{"id":2379,"date":"2019-04-26T03:16:50","date_gmt":"2019-04-26T03:16:50","guid":{"rendered":""},"modified":"2019-04-26T11:17:13","modified_gmt":"2019-04-26T03:17:13","slug":"emi%e6%8a%97%e5%b9%b2%e6%89%b0%e8%ae%be%e8%ae%a1%e4%b8%8e%e4%bd%8e%e5%99%aa%e5%a3%b0%e7%94%b5%e8%b7%af%e8%ae%be%e8%ae%a1%e7%9a%84%e6%96%b9%e6%b3%95%e6%9c%89%e5%93%aa%e4%ba%9b","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=2379","title":{"rendered":"EMI\u6297\u5e72\u6270\u8bbe\u8ba1\u4e0e\u4f4e\u566a\u58f0\u7535\u8def\u8bbe\u8ba1\u7684\u65b9\u6cd5\u6709\u54ea\u4e9b"},"content":{"rendered":"

\n\t\u4e00\u3001EMI<\/u> \/ \u6297\u5e72\u6270\u8bbe\u8ba1<\/p>\n

\n\tEMI \u662f\u5f53\u4eca\u8bb8\u591a\u8bbe\u8ba1\u4eba\u5458\u6240\u9762\u4e34\u7684\u4e00\u9879\u91cd\u5927\u6311\u6218\u3002\u5982\u679c\u4e0d\u80fd\u987a\u5229\u901a\u8fc7 EMI \u6d4b\u8bd5<\/u>\uff0c\u5219\u5c06\u5bfc\u81f4\u9879\u76ee\u6210\u672c\u663e\u8457\u589e\u52a0\u548c\u8fdb\u5ea6\u8fdf\u7f13\uff0c\u56e0\u6b64\u9ad8\u6c34\u5e73\u7684\u5de5\u7a0b\u5e08\u4f1a\u5728\u8bbe\u8ba1\u7684\u65e9\u671f\u5bfb\u6c42\u51cf\u4f4e EMI \u7684\u65b9\u6cd5\u3002\u56e0\u4e3a\u5f00\u5173\u7a33\u538b\u5668<\/u>\u5177\u6709\u9ad8\u80fd\u91cf\u6548\u7387\uff0c\u6240\u4ee5\u8d8a\u6765\u8d8a\u591a\u4eba\u91c7\u7528\uff0c\u5bf9EMI \u7684\u5f71\u54cd\u4e5f\u5728\u52a0\u91cd\u3002\u4e00\u79cd\u80fd\u6709\u52a9\u4e8e\u6291\u5236\u4e0e\u5f00\u5173\u7535\u6e90<\/u>\u76f8\u5173\u4e4b EMI \u7684\u7b80\u5355\u65b9\u5f0f\u662f\u91c7\u7528\u4e00\u4e2a\u591a\u76f8\u6269\u9891\u65f6\u949f<\/u>\u3002\u4f7f\u7528\u8bf8\u5982 LTC6909 \u7b49\u5668\u4ef6\u81f3\u5c11\u80fd\u591f\u4ee5\u4e09\u79cd\u65b9\u5f0f\u63d0\u4f9b\u5e2e\u52a9\u3002\u9996\u5148\uff0c\u7845\u632f\u8361\u5668<\/u> \uff08\u4f8b\u5982\uff1aLTC6909\uff09 \u53ef\u7528\u4e8e\u5c06\u7a33\u538b\u5668\u7684\u5f00\u5173\u9891\u7387\u548c\u6700\u7ec8\u7684\u57fa\u672c EMI \u9891\u7387\u8bbe\u5b9a\u5728\u67d0\u4e2a\u654f\u611f\u7684\u9891\u6bb5\u4e4b\u5916\u3002\u5176\u6b21\uff0cLTC6909 \u7684\u591a\u4e2a\u8f93\u51fa\u76f8\u4f4d\u53ef\u7528\u4e8e\u5728\u4e0d\u540c\u7684\u76f8\u4f4d\u5bf9\u4e0d\u540c\u7684\u7a33\u538b\u5668\u8fdb\u884c\u5f00\u5173\u64cd\u4f5c\uff0c\u56e0\u800c\u964d\u4f4e\u4e86\u4f1a\u4ea7\u751f EMI \u7684\u5cf0\u503c\u5f00\u5173\u7535\u6d41<\/u>\u3002\u8bf8\u5982 LTC6909 \u7b49\u4ea7\u54c1\u6240\u63d0\u4f9b\u7684\u7b2c\u4e09\u79cd\u6539\u5584\u662f\u8fd0\u7528\u6269\u9891\u8c03\u9891\u6280\u672f \uff08SSFM\uff09 \u5c06\u5f00\u5173\u7535\u6d41\u6563\u5e03\u4e8e\u65f6\u57df\u4e4b\u4e2d\u3002\u6b64\u9879\u6280\u672f\u4e0d\u5141\u8bb8\u8f90\u5c04\u80fd\u91cf\u5728\u4efb\u4f55\u63a5\u6536\u5668\u7684\u9891\u6bb5\u5185\u957f\u65f6\u95f4\u5730\u505c\u7559\uff0c\u4ece\u800c\u6539\u5584\u4e86 EMI\u3002<\/p>\n

\n\t <\/div>\n

\n\t\"EMI\u6297\u5e72\u6270\u8bbe\u8ba1\u4e0e\u4f4e\u566a\u58f0\u7535\u8def\u8bbe\u8ba1\u7684\u65b9\u6cd5\u6709\u54ea\u4e9b\"
\n\t <\/p>\n

\n\t\u4e8c\u3001\u4f4e\u566a\u58f0\u7535\u8def<\/u>\u8bbe\u8ba1<\/p>\n

\n\t\u566a\u58f0\u662f\u9ad8\u51c6\u786e\u5ea6\u7cfb\u7edf\u7684\u5927\u654c\u3002\u540c\u65f6\uff0c\u5b83\u4e5f\u662f\u4e00\u4e2a\u6d89\u53ca\u8303\u56f4\u5f88\u5927\u7684\u8bdd\u9898\u3002\u8fd9\u91cc\u6211\u5e76\u4e0d\u6253\u7b97\u8be6\u7ec6\u5730\u9610\u8ff0\u8fd9\u4e00\u8bdd\u9898\uff0c\u800c\u662f\u5c31\u7535\u5b50\u7535\u8def\u4e2d\u7684\u566a\u58f0\u4e3e\u4e09\u4e2a\u4f8b\u5b50\uff0c\u5e76\u8bf4\u660e\u65b0\u4ea7\u54c1\u662f\u5982\u4f55\u80fd\u591f\u6709\u52a9\u4e8e\u5c3d\u91cf\u6291\u5236\u8fd9\u4e9b\u566a\u58f0\u3002\u5982\u9700\u5168\u9762\u4e86\u89e3\u7535\u538b\u566a\u58f0\u3001\u7535\u6d41\u566a\u58f0\u3001\u7535\u963b\u5668<\/u>\u566a\u58f0\u53ca\u5176\u5728\u653e\u5927\u5668<\/u>\u7535\u8def\u4e2d\u7684\u5173\u7cfb\u3002<\/p>\n

\n\t1. \u9ad8\u901f\u6570\u636e\u8f6c\u6362\u7535\u8def\u4e2d\u7684\u653e\u5927\u5668\u566a\u58f0<\/p>\n

\n\t\u5728\u6a21\u6570\u8f6c\u6362\u7535\u8def\u4e2d\uff0c\u5047\u5982\u9009\u62e9\u4e86\u4e00\u4e2a\u5177\u6709\u8db3\u591f\u9ad8\u5206\u8fa8\u7387\u7684 ADC<\/u>\uff0c\u5219\u91cf\u5316\u566a\u58f0\u5c06\u4e0d\u518d\u662f\u4e3b\u5bfc\u56e0\u7d20\u3002\u8bbe\u8ba1\u4eba\u5458\u56e0\u800c\u53ef\u628a\u5176\u6ce8\u610f\u529b\u8f6c\u79fb\u81f3\u5176\u4ed6\u7684\u566a\u58f0\u6e90\uff0c\u5305\u62ec\u653e\u5927\u5668\u566a\u58f0\u3001\u7535\u538b\u57fa\u51c6\u566a\u58f0\u548c\u65f6\u949f\u76f8\u4f4d\u566a\u58f0\u7b49\uff0c\u6240\u6709\u8fd9\u4e9b\u566a\u58f0\u6e90\u5747\u4f1a**\u603b\u4f53\u7cfb\u7edf\u51c6\u786e\u5ea6\u3002\u5f53\u9009\u62e9\u653e\u5927\u5668\u65f6\uff0c\u9891\u7387\u8303\u56f4\u662f\u91cd\u8981\u56e0\u7d20\u3002\u5728 1\/f \u566a\u58f0\u8f6c\u6298\u9891\u7387\u4ee5\u4e0a\uff0c\u5bbd\u5e26\u7535\u538b\u566a\u58f0\u4ee5 nV\/√Hz \u4e3a\u5ea6\u91cf\u5355\u4f4d\u3002\u5e26\u5bbd\u8d8a\u5bbd\uff0c\u5219\u566a\u58f0\u8d8a\u5927\uff0c\u56e0\u6b64\u5229\u7528\u65e0\u6e90\u6216\u4f4e\u566a\u58f0\u6709\u6e90\u6ee4\u6ce2\u5668<\/u>\u5bf9\u4fe1\u53f7\u5b9e\u65bd\u6ee4\u6ce2\u5904\u7406\u662f\u4f4e\u566a\u58f0\u8bbe\u8ba1\u7684\u4e00\u4e2a\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u3002\u5b9e\u9645\u4e0a\u8bf4\u6765\uff0c\u653e\u5927\u5668\u7684\u566a\u58f0\u8bbe\u5b9a\u4e86\u6700\u5c0f\u53ef\u5206\u8fa8\u4fe1\u53f7\uff0c\u800c\u5931\u771f\u5219\u51b3\u5b9a\u4e86\u53ef\u4ee5\u51c6\u786e\u6d4b\u91cf\u7684\u6700\u5927\u4fe1\u53f7\u5e45\u5ea6\u3002\u566a\u58f0\u4e0e\u5931\u771f\u4e00\u8d77\u786e\u5b9a\u4e86\u52a8\u6001\u8303\u56f4\u3002\u6240\u4ee5\uff0c\u5bf9\u4e8e\u9ad8\u5206\u8fa8\u7387 ADC \u5e94\u7528\u800c\u8a00\uff0c\u9009\u62e9\u4e00\u6b3e\u4f4e\u566a\u58f0\u548c\u4f4e\u5931\u771f\u7684 ADC \u9a71\u52a8\u5668\u81f3\u5173\u7d27\u8981\u3002LTC6409 \u5c31\u662f\u8fd9\u6837\u7684\u4e00\u4e2a\u4ea7\u54c1\u5b9e\u4f8b\uff0c\u8be5\u5668\u4ef6\u5177\u6709 1.1nV\/√Hz \u7684\u5bbd\u5e26\u7535\u538b\u566a\u58f0\u3002\u518d\u52a0\u4e0a\u5728 100MHz \u7684 88dB \u65e0\u5bc4\u751f\u52a8\u6001\u8303\u56f4SFDR\uff0c\u53ef\u63d0\u4f9b\u9002\u5408\u9ad8\u901f 14 \u4f4d ADC \u7684\u5bbd\u52a8\u6001\u8303\u56f4\u9a71\u52a8\u80fd\u529b\u3002\u4f8b\u5982\uff1a\u5f53\u4ee5\u4e00\u4e2a 150Msps \u7684\u91c7\u6837\u901f\u7387\u5411 14 \u4f4d LTC2262-14 \u63d0\u4f9b\u4e00\u4e2a DC \u8026\u5408<\/u>\u5355\u7aef 70MHz \u9a71\u52a8\u8f93\u5165\u65f6\uff0c\u6240\u4ea7\u751f\u7684 SNR \u548c SFDR \u5206\u522b\u4e3a 71.1dB \u548c 81.6dB\u3002<\/p>\n

\n\t2. \u7535\u538b\u57fa\u51c6\u566a\u58f0<\/p>\n

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