\n\t1.2 \u6570\u5b57\u3001\u6a21\u62df\u5143\u5668\u4ef6<\/u>\u53ca\u76f8\u5e94\u8d70\u7ebf\u5c3d\u91cf\u5206\u5f00\u5e76\u653e\u7f6e\u65bc\u5404\u81ea\u7684\u5e03\u7ebf\u533a\u57df\u5185\u3002<\/p>\n
\n\t![\"PCB\u8d70\u7ebf\u6709\u54ea\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\"](\"http:\/\/www.szryc.com\/uploads\/allimg\/190828\/102421J36-0.png\")
<\/p>\n
\n\t1.3 \u9ad8\u901f\u6570\u5b57\u4fe1\u53f7\u8d70\u7ebf\u5c3d\u91cf\u77ed\u3002<\/p>\n
\n\t1.4 \u654f\u611f\u6a21\u62df\u4fe1\u53f7\u8d70\u7ebf\u5c3d\u91cf\u77ed\u3002<\/p>\n
\n\t1.5 \u5408\u7406\u5206\u914d\u7535\u6e90\u548c\u5730\u3002<\/p>\n
\n\t1.6 DGND\u3001AGND\u3001\u5b9e\u5730\u5206\u5f00\u3002<\/p>\n
\n\t1.7 \u7535\u6e90\u53ca\u4e34\u754c\u4fe1\u53f7\u8d70\u7ebf\u4f7f\u7528\u5bbd\u7ebf\u3002<\/p>\n
\n\t1.8 \u6570\u5b57\u7535\u8def<\/u>\u653e\u7f6e\u65bc\u5e76\u884c\u603b\u7ebf\/\u4e32\u884cDTE<\/u>\u63a5\u53e3<\/u>\u9644\u8fd1\uff0cDAA\u7535\u8def<\/u>\u653e\u7f6e\u65bc\u7535\u8bdd\u7ebf\u63a5\u53e3\u9644\u8fd1\u3002<\/p>\n
\n\t2. \u5143\u5668\u4ef6\u653e\u7f6e<\/p>\n
\n\t2.1 \u5728\u7cfb\u7edf\u7535\u8def\u539f\u7406\u56fe\u4e2d\uff1a<\/p>\n
\n\ta\uff09 \u5212\u5206\u6570\u5b57\u3001\u6a21\u62df\u3001DAA\u7535\u8def\u53ca\u5176\u76f8\u5173\u7535\u8def\uff1b<\/p>\n
\n\tb\uff09 \u5728\u5404\u4e2a\u7535\u8def\u4e2d\u5212\u5206\u6570\u5b57\u3001\u6a21\u62df\u3001\u6df7\u5408\u6570\u5b57\/\u6a21\u62df\u5143\u5668\u4ef6\uff1b<\/p>\n
\n\tc\uff09 \u6ce8\u610f\u5404IC\u82af\u7247\u7535\u6e90\u548c\u4fe1\u53f7\u5f15\u811a\u7684\u5b9a\u4f4d\u3002<\/p>\n
\n\t2.2 \u521d\u6b65\u5212\u5206\u6570\u5b57\u3001\u6a21\u62df\u3001DAA\u7535\u8def\u5728PCB<\/u>\u677f\u4e0a\u7684\u5e03\u7ebf\u533a\u57df\uff08\u4e00\u822c\u6bd4\u4f8b2\/1\/1\uff09\uff0c\u6570\u5b57\u3001\u6a21\u62df\u5143\u5668\u4ef6\u53ca\u5176\u76f8\u5e94\u8d70\u7ebf\u5c3d\u91cf\u8fdc\u79bb\u5e76\u9650\u5b9a\u5728\u5404\u81ea\u7684\u5e03\u7ebf\u533a\u57df\u5185\u3002<\/p>\n
\n\tNote\uff1a\u5f53DAA\u7535\u8def\u5360\u8f83\u5927\u6bd4\u91cd\u65f6\uff0c\u4f1a\u6709\u8f83\u591a\u63a7\u5236\/\u72b6\u6001\u4fe1\u53f7\u8d70\u7ebf\u7a7f\u8d8a\u5176\u5e03\u7ebf\u533a\u57df\uff0c\u53ef\u6839\u636e\u5f53\u5730\u89c4\u5219\u9650\u5b9a\u505a\u8c03\u6574\uff0c\u5982\u5143\u5668\u4ef6\u95f4\u8ddd\u3001\u9ad8\u538b\u6291\u5236\u3001\u7535\u6d41<\/u>\u9650\u5236\u7b49\u3002<\/p>\n
\n\t2.3 \u521d\u6b65\u5212\u5206\u5b8c\u6bd5\u540e\uff0c\u4eceConnector\u548cJack\u5f00\u59cb\u653e\u7f6e\u5143\u5668\u4ef6\uff1a<\/p>\n
\n\ta\uff09 Connector\u548cJack\u5468\u56f4\u7559\u51fa\u63d2\u4ef6\u7684\u4f4d\u7f6e\uff1b<\/p>\n
\n\tb\uff09 \u5143\u5668\u4ef6\u5468\u56f4\u7559\u51fa\u7535\u6e90\u548c\u5730\u8d70\u7ebf\u7684\u7a7a\u95f4\uff1b<\/p>\n
\n\tc\uff09 Socket\u5468\u56f4\u7559\u51fa\u76f8\u5e94\u63d2\u4ef6\u7684\u4f4d\u7f6e\u3002<\/p>\n
\n\t2.4 \u9996\u5148\u653e\u7f6e\u6df7\u5408\u578b\u5143\u5668\u4ef6\uff08\u5982Modem\u5668\u4ef6\u3001A\/D\u3001D\/A\u8f6c\u6362\u82af\u7247\u7b49\uff09\uff1a<\/p>\n
\n\ta\uff09 \u786e\u5b9a\u5143\u5668\u4ef6\u653e\u7f6e\u65b9\u5411\uff0c\u5c3d\u91cf\u4f7f\u6570\u5b57\u4fe1\u53f7\u53ca\u6a21\u62df\u4fe1\u53f7\u5f15\u811a\u671d\u5411\u5404\u81ea\u5e03\u7ebf\u533a\u57df\uff1b<\/p>\n
\n\tb\uff09 \u5c06\u5143\u5668\u4ef6\u653e\u7f6e\u5728\u6570\u5b57\u548c\u6a21\u62df\u4fe1\u53f7\u5e03\u7ebf\u533a\u57df\u7684\u4ea4\u754c\u5904\u3002<\/p>\n
\n\t2.5 \u653e\u7f6e\u6240\u6709\u7684\u6a21\u62df\u5668\u4ef6\uff1a<\/p>\n
\n\ta\uff09 \u653e\u7f6e\u6a21\u62df\u7535\u8def\u5143\u5668\u4ef6\uff0c\u5305\u62ecDAA\u7535\u8def\uff1b<\/p>\n
\n\tb\uff09 \u6a21\u62df\u5668\u4ef6\u76f8\u4e92\u9760\u8fd1\u4e14\u653e\u7f6e\u5728PCB\u4e0a\u5305\u542bTXA1\u3001TXA2\u3001RIN\u3001VC\u3001VR<\/u>EF\u4fe1\u53f7\u8d70\u7ebf\u7684\u4e00\u9762\uff1b<\/p>\n
\n\tc\uff09 TXA1\u3001TXA2\u3001RIN\u3001VC\u3001VREF\u4fe1\u53f7\u8d70\u7ebf\u5468\u56f4\u907f\u514d\u653e\u7f6e\u9ad8\u566a\u58f0\u5143\u5668\u4ef6\uff1b<\/p>\n
\n\td\uff09 \u5bf9\u65bc\u4e32\u884cDTE\u6a21\u5757\uff0cDTE EIA\/TI<\/u>A-232-E<\/p>\n
\n\t\u7cfb\u5217\u63a5\u53e3\u4fe1\u53f7\u7684\u63a5\u6536\/\u9a71\u52a8\u5668\u5c3d\u91cf\u9760\u8fd1Connector\u5e76\u8fdc\u79bb\u9ad8\u9891\u65f6\u949f<\/u>\u4fe1\u53f7\u8d70\u7ebf\uff0c\u4ee5\u51cf\u5c11\/\u907f\u514d\u6bcf\u6761\u7ebf\u4e0a\u589e\u52a0\u7684\u566a\u58f0\u6291\u5236\u5668\u4ef6\uff0c\u5982\u963b\u6d41\u5708\u548c\u7535\u5bb9<\/u>\u7b49\u3002<\/p>\n
\n\t2.6 \u653e\u7f6e\u6570\u5b57\u5143\u5668\u4ef6\u53ca\u53bb\u8026\u7535\u5bb9\uff1a<\/p>\n
\n\ta\uff09 \u6570\u5b57\u5143\u5668\u4ef6\u96c6\u4e2d\u653e\u7f6e\u4ee5\u51cf\u5c11\u8d70\u7ebf\u957f\u5ea6\uff1b<\/p>\n
\n\tb\uff09 \u5728IC\u7684\u7535\u6e90\/\u5730\u95f4\u653e\u7f6e0.1uF\u7684\u53bb\u8026\u7535\u5bb9\uff0c\u8fde\u63a5\u8d70\u7ebf\u5c3d\u91cf\u77ed\u4ee5\u51cf\u5c0fEMI<\/u>\uff1b<\/p>\n
\n\tc\uff09 \u5bf9\u5e76\u884c\u603b\u7ebf\u6a21\u5757\uff0c\u5143\u5668\u4ef6\u7d27\u9760<\/p>\n
\n\tConnector\u8fb9\u7f18\u653e\u7f6e\uff0c\u4ee5\u7b26\u5408\u5e94\u7528\u603b\u7ebf\u63a5\u53e3\u6807\u51c6\uff0c\u5982ISA\u603b\u7ebf\u8d70\u7ebf\u957f\u5ea6\u9650\u5b9a\u57282.5in\uff1b<\/p>\n
\n\td\uff09 \u5bf9\u4e32\u884cDTE\u6a21\u5757\uff0c\u63a5\u53e3\u7535\u8def\u9760\u8fd1Connector\uff1b<\/p>\n
\n\te\uff09 \u6676\u632f<\/u>\u7535\u8def\u5c3d\u91cf\u9760\u8fd1\u5176\u9a71\u52a8\u5668\u4ef6\u3002<\/p>\n
\n\t2.7 \u5404\u533a\u57df\u7684\u5730\u7ebf\uff0c\u901a\u5e38\u75280 Ohm\u7535\u963b<\/u>\u6216bead\u5728\u4e00\u70b9\u6216\u591a\u70b9\u76f8\u8fde\u3002<\/p>\n
\n\t3. \u4fe1\u53f7\u8d70\u7ebf<\/p>\n
\n\t3.1 Modem\u4fe1\u53f7\u8d70\u7ebf\u4e2d\uff0c\u6613\u4ea7\u751f\u566a\u58f0\u7684\u4fe1\u53f7\u7ebf\u548c\u6613\u53d7\u5e72\u6270\u7684\u4fe1\u53f7\u7ebf\u5c3d\u91cf\u8fdc\u79bb\uff0c\u5982\u65e0\u6cd5\u907f\u514d\u65f6\u8981\u7528\u4e2d\u6027\u4fe1\u53f7\u7ebf\u9694\u79bb\u3002<\/p>\n
\n\tModem\u6613\u4ea7\u751f\u566a\u58f0\u7684\u4fe1\u53f7\u5f15\u811a\u3001\u4e2d\u6027\u4fe1\u53f7\u5f15\u811a\u3001\u6613\u53d7\u5e72\u6270\u7684\u4fe1\u53f7\u5f15\u811a\u5982\u4e0b\u8868\u6240\u793a\uff1a<\/p>\n
\n\t3.2 \u6570\u5b57\u4fe1\u53f7\u8d70\u7ebf\u5c3d\u91cf\u653e\u7f6e\u5728\u6570\u5b57\u4fe1\u53f7\u5e03\u7ebf\u533a\u57df\u5185\uff1b<\/p>\n
\n\t\u6a21\u62df\u4fe1\u53f7\u8d70\u7ebf\u5c3d\u91cf\u653e\u7f6e\u5728\u6a21\u62df\u4fe1\u53f7\u5e03\u7ebf\u533a\u57df\u5185\uff1b<\/p>\n
\n\t\uff08\u53ef\u9884\u5148\u653e\u7f6e\u9694\u79bb\u8d70\u7ebf\u52a0\u4ee5\u9650\u5b9a\uff0c\u4ee5\u9632\u8d70\u7ebf\u5e03\u51fa\u5e03\u7ebf\u533a\u57df\uff09<\/p>\n
\n\t\u6570\u5b57\u4fe1\u53f7\u8d70\u7ebf\u548c\u6a21\u62df\u4fe1\u53f7\u8d70\u7ebf\u5782\u76f4\u4ee5\u51cf\u5c0f\u4ea4\u53c9\u8026\u5408<\/u>\u3002<\/p>\n
\n\t3.3 \u4f7f\u7528\u9694\u79bb\u8d70\u7ebf\uff08\u901a\u5e38\u4e3a\u5730\uff09\u5c06\u6a21\u62df\u4fe1\u53f7\u8d70\u7ebf\u9650\u5b9a\u5728\u6a21\u62df\u4fe1\u53f7\u5e03\u7ebf\u533a\u57df\u3002<\/p>\n
\n\ta\uff09 \u6a21\u62df\u533a\u9694\u79bb\u5730\u8d70\u7ebf\u73af\u7ed5\u6a21\u62df\u4fe1\u53f7\u5e03\u7ebf\u533a\u57df\u5e03\u5728PCB\u677f\u4e24\u9762\uff0c\u7ebf\u5bbd50-100mil\uff1b<\/p>\n
\n\tb\uff09 \u6570\u5b57\u533a\u9694\u79bb\u5730\u8d70\u7ebf\u73af\u7ed5\u6570\u5b57\u4fe1\u53f7\u5e03\u7ebf\u533a\u57df\u5e03\u5728PCB\u677f\u4e24\u9762\uff0c\u7ebf\u5bbd50-100mil\uff0c\u5176\u4e2d\u4e00\u9762PCB\u677f\u8fb9\u5e94\u5e03200mil\u5bbd\u5ea6\u3002<\/p>\n
\n\t3.4 \u5e76\u884c\u603b\u7ebf\u63a5\u53e3\u4fe1\u53f7\u8d70\u7ebf\u7ebf\u5bbd\u300b10mil\uff08\u4e00\u822c\u4e3a12-15mil\uff09\uff0c\u5982\/HCS\u3001\/HRD\u3001\/HWT\u3001\/RESET\u3002<\/p>\n
\n\t3.5 \u6a21\u62df\u4fe1\u53f7\u8d70\u7ebf\u7ebf\u5bbd\u300b10mil\uff08\u4e00\u822c\u4e3a12-15mil\uff09\uff0c\u5982MICM\u3001MICV\u3001SPKV\u3001VC\u3001VREF\u3001TXA1\u3001TXA2\u3001RXA\u3001TELIN\u3001TELOUT\u3002<\/p>\n
\n\t3.6 \u6240\u6709\u5176\u5b83\u4fe1\u53f7\u8d70\u7ebf\u5c3d\u91cf\u5bbd\uff0c\u7ebf\u5bbd\u300b5mil\uff08\u4e00\u822c\u4e3a 10mil\uff09\uff0c\u5143\u5668\u4ef6\u95f4\u8d70\u7ebf\u5c3d\u91cf\u77ed\uff08\u653e\u7f6e\u5668\u4ef6\u65f6\u5e94\u9884\u5148\u8003\u8651\uff09\u3002<\/p>\n
\n\t3.7 \u65c1\u8def\u7535\u5bb9\u5230\u76f8\u5e94IC\u7684\u8d70\u7ebf\u7ebf\u5bbd\u300b25mil\uff0c\u5e76\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\u8fc7\u5b54\u3002<\/p>\n
\n\t3.8 \u901a\u8fc7\u4e0d\u540c\u533a\u57df\u7684\u4fe1\u53f7\u7ebf\uff08\u5982\u5178\u578b\u7684\u4f4e\u901f\u63a7\u5236\/\u72b6\u6001\u4fe1\u53f7\uff09\u5e94\u5728\u4e00\u70b9\uff08\u9996\u9009\uff09\u6216\u4e24\u70b9\u901a\u8fc7\u9694\u79bb\u5730\u7ebf\u3002\u5982\u679c\u8d70\u7ebf\u53ea\u4f4d\u65bc\u4e00\u9762\uff0c \u9694\u79bb\u5730\u7ebf\u53ef\u8d70\u5230PCB\u7684\u53e6\u4e00\u9762\u4ee5\u8df3\u8fc7\u4fe1\u53f7\u8d70\u7ebf\u800c\u4fdd\u6301\u8fde\u7eed\u3002<\/p>\n
\n\t3.9 \u9ad8\u9891\u4fe1\u53f7\u8d70\u7ebf\u907f\u514d\u4f7f\u752890\u5ea6\u89d2\u5f2f\u8f6c\uff0c\u5e94\u4f7f\u7528\u5e73\u6ed1\u5706\u5f27\u621645\u5ea6\u89d2\u3002<\/p>\n
\n\t3.10 \u9ad8\u9891\u4fe1\u53f7\u8d70\u7ebf\u5e94\u51cf\u5c11\u4f7f\u7528\u8fc7\u5b54\u8fde\u63a5\u3002<\/p>\n
\n\t3.11 \u6240\u6709\u4fe1\u53f7\u8d70\u7ebf\u8fdc\u79bb\u6676\u632f\u7535\u8def\u3002<\/p>\n
\n\t3.12 \u5bf9\u9ad8\u9891\u4fe1\u53f7\u8d70\u7ebf\u5e94\u91c7\u7528\u5355\u4e00\u8fde\u7eed\u8d70\u7ebf\uff0c\u907f\u514d\u51fa\u73b0\u4ece\u4e00\u70b9\u5ef6\u4f38\u51fa\u51e0\u6bb5\u8d70\u7ebf\u7684\u60c5\u51b5\u3002<\/p>\n
\n\t3.13 DAA\u7535\u8def\u4e2d\uff0c\u7a7f\u5b54\u5468\u56f4\uff08\u6240\u6709\u5c42\u9762\uff09\u7559\u51fa\u81f3\u5c1160mil\u7684\u7a7a\u95f4\u3002<\/p>\n
\n\t3.14 \u6e05\u9664\u5730\u7ebf\u73af\u8def\uff0c\u4ee5\u9632\u610f\u5916\u7535\u6d41\u56de\u9988\u5f71\u54cd\u7535\u6e90\u3002<\/p>\n
\n\t4. \u7535\u6e90<\/p>\n
\n\t4.1 \u786e\u5b9a\u7535\u6e90\u8fde\u63a5\u5173\u7cfb\u3002<\/p>\n
\n\t4.2 \u6570\u5b57\u4fe1\u53f7\u5e03\u7ebf\u533a\u57df\u4e2d\uff0c\u752810uF\u7535\u89e3\u7535\u5bb9\u6216\u94bd\u7535\u5bb9<\/u>\u4e0e0.1uF\u74f7\u7247\u7535\u5bb9\u5e76\u8054\u540e\u63a5\u5728\u7535\u6e90\/\u5730\u4e4b\u95f4\u3002\u5728PCB\u677f\u7535\u6e90\u5165\u53e3\u7aef\u548c\u6700\u8fdc\u7aef\u5404\u653e\u7f6e\u4e00\u5904\uff0c\u4ee5\u9632\u7535\u6e90\u5c16\u5cf0\u8109\u51b2\u5f15\u53d1\u7684\u566a\u58f0\u5e72\u6270\u3002<\/p>\n
\n\t4.3 \u5bf9\u53cc\u9762\u677f\uff0c\u5728\u7528\u7535\u7535\u8def\u76f8\u540c\u5c42\u9762\u4e2d\uff0c\u7528\u4e24\u8fb9\u7ebf\u5bbd\u4e3a 200mil\u7684\u7535\u6e90\u8d70\u7ebf\u73af\u7ed5\u8be5\u7535\u8def\u3002\uff08\u53e6\u4e00\u9762\u987b\u7528\u6570\u5b57\u5730\u505a\u76f8\u540c\u5904\u7406\uff09<\/p>\n
\n\t4.4 \u4e00\u822c\u5730\uff0c\u5148\u5e03\u7535\u6e90\u8d70\u7ebf\uff0c\u518d\u5e03\u4fe1\u53f7\u8d70\u7ebf\u3002<\/p>\n
\n\t5. \u5730<\/p>\n
\n\t5.1\u53cc\u9762\u677f\u4e2d\uff0c\u6570\u5b57\u548c\u6a21\u62df\u5143\u5668\u4ef6\uff08\u9664DAA\uff09\u5468\u56f4\u53ca\u4e0b\u65b9\u672a\u4f7f\u7528\u4e4b\u533a\u57df\u7528\u6570\u5b57\u5730\u6216\u6a21\u62df\u5730\u533a\u57df\u586b\u5145\uff0c\u5404\u5c42\u9762\u540c\u7c7b\u5730\u533a\u57df\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u4e0d\u540c\u5c42\u9762\u540c\u7c7b\u5730\u533a\u57df\u901a\u8fc7\u591a\u4e2a\u8fc7\u5b54\u76f8\u8fde\uff1aModem DGND\u5f15\u811a\u63a5\u81f3\u6570\u5b57\u5730\u533a\u57df\uff0cAGND\u5f15\u811a\u63a5\u81f3\u6a21\u62df\u5730\u533a\u57df;\u6570\u5b57\u5730\u533a\u57df\u548c\u6a21\u62df\u5730\u533a\u57df\u7528\u4e00\u6761\u76f4\u7684\u7a7a\u9699\u9694\u5f00\u3002<\/p>\n
\n\t5.2 \u56db\u5c42\u677f\u4e2d\uff0c\u4f7f\u7528\u6570\u5b57\u548c\u6a21\u62df\u5730\u533a\u57df\u8986\u76d6\u6570\u5b57\u548c\u6a21\u62df\u5143\u5668\u4ef6\uff08\u9664DAA\uff09\uff1bModem DGND\u5f15\u811a\u63a5\u81f3\u6570\u5b57\u5730\u533a\u57df\uff0cAGND\u5f15\u811a\u63a5\u81f3\u6a21\u62df\u5730\u533a\u57df;\u6570\u5b57\u5730\u533a\u57df\u548c\u6a21\u62df\u5730\u533a\u57df\u7528\u4e00\u6761\u76f4\u7684\u7a7a\u9699\u9694\u5f00\u3002<\/p>\n
\n\t5.3 \u5982\u8bbe\u8ba1\u4e2d\u987bEMI\u8fc7\u6ee4\u5668\uff0c\u5e94\u5728\u63a5\u53e3\u63d2\u5ea7\u7aef\u9884\u7559\u4e00\u5b9a\u7a7a\u95f4\uff0c\u7edd\u5927\u591a\u6570EMI\u5668\u4ef6\uff08Bead\/\u7535\u5bb9\uff09\u5747\u53ef\u653e\u7f6e\u5728\u8be5\u533a\u57df;\u672a\u4f7f\u7528\u4e4b\u533a\u57df\u7528\u5730\u533a\u57df\u586b\u5145\uff0c\u5982\u6709\u5c4f\u853d\u5916\u58f3\u4e5f\u987b\u4e0e\u4e4b\u76f8\u8fde\u3002<\/p>\n
\n\t5.4 \u6bcf\u4e2a\u529f\u80fd\u6a21\u5757\u7535\u6e90\u5e94\u5206\u5f00\u3002\u529f\u80fd\u6a21\u5757\u53ef\u5206\u4e3a\uff1a\u5e76\u884c\u603b\u7ebf\u63a5\u53e3\u3001\u663e\u793a\u3001\u6570\u5b57\u7535\u8def\uff08SRAM<\/u>\u3001EPROM<\/u>\u3001Modem\uff09\u548cDAA\u7b49\uff0c\u6bcf\u4e2a\u529f\u80fd\u6a21\u5757\u7684\u7535\u6e90\/\u5730\u53ea\u80fd\u5728\u7535\u6e90\/\u5730\u7684\u6e90\u70b9\u76f8\u8fde\u3002<\/p>\n
\n\t5.5 \u5bf9\u4e32\u884cDTE\u6a21\u5757\uff0c\u4f7f\u7528\u53bb\u8026\u7535\u5bb9\u51cf\u5c11\u7535\u6e90\u8026\u5408\uff0c\u5bf9\u7535\u8bdd\u7ebf\u4e5f\u53ef\u505a\u76f8\u540c\u5904\u7406\u3002<\/p>\n
\n\t5.6 \u5730\u7ebf\u901a\u8fc7\u4e00\u70b9\u76f8\u8fde\uff0c\u5982\u53ef\u80fd\uff0c\u4f7f\u7528Bead\uff1b\u5982\u6291\u5236EMI\u9700\u8981\uff0c\u5141\u8bb8\u5730\u7ebf\u5728\u5176\u5b83\u5730\u65b9\u76f8\u8fde\u3002<\/p>\n
\n\t5.7 \u6240\u6709\u5730\u7ebf\u8d70\u7ebf\u5c3d\u91cf\u5bbd\uff0c25-50mil\u3002<\/p>\n
\n\t5.8 \u6240\u6709IC\u7535\u6e90\/\u5730\u95f4\u7684\u7535\u5bb9\u8d70\u7ebf\u5c3d\u91cf\u77ed\uff0c\u5e76\u4e0d\u8981\u4f7f\u7528\u8fc7\u5b54\u3002<\/p>\n
\n\t6. \u6676\u632f\u7535\u8def<\/p>\n
\n\t6.1 \u6240\u6709\u8fde\u5230\u6676\u632f\u8f93\u5165\/\u8f93\u51fa\u7aef\uff08\u5982XTLI\u3001XTLO\uff09\u7684\u8d70\u7ebf\u5c3d\u91cf\u77ed\uff0c\u4ee5\u51cf\u5c11\u566a\u58f0\u5e72\u6270\u53ca\u5206\u5e03\u7535\u5bb9\u5bf9Crystal\u7684\u5f71\u54cd\u3002XTLO\u8d70\u7ebf\u5c3d\u91cf\u77ed\uff0c\u4e14\u5f2f\u8f6c\u89d2\u5ea6\u4e0d\u5c0f\u65bc45\u5ea6\u3002\uff08\u56e0XTLO\u8fde\u63a5\u81f3\u4e0a\u5347\u65f6\u95f4\u5feb\uff0c\u5927\u7535\u6d41\u4e4b\u9a71\u52a8\u5668\uff09<\/p>\n
\n\t6.2 \u53cc\u9762\u677f\u4e2d\u6ca1\u6709\u5730\u7ebf\u5c42\uff0c\u6676\u632f\u7535\u5bb9\u5730\u7ebf\u5e94\u4f7f\u7528\u5c3d\u91cf\u5bbd\u7684\u77ed\u7ebf\u8fde\u63a5\u81f3\u5668\u4ef6\u4e0a\u79bb\u6676\u632f\u6700\u8fd1\u7684DGND\u5f15\u811a\uff0c\u4e14\u5c3d\u91cf\u51cf\u5c11\u8fc7\u5b54\u3002<\/p>\n
\n\t6.3 \u5982\u53ef\u80fd\uff0c\u6676\u632f\u5916\u58f3\u63a5\u5730\u3002<\/p>\n
\n\t6.4 \u5728XTLO\u5f15\u811a\u4e0e\u6676\u632f\/\u7535\u5bb9\u8282\u70b9\u5904\u63a5\u4e00\u4e2a100 Ohm\u7535\u963b\u3002<\/p>\n
\n\t6.5 \u6676\u632f\u7535\u5bb9\u7684\u5730\u76f4\u63a5\u8fde\u63a5\u81f3 Modem\u7684GND\u5f15\u811a\uff0c\u4e0d\u8981\u4f7f\u7528\u5730\u7ebf\u533a\u57df\u6216\u5730\u7ebf\u8d70\u7ebf\u6765\u8fde\u63a5\u7535\u5bb9\u548cModem\u7684GND\u5f15\u811a\u3002<\/p>\n
\n\t7. \u4f7f\u7528EIA\/TIA-232\u63a5\u53e3\u7684\u72ec\u7acbModem\u8bbe\u8ba1<\/p>\n
\n\t7.1 \u4f7f\u7528\u91d1\u5c5e\u5916\u58f3\u3002 \u5982\u679c\u987b\u7528\u5851\u6599\u5916\u58f3\uff0c\u5e94\u5728\u5185\u90e8\u8d34\u91d1\u5c5e\u7b94\u7247\u6216\u55b7\u5bfc\u7535\u7269\u8d28\u4ee5\u51cf\u5c0fEMI\u3002<\/p>\n
\n\t7.2 \u5404\u7535\u6e90\u7ebf\u4e0a\u653e\u7f6e\u76f8\u540c\u6a21\u5f0f\u7684Choke\u3002<\/p>\n
\n\t7.3 \u5143\u5668\u4ef6\u653e\u7f6e\u5728\u4e00\u8d77\u5e76\u7d27\u9760EIA\/TIA-232\u63a5\u53e3\u7684Connector\u3002<\/p>\n
\n\t7.4 \u6240\u6709EIA\/TIA-232\u5668\u4ef6\u4ece\u7535\u6e90\u6e90\u70b9\u5355\u72ec\u8fde\u63a5\u7535\u6e90\/\u5730\u3002\u7535\u6e90\/\u5730\u7684\u6e90\u70b9\u5e94\u4e3a\u677f\u4e0a\u7535\u6e90\u8f93\u5165\u7aef\u6216\u8c03\u538b\u82af\u7247\u7684\u8f93\u51fa\u7aef\u3002<\/p>\n
\n\t7.5 EIA\/TIA-232\u7535\u7f06<\/u>\u4fe1\u53f7\u5730\u63a5\u81f3\u6570\u5b57\u5730\u3002<\/p>\n
\n\t\u9488\u5bf9\u6a21\u62df\u4fe1\u53f7\uff0c\u518d\u4f5c\u4e00\u4e9b\u8be6\u7ec6\u8bf4\u660e\uff1a<\/p>\n
\n\t\u6a21\u62df\u7535\u8def\u7684\u8bbe\u8ba1\u662f\u5de5\u7a0b\u5e08\u4eec\u6700\u5934\u75bc\u3001\u4f46\u4e5f\u662f\u6700\u81f4\u547d\u7684\u8bbe\u8ba1\u90e8\u5206\uff0c\u5c3d\u7ba1\u76ee\u524d\u6570\u5b57\u7535\u8def\u3001\u5927\u89c4\u6a21\u96c6\u6210\u7535\u8def<\/u>\u7684\u53d1\u5c55\u975e\u5e38\u8fc5\u731b\uff0c\u4f46\u662f\u6a21\u62df\u7535\u8def\u7684\u8bbe\u8ba1\u4ecd\u662f\u4e0d\u53ef\u907f\u514d\u7684\uff0c\u6709\u65f6\u4e5f\u662f\u6570\u5b57\u7535\u8def\u65e0\u6cd5\u53d6\u4ee3\u7684\uff0c\u4f8b\u5982 RF<\/u> \u5c04\u9891<\/u>\u7535\u8def\u7684\u8bbe\u8ba1\uff01\u8fd9\u91cc\u5c06\u6a21\u62df\u7535\u8def\u8bbe\u8ba1\u4e2d\u5e94\u8be5\u6ce8\u610f\u7684\u95ee\u9898\u603b\u7ed3\u5982\u4e0b\uff0c\u6709\u4e9b\u7eaf\u5c5e\u7ecf\u9a8c\u4e4b\u8c08\uff0c\u8fd8\u671b\u5927\u5bb6\u591a\u591a\u8865\u5145\u3001\u591a\u591a\u6279\u8bc4\u6307\u6b63\uff01\u3002\u3002.<\/p>\n
\n\t\uff081\uff09\u4e3a\u4e86\u83b7\u5f97\u5177\u6709\u826f\u597d\u7a33\u5b9a\u6027\u7684\u53cd\u9988\u7535\u8def\uff0c\u901a\u5e38\u8981\u6c42\u5728\u53cd\u9988\u73af\u5916\u9762\u4f7f\u7528\u4e00\u4e2a\u5c0f\u7535\u963b\u6216\u627c\u6d41\u5708\u7ed9\u5bb9\u6027\u8d1f\u8f7d\u63d0\u4f9b\u4e00\u4e2a\u7f13\u51b2\u3002<\/p>\n
\n\t\uff082\uff09\u79ef\u5206\u53cd\u9988\u7535\u8def\u901a\u5e38\u9700\u8981\u4e00\u4e2a\u5c0f\u7535\u963b\uff08\u7ea6 560 \u6b27\uff09\u4e0e\u6bcf\u4e2a\u5927\u4e8e 10pF \u7684\u79ef\u5206\u7535\u5bb9\u4e32\u8054\u3002<\/p>\n
\n\t\uff083\uff09\u5728\u53cd\u9988\u73af\u5916\u4e0d\u8981\u4f7f\u7528\u4e3b\u52a8\u7535\u8def\u8fdb\u884c\u6ee4\u6ce2\u6216\u63a7\u5236 EMC<\/u> \u7684 RF \u5e26\u5bbd\uff0c\u800c\u53ea\u80fd\u4f7f\u7528\u88ab\u52a8\u5143\u4ef6\uff08\u6700\u597d\u4e3a RC \u7535\u8def\uff09\u3002\u4ec5\u4ec5\u5728\u8fd0\u653e\u7684\u5f00\u73af\u589e\u76ca\u6bd4\u95ed\u73af\u589e\u76ca\u5927\u7684\u9891\u7387\u4e0b\uff0c\u79ef\u5206\u53cd\u9988\u65b9\u6cd5\u624d\u6709\u6548\u3002\u5728\u66f4\u9ad8\u7684\u9891\u7387\u4e0b\uff0c\u79ef\u5206\u7535\u8def\u4e0d\u80fd\u63a7\u5236\u9891\u7387\u54cd\u5e94\u3002<\/p>\n
\n\t\uff084\uff09\u4e3a\u4e86\u83b7\u5f97\u4e00\u4e2a\u7a33\u5b9a\u7684\u7ebf\u6027\u7535\u8def\uff0c\u6240\u6709\u8fde\u63a5\u5fc5\u987b\u4f7f\u7528\u88ab\u52a8\u6ee4\u6ce2\u5668<\/u>\u6216\u5176\u4ed6\u6291\u5236\u65b9\u6cd5\uff08\u5982\u5149\u7535\u9694\u79bb\uff09\u8fdb\u884c\u4fdd\u62a4\u3002<\/p>\n
\n\t\uff085\uff09\u4f7f\u7528 EMC \u6ee4\u6ce2\u5668\uff0c\u5e76\u4e14\u4e0e IC \u76f8\u5173\u7684\u6ee4\u6ce2\u5668\u90fd\u5e94\u8be5\u548c\u672c\u5730\u7684 0V \u53c2\u8003\u5e73\u9762\u8fde\u63a5\u3002<\/p>\n
\n\t\uff086\uff09\u5728\u5916\u90e8\u7535\u7f06\u7684\u8fde\u63a5\u5904\u5e94\u8be5\u653e\u7f6e\u8f93\u5165\u8f93\u51fa\u6ee4\u6ce2\u5668\uff0c\u4efb\u4f55\u5728\u6ca1\u6709\u5c4f\u853d\u7cfb\u7edf\u5185\u90e8\u7684\u5bfc\u7ebf\u8fde\u63a5\u5904\u90fd\u9700\u8981\u6ee4\u6ce2\uff0c\u56e0\u4e3a\u5b58\u5728\u5929\u7ebf\u6548\u5e94\u3002\u53e6\u5916\uff0c\u5728\u5177\u6709\u6570\u5b57\u4fe1\u53f7\u5904\u7406\u6216\u5f00\u5173<\/u>\u6a21\u5f0f\u7684\u53d8\u6362\u5668\u7684\u5c4f\u853d\u7cfb\u7edf\u5185\u90e8\u7684\u5bfc\u7ebf\u8fde\u63a5\u5904\u4e5f\u9700\u8981\u6ee4\u6ce2\u3002<\/p>\n
\n\t\uff087\uff09\u5728\u6a21\u62df IC \u7684\u7535\u6e90\u548c\u5730\u53c2\u8003\u5f15\u811a\u9700\u8981\u9ad8\u8d28\u91cf\u7684 RF \u53bb\u8026\uff0c\u8fd9\u4e00\u70b9\u4e0e\u6570\u5b57 IC \u4e00\u6837\u3002\u4f46\u662f\u6a21\u62df IC \u901a\u5e38\u9700\u8981\u4f4e\u9891\u7684\u7535\u6e90\u53bb\u8026\uff0c\u56e0\u4e3a\u6a21\u62df\u5143\u4ef6\u7684\u7535\u6e90\u566a\u58f0\u6291\u5236\u6bd4\uff08PSRR\uff09\u5728\u9ad8\u4e8e 1KHz \u540e\u589e\u52a0\u5f88\u5c11\u3002\u5728\u6bcf\u4e2a\u8fd0\u653e\u3001\u6bd4\u8f83\u5668<\/u>\u548c\u6570\u636e\u8f6c\u6362\u5668\u7684\u6a21\u62df\u7535\u6e90\u8d70\u7ebf\u4e0a\u90fd\u5e94\u8be5\u4f7f\u7528 RC \u6216 LC \u6ee4\u6ce2\u3002\u7535\u6e90\u6ee4\u6ce2\u5668\u7684\u62d0\u89d2\u9891\u7387\u5e94\u8be5\u5bf9\u5668\u4ef6\u7684 PSRR \u62d0\u89d2\u9891\u7387\u548c\u659c\u7387\u8fdb\u884c\u8865\u507f\uff0c\u4ece\u800c\u5728\u6574\u4e2a\u5de5\u4f5c\u9891\u7387\u8303\u56f4\u5185\u83b7\u5f97\u6240\u671f\u671b\u7684 PSRR \u3002<\/p>\n
\n\t\uff088\uff09\u5bf9\u4e8e\u9ad8\u901f\u6a21\u62df\u4fe1\u53f7\uff0c\u6839\u636e\u5176\u8fde\u63a5\u957f\u5ea6\u548c\u901a\u4fe1\u7684\u6700\u9ad8\u9891\u7387\uff0c\u4f20\u8f93\u7ebf\u6280\u672f\u662f\u5fc5\u9700\u7684\u3002\u5373\u4f7f\u662f\u4f4e\u9891\u4fe1\u53f7\uff0c\u4f7f\u7528\u4f20\u8f93\u7ebf\u6280\u672f\u4e5f\u53ef\u4ee5\u6539\u5584\u5176\u6297\u5e72\u6270\u6027\uff0c\u4f46\u662f\u6ca1\u6709\u6b63\u786e\u5339\u914d\u7684\u4f20\u8f93\u7ebf\u5c06\u4f1a\u4ea7\u751f\u5929\u7ebf\u6548\u5e94\u3002<\/p>\n
\n\t\uff089\uff09\u907f\u514d\u4f7f\u7528\u9ad8\u963b\u6297\u7684\u8f93\u5165\u6216\u8f93\u51fa\uff0c\u5b83\u4eec\u5bf9\u4e8e\u7535\u573a\u662f\u975e\u5e38\u654f\u611f\u7684\u3002<\/p>\n
\n\t\uff0810\uff09\u7531\u4e8e\u5927\u90e8\u5206\u7684\u8f90\u5c04\u662f\u7531\u5171\u6a21\u7535\u538b\u548c\u7535\u6d41\u4ea7\u751f\u7684\uff0c\u5e76\u4e14\u56e0\u4e3a\u5927\u90e8\u5206\u73af\u5883\u7684\u7535\u78c1\u5e72\u6270\u90fd\u662f\u5171\u6a21\u95ee\u9898\u4ea7\u751f\u7684\uff0c\u56e0\u6b64\u5728\u6a21\u62df\u7535\u8def\u4e2d\u4f7f\u7528\u5e73\u8861\u7684\u53d1\u9001\u548c\u63a5\u6536\uff08\u5dee\u5206\u6a21\u5f0f\uff09\u6280\u672f\u5c06\u5177\u6709\u5f88\u597d\u7684 EMC \u6548\u679c\uff0c\u800c\u4e14\u53ef\u4ee5\u51cf\u5c11\u4e32\u6270\u3002\u5e73\u8861\u7535\u8def\uff08\u5dee\u5206\u7535\u8def\uff09\u9a71\u52a8\u4e0d\u4f1a\u4f7f\u7528 0V \u53c2\u8003\u7cfb\u7edf\u4f5c\u4e3a\u8fd4\u56de\u7535\u6d41\u56de\u8def\uff0c\u56e0\u6b64\u53ef\u4ee5\u907f\u514d\u5927\u7684\u7535\u6d41\u73af\u8def\uff0c\u4ece\u800c\u51cf\u5c11 RF \u8f90\u5c04\u3002<\/p>\n
\n\t\uff0811\uff09\u6bd4\u8f83\u5668\u5fc5\u987b\u5177\u6709\u6ede\u540e\uff08\u6b63\u53cd\u9988\uff09\uff0c\u4ee5\u9632\u6b62\u56e0\u4e3a\u566a\u58f0\u548c\u5e72\u6270\u800c\u4ea7\u751f\u7684\u9519\u8bef\u7684\u8f93\u51fa\u53d8\u6362\uff0c\u4e5f\u53ef\u4ee5\u9632\u6b62\u5728\u65ad\u8def\u70b9\u4ea7\u751f\u632f\u8361\u3002\u4e0d\u8981\u4f7f\u7528\u6bd4\u9700\u8981\u901f\u5ea6\u66f4\u5feb\u7684\u6bd4\u8f83\u5668\uff08\u5c06 dV\/dt \u4fdd\u6301\u5728\u6ee1\u8db3\u8981\u6c42\u7684\u8303\u56f4\u5185\uff0c\u5c3d\u53ef\u80fd\u4f4e\uff09\u3002<\/p>\n
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1. \u4e00\u822c\u89c4\u5219 1.1 PCB\u677f \u4e0a\u9884\u5212\u5206\u6570\u5b57\u3001\u6a21\u62df\u3001DAA\u4fe1\u53f7 \u5e03\u7ebf \u533a\u57df\u3002 1.2 \u6570\u5b57\u3001\u6a21\u62df \u5143\u5668\u4ef6 \u53ca\u76f8\u5e94\u8d70\u7ebf\u5c3d\u91cf\u5206\u5f00\u5e76\u653e\u7f6e\u65bc\u5404\u81ea\u7684\u5e03\u7ebf\u533a\u57df\u5185\u3002 1.3 \u9ad8\u901f\u6570\u5b57\u4fe1\u53f7\u8d70\u7ebf\u5c3d\u91cf\u77ed\u3002 1.4 \u654f\u611f\u6a21\u62df\u4fe1\u53f7<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"_links":{"self":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/2771"}],"collection":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2771"}],"version-history":[{"count":0,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/2771\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2771"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}