730\u5c31\u8fd1\u539f\u5219\u6536\u5230chassis ground\u3002<\/p>\n

6)\u53ef\u9002\u5ea6\u5e94\u7528ground guard\/shunt traces\u5728\u4e00\u4e9b\u5c24\u5176\u5feb\u901f\u7684\u6570\u636e\u4fe1\u53f7\u65c1\u3002\u4f46\u8981\u7559\u610fguard\/shunt traces\u5bf9\u5e03\u7ebf\u7279\u6027\u963b\u6297\u7684\u5371\u5bb3\u3002<\/p>\n

7)\u7535\u6e90\u5c42\u6bd4\u5730\u8d28\u6784\u9020\u5185\u7f2920H\uff0cH\u4e3a\u7535\u6e90\u5c42\u4e0e\u5730\u8d28\u6784\u9020\u4e2d\u95f4\u7684\u95f4\u8ddd\u3002<\/p>\n

5\u3001\u53e6\u4e00\u79cd\u505a\u6cd5\u662f\u5728\u4fdd\u8bc1\u6570\/\u6a21\u5206\u79bb\u5408\u7406\u5e03\u5c40\uff0c\u4e14\u6570\/\u6a21\u6570\u636e\u4fe1\u53f7\u5e03\u7ebf\u4e92\u76f8\u4e0d\u4ea4\u53c9\u5f0f\u7684\u60c5\u5f62\u4e0b\uff0c\u5168\u90e8PCB\u677f\u5730\u4e0d\u505a\u5207\u5206\uff0c\u6570\/\u6a21\u5730\u90fd\u8fde\u5230\u8fd9\u4e00\u5730\u5e73\u9762\u56fe\u4e0a\u3002\u5927\u9053\u7406\u5728\u54ea\uff1f<\/strong><\/p>\n

\u6570\u5b66\u6a21\u578b\u6570\u636e\u4fe1\u53f7\u5e03\u7ebf\u4e0d\u53ef\u4ee5\u4ea4\u53c9\u5f0f\u7684\u89c4\u5b9a\u662f\u7531\u4e8e\u901f\u7387\u504f\u5feb\u7684\u6a21\u62df\u4fe1\u53f7\u5176\u56de\u5230\u7535\u6d41\u91cf\u9014\u5f84(return current path)\u4f1a\u5c3d\u53ef\u80fd\u987a\u7740\u5e03\u7ebf\u7684\u4e0b\u8fb9\u5468\u8fb9\u7684\u5730\u6d41\u5230\u6a21\u62df\u4fe1\u53f7\u7684\u6839\u6e90\uff0c\u82e5\u6570\u5b66\u6a21\u578b\u6570\u636e\u4fe1\u53f7\u5e03\u7ebf\u4ea4\u53c9\u5f0f\uff0c\u5219\u56de\u5230\u7535\u6d41\u91cf\u6240\u5f62\u6210\u7684\u566a\u97f3\u4fbf\u4f1a\u4ea7\u751f\u5728\u6570\u5b57\u96c6\u6210\u7535\u8def\u5730\u533a\u5185\u3002<\/p>\n

6\u3001\u5f53\u4e00\u5757PCB\u677f\u4e2d\u6709\u597d\u51e0\u4e2a\u6570\/\u6a21\u529f\u80fd\u5757\u65f6\uff0c\u57fa\u672c\u65b9\u6cd5\u662f\u8981\u5c06\u6570\/\u6a21\u5730\u5206\u79bb\uff0c\u7f18\u6545\u5728\u54ea\uff1f<\/strong><\/p>\n

\u5c06\u6570\/\u6a21\u5730\u5206\u79bb\u7684\u7f18\u7531\u662f\u7531\u4e8e\u6570\u5b57\u7535\u8def\u8bbe\u8ba1\u5728\u591a\u5c11\u7535\u4f4d\u5dee\u8f6c\u6362\u7684\u65f6\u5019\u4f1a\u5728\u5f00\u5173\u7535\u6e90\u548c\u5730\u9020\u6210\u566a\u97f3\uff0c\u566a\u97f3\u7684\u5c3a\u5bf8\u8ddf\u6570\u636e\u4fe1\u53f7\u7684\u901f\u7387\u53ca\u7535\u6d41\u91cf\u5c3a\u5bf8\u76f8\u5173\u3002\u5047\u5982\u5730\u5e73\u9762\u56fe\u4e0a\u4e0d\u5207\u5206\u4e14\u7531\u6570\u636e\u5730\u533a\u7535\u6e90\u7535\u8def\u6240\u5f62\u6210\u7684\u566a\u97f3\u6bd4\u8f83\u5927\u800c\u4eff\u771f\u6a21\u62df\u5730\u533a\u7684\u7535\u6e90\u7535\u8def\u53c8\u5341\u5206\u8d34\u8fd1\uff0c\u5219\u5373\u4f7f\u6570\u5b66\u6a21\u578b\u6570\u636e\u4fe1\u53f7\u4e0d\u4ea4\u53c9\u5f0f\uff0c \u4eff\u771f\u6a21\u62df\u7684\u6570\u636e\u4fe1\u53f7\u4ecd\u7136\u4f1a\u88ab\u5730\u566a\u97f3\u5f71\u54cd\u3002\u6362\u53e5\u8bdd\u8bf4\u6570\u5b66\u6a21\u578b\u5730\u4e0d\u5207\u5206\u7684\u65b9\u6cd5\u53ea\u6709\u5728\u6570\u5b57\u96c6\u6210\u7535\u8def\u5730\u533a\u8ddd\u9020\u6210\u5927\u566a\u97f3\u7684\u6570\u5b57\u7535\u8def\u8bbe\u8ba1\u5730\u533a\u8f83\u8fdc\u65f6\u5e94\u7528\u3002<\/p>\n

7\u3001\u5728\u5feb\u901fPCB\u8bbe\u8ba1<\/u>\u7535\u8def\u539f\u7406\u56fe\u8bbe\u8ba1\u65b9\u6848\u65f6\uff0c\u600e\u6837\u8003\u8651\u5230\u5339\u914d\u7535\u963b\u95ee\u9898\uff1f<\/strong><\/p>\n

\u5728\u8bbe\u8ba1\u65b9\u6848\u5feb\u901fPCB\u7535\u6e90\u7535\u8def\u65f6\uff0c\u5339\u914d\u7535\u963b\u662f\u5236\u5b9a\u7684\u57fa\u672c\u8981\u7d20\u4e4b\u4e00\u3002\u800c\u7279\u6027\u963b\u6297\u503c\u8ddf\u5e03\u7ebf\u65b9\u6cd5\u6709\u4e00\u5b9a\u7684\u5173\u8054\uff0c \u6bd4\u5982\u662f\u8d70\u5728\u8868\u5c42(microstrip)\u6216\u91cc\u5c42(stripline\/double stripline)\uff0c\u4e0e\u53c2\u7167\u5c42(\u7535\u6e90\u5c42\u6216\u5730\u8d28\u6784\u9020)\u7684\u95f4\u8ddd\uff0c\u5e03\u7ebf\u603b\u5bbd\uff0cPCB\u6750\u6599\u7b49\u5747\u4f1a\u5371\u5bb3\u5e03\u7ebf\u7684\u7279\u6027\u963b\u6297\u503c\u3002\u6362\u53e5\u8bdd\u8bf4\u8981\u5728\u8d70\u7ebf\u540e\u624d\u53ef\u4ee5\u660e\u786e\u7279\u6027\u963b\u6297\u503c\u3002\u4e00\u822c\u6a21\u62df\u4eff\u771f\u8f6f\u4ef6\u4f1a\u56e0\u4e3a\u8def\u7ebf\u5b9e\u4f53\u6a21\u578b\u6216\u6240\u5e94\u7528\u7684\u6570\u5b66\u7b97\u6cd5\u7684\u9650\u5b9a\u800c\u6ca1\u6cd5\u5145\u5206\u8003\u8651\u4e00\u4e9b\u7279\u6027\u963b\u6297\u4e0d\u6301\u7eed\u7684\u8d70\u7ebf\u72b6\u51b5\uff0c\u6b64\u523b\u5728\u5de5\u4f5c\u539f\u7406\u4e0a\u53ea\u6709\u9884\u57cb\u4e00\u4e9bterminators(\u7ebf\u63a5)\uff0c\u5982\u4e32\u8054\u7535\u963b\u7b49\uff0c\u6765\u7f13\u89e3\u5e03\u7ebf\u7279\u6027\u963b\u6297\u4e0d\u6301\u7eed\u7684\u6548\u7528\u3002\u771f\u771f\u6b63\u6b63\u538b\u6839\u89e3\u51b3\u7684\u529e\u6cd5\u6216\u662f\u8d70\u7ebf\u65f6\u5c3d\u53ef\u80fd\u7559\u610f\u9632\u6b62\u7279\u6027\u963b\u6297\u4e0d\u6301\u7eed\u7684\u4ea7\u751f\u3002<\/p>\n

8\u3001\u5728\u5feb\u901fPCB<\/u>\u8bbe\u8ba1\u65b9\u6848\u65f6\uff0c\u8bbe\u8ba1\u5e08\u5e94\u5f53\u4ece\u8fd9\u4e9b\u5c42\u9762\u53bb\u8003\u8651\u5230EMC\u3001EMI\u7684\u6807\u51c6\u5462\uff1f<\/strong><\/p>\n

\u4e00\u822cEMI\/EMC\u8bbe\u8ba1\u65b9\u6848\u65f6\u5fc5\u987b\u4e0e\u6b64\u540c\u65f6\u8003\u8651\u5230\u8f90\u5c04\u6e90(radiated)\u4e0e\u4f20\u8f93(conducted)2\u4e2a\u5c42\u9762. \u524d\u9762\u4e00\u79cd\u5c5e\u4e8e\u5de5\u4f5c\u9891\u7387\u8f83\u9ad8\u7684\u4e00\u90e8\u5206(>30MHz)\u540e\u8005\u5219\u662f\u8f83\u4f4e\u9891\u7387\u7684\u4e00\u90e8\u5206(<30MHz). \u56e0\u6b64\u65e0\u6cd5\u53ea\u7559\u610f\u9ad8\u9891\u7387\u800c\u5ffd\u89c6\u4f4e\u9891\u7387\u7684\u4e00\u90e8\u5206\u3002\u4e00\u4e2a\u597d\u7684EMI\/EMC\u8bbe\u8ba1\u65b9\u6848\u52a1\u5fc5\u4e00\u5f00\u59cb\u5408\u7406\u5e03\u5c40\u65f6\u8fd8\u8981\u5145\u5206\u8003\u8651\u5143\u5668\u4ef6\u7684\u90e8\u4f4d, PCB\u8fed\u5c42\u7684\u5206\u914d, \u5173\u952e\u8054\u7f51\u7684\u8def\u7ebf, \u5143\u5668\u4ef6\u7684\u6311\u9009\u7b49, \u5047\u5982\u8fd9\u79cd\u6c92\u6709\u4e8b\u5148\u6709\u8f83\u597d\u7684\u5206\u914d, \u8fc7\u540e\u5904\u7406\u5219\u4f1a\u4e8b\u534a\u529f\u500d, \u63d0\u5347\u6210\u672c\u8d39. \u6bd4\u5982\u949f\u8868<\/u>\u53d1\u751f\u5668\u7684\u90e8\u4f4d\u6700\u597d\u4e0d\u8981\u6328\u8fd1\u5bf9\u5916\u5f00\u653e\u7684\u5c04\u9891\u8fde\u63a5\u5668, \u5feb\u901f\u6570\u636e\u4fe1\u53f7\u5c3d\u53ef\u80fd\u8d70\u91cc\u5c42\u5e76\u7559\u610f\u7279\u70b9\u5339\u914d\u7535\u963b\u4e0e\u53c2\u7167\u5c42\u7684\u6301\u7eed\u4ee5\u51cf\u5c0f\u53cd\u5c04\u9762, \u5143\u5668\u4ef6\u6240\u63a8\u7684\u8d70\u52bf\u4e4b\u76f4\u7ebf\u659c\u7387(slew rate)\u5c3d\u53ef\u80fd\u5c0f\u4ee5\u964d\u4f4e\u9ad8\u9891\u7387\u6210\u4efd, \u6311\u9009\u53bb\u85d5\u5408(decoupling\/bypass)\u7535\u5bb9\u5668\u65f6\u7559\u610f\u5176\u76f8\u9891\u7279\u6027\u662f\u4e0d\u662f\u5408\u4e4e\u8981\u6c42\u4ee5\u51cf\u5c11\u7535\u6e90\u5c42\u566a\u97f3\u3002\u6b64\u5916, \u7559\u610f\u9ad8\u9891\u7387\u6570\u636e\u4fe1\u53f7\u7535\u6d41\u91cf\u4e4b\u6d41\u56de\u9014\u5f84\u4f7f\u5176\u63a7\u5236\u56de\u8def\u603b\u9762\u79ef\u5c3d\u53ef\u80fd\u5c0f(\u4e5f\u5c31\u662f\u63a7\u5236\u56de\u8def\u7279\u6027\u963b\u6297loop impedance\u5c3d\u53ef\u80fd\u5c0f)\u4ee5\u964d\u4f4e\u8f90\u5c04\u6e90. \u8fd8\u80fd\u591f\u7528\u5207\u5206\u5730\u8d28\u6784\u9020\u7684\u63aa\u65bd\u4ee5\u64cd\u7eb5\u9ad8\u9891\u7387\u566a\u97f3\u7684\u8303\u7574. \u6700\u7ec8, \u9002\u5ea6\u7684\u6311\u9009PCB\u4e0e\u673a\u58f3\u7684\u63a5\u5730\u5740(chassis ground)\u3002<\/p>\n

9\u3001\u54ea\u513f\u80fd\u7ed9\u4e88\u8f83\u4e3a\u786e\u5207\u7684IBIS3d\u6a21\u578b\u5e93\uff1f<\/strong><\/p>\n

10\u3001\u5982\u4f55\u9009\u62e9EDA\u4e13\u7528\u5de5\u5177\uff1f<\/strong><\/p>\n

\u73b0\u9636\u6bb5\u7684pcb\u5236\u56fe\u8f6f\u4ef6\u4e2d\uff0c\u70ed\u5206\u6790\u90fd\u5e76\u4e0d\u662f\u4f18\u52bf\uff0c\u56e0\u6b64\u5e76\u4e0d\u5efa\u8bae\u91c7\u7528\uff0c\u5176\u4ed6\u7684\u4f5c\u75281.3.4\u53ef\u4ee5\u6311\u9009PADS<\/u>\u6216Cadence<\/u>\u7279\u6027\u4ef7\u683c\u5bf9\u6bd4\u90fd\u975e\u5e38\u597d\u3002PLD\u7684\u5236\u5b9a\u7684\u65b0\u624b\u53ef\u4ee5\u9009\u7528PLD\u96c6\u6210ic\u751f\u4ea7\u5382\u5bb6\u5e26\u6765\u7684\u96c6\u6210\u5316\u81ea\u7136\u73af\u5883\uff0c\u5728\u4fdd\u8bc1\u4e0a\u767e\u4e07\u95e8\u4ee5\u4e0a\u7684\u5236\u5b9a\u65f6\u53ef\u4ee5\u91c7\u7528\u70b9\u5c04\u4e13\u7528\u5de5\u5177\u3002<\/p>\n

 <\/p>\n

 <\/p>\n

\n

\u6d3e\u65d7\u7eb3\u7c73\u5b98\u7f51\uff1ahttps:\/\/paiqinano.com<\/p>\n

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\u6280\u672f\u54a8\u8be2\uff1a\u8d75\u5148\u751f\uff1a130 4896 4893<\/p>\n

\"\"<\/p>\n

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