{"id":9731,"date":"2022-09-12T21:03:11","date_gmt":"2022-09-12T13:03:11","guid":{"rendered":"http:\/\/www.szryc.com\/?p=9731"},"modified":"2022-09-12T21:03:11","modified_gmt":"2022-09-12T13:03:11","slug":"%e7%94%b5%e6%ba%90%e6%8a%91%e5%88%b6%e6%af%94psrr%e7%9a%84%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=9731","title":{"rendered":"\u7535\u6e90\u6291\u5236\u6bd4(PSRR)\u7684\u57fa\u7840\u77e5\u8bc6"},"content":{"rendered":"

\u7535\u6e90<\/u>\u6291\u5236\u6bd4 \uff0c\u82f1\u6587\u540dPower Supply Rejec<\/u>TI<\/u>on RaTIo\uff0c\u7b80\u79f0PSRR\uff0c\u5b83\u63cf\u8ff0\u4e86\u7535\u8def<\/u>\u6291\u5236\u4efb\u4f55\u7535\u6e90\u53d8\u5316\u4f20\u9012\u5230\u5176\u8f93\u51fa\u4fe1\u53f7\u7684\u80fd\u529b\uff0c\u901a\u5e38\u4ee5dB\u4e3a\u5355\u4f4d\u8fdb\u884c\u6d4b\u91cf<\/u>\uff0c\u7528\u6765\u63cf\u8ff0\u8f93\u51fa\u4fe1\u53f7\u53d7\u7535\u6e90\u5f71\u54cd\u3002\u5b83\u6700\u5e38\u4e0e\u8fd0\u7b97\u653e\u5927\u5668<\/u>\u00a0(op amps)\u3001DC-DC\u8f6c\u6362\u5668\u3001\u7ebf\u6027\u7a33\u538b\u5668<\/u>\u548c\u4f4e\u538b\u5dee\u7a33\u538b\u5668 (LDO<\/u>) \u7684\u4f7f\u7528\u76f8\u5173\u3002<\/p>\n

\u5bf9\u4e8e\u8fd0\u7b97\u653e\u5927\u5668<\/u>\uff0c\u7535\u6e90\u6291\u5236\u6bd4\u63cf\u8ff0\u4e86\u653e\u5927\u5668\u5728\u5176\u76f4\u6d41\u7535\u6e90\u7535\u538b\u53d8\u5316\u65f6\u4fdd\u6301\u5176\u8f93\u51fa\u7535\u538b\u7684\u80fd\u529b\u3002\u4e0e\u6b64\u540c\u65f6\uff0c\u7535\u6e90\u6291\u5236\u6bd4\u91cf\u5316\u4e86\u5728\u7535\u6e90\u8f6c\u6362\u5e94\u7528\u4e2d\u963b\u6b62\u6765\u81ea\u8f93\u5165\u6e90\u7684\u7eb9\u6ce2\u7535\u538b\u7684\u80fd\u529b\u3002<\/p>\n

\u7406\u60f3\u8fd0\u7b97\u653e\u5927\u5668\u7684PSRR\u4e3a\u96f6\u3002\u4f46\u662f\uff0c\u5b9e\u9645\u8fd0\u7b97\u653e\u5927\u5668\u7684PSRR\u4e0e\u9891\u7387\u6709\u5173\u3002\u4fe1\u53f7\u9891\u7387\u8d8a\u9ad8\uff0cPSRR\u8d8a\u4f4e\u3002PSRR\u901a\u5e38\u6839\u636e\u8f93\u5165\u6765\u8861\u91cf\uff0c\u4f46\u6ca1\u6709\u884c\u4e1a\u6807\u51c6\u3002\u4f8b\u5982\uff0c\u5f53\u6839\u636e\u8f93\u5165\u6307\u5b9a\u65f6\uff0cPSRR=10log (\u0394Vsupply2Av2 )\/\u0394Vout2 )\uff0c\u5176\u4e2d Av=\u7535\u538b\u589e\u76ca\u3002PSRR\u8d8a\u5927\uff0c\u8f93\u51fa\u4fe1\u53f7\u53d7\u5230\u7535\u6e90\u7684\u5f71\u54cd\u4e5f\u5c31\u8d8a\u5c0f\uff0c\u6240\u4ee5\u540c\u60c5\u51b5\u4e0b\u5e0c\u671b\u8fd0\u653e\u7684PSRR\u8d8a\u5927\u8d8a\u597d\u3002<\/p>\n

\u5728\u4f4e\u566a\u58f0\u548c\u7cbe\u5bc6\u5e94\u7528\u4e2d\uff0cPSRR\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u539f\u56e0\u6709\u51e0\u4e2a\u3002\u9996\u5148\uff0c\u8fd0\u7b97\u653e\u5927\u5668\u7684\u8f93\u51fa\u662f\u7535\u6e90\u4ee5\u53ca\u8f93\u5165\u503c\u7684\u51fd\u6570\uff0c\u5982\u679c\u653e\u5927\u7ea7\u5bf9\u901a\u8fc7\u7535\u6e90\u8f93\u5165\u7684\u4fe1\u53f7\u8fc7\u4e8e\u654f\u611f\uff0c\u5219\u53ef\u80fd\u4f1a\u53d1\u751f\u4e0d\u9700\u8981\u7684\u632f\u8361\u3002\u6b64\u5916\uff0c\u8f83\u5dee\u7684PSRR\u4f1a\u5bfc\u81f4\u6548\u7387\u964d\u4f4e\u3002\u6240\u4ee5\uff0c\u826f\u597d\u7684PSRR\u5728\u9700\u8981\u6700\u4f4e\u529f\u8017\u7684\u7cbe\u5bc6\u6c7d\u8f66\u3001\u5de5\u4e1a\u548c\u533b\u7597\u8bbe\u8ba1\u4e2d\u975e\u5e38\u91cd\u8981\u3002<\/p>\n

\"poYBAGMa7L6AJ5-rAAAvqolG_FQ220\"<\/p>\n

\u8fd0\u7b97\u653e\u5927\u5668\u7684PSRR<\/strong><\/p>\n

\u4f17\u6240\u5468\u77e5\uff0cPSRR\u5728\u8bbe\u8ba1\u4e2d\u81f3\u5173\u91cd\u8981\u65f6\uff0c\u56e0\u6b64\u8bbe\u8ba1\u4eba\u5458\u5e94\u8be5\u72ec\u7acb\u4e8e\u6570\u636e\u8868\u6d4b\u91cf\u5176\u503c\u3002\u5236\u9020\u5546\u7ed9\u51fa\u7684\u6570\u636e\u786e\u5b9e\u5f88\u597d\u770b\uff0c\u4f46\u4e0d\u540c\u7684\u8bbe\u8ba1\u9700\u6c42\u5bf9PSRR\u7684\u8981\u6c42\u4e5f\u662f\u4e0d\u5c3d\u76f8\u540c\u3002\u5c24\u5176\u662f\u5728\u8f83\u9ad8\u9891\u7387\u4e0b(\u5982\u4e0b\u56fe)\uff0c\u6d4b\u91cfPSRR\u901a\u5e38\u5728+Vcc\u548c-Vee\u4e0a\u4f7f\u7528\u5e73\u8861\u4fe1\u53f7\uff0c\u4ee5\u9632\u6b62\u5171\u6a21\u6548\u5e94\u5f71\u54cdPSRR\u6d4b\u91cf\u3002<\/p>\n

\u4f46\u662f\uff0c\u5b9e\u9645\u7535\u8def\u8bbe\u8ba1<\/u>\u4e2d\u53ef\u80fd\u5e76\u4e0d\u603b\u662f\u5b58\u5728\u5e73\u8861\u4fe1\u53f7\uff0c\u6240\u4ee5\u8fd9\u4f1a\u5f71\u54cdPSRR\u3002\u6b64\u5916\uff0cPSRR\u4e0e\u4fe1\u53f7\u5e45\u5ea6\u6709\u5173\u3002\u5728\u8bb8\u591a\u5e94\u7528\u7535\u8def\u4e2d\uff0c\u7535\u6e90\u7ebf\u4e0a\u7684\u7eb9\u6ce2\u548c\u566a\u58f0\u5c06\u8fdc\u4f4e\u4e8e\u7528\u4e8e\u5f00\u53d1\u6570\u636e\u8868\u4e2d\u4f7f\u7528\u7684\u6d4b\u8bd5<\/u>\u6570\u636e\u7684\u7eb9\u6ce2\u548c\u566a\u58f0\u3002\u5728\u5b9e\u9645\u7535\u8def\u5b9e\u73b0\u4e2d\uff0c\u7535\u8def\u589e\u76ca\u548cPCB<\/u>\u5bc4\u751f\u53c2\u6570\u4e5f\u4f1a\u5f71\u54cdPSRR\u3002<\/p>\n

\"poYBAGMa7MeAT25nAACEzdzKFpc368\"<\/p>\n

(\u6570\u636e\u8868\u4e2d\u8fd0\u7b97\u653e\u5927\u5668\u7684PSSR(\u5de6)\u548c\u5b9e\u6d4b\u503c(\u53f3)\u6bd4\u8f83)<\/p>\n

LDO\u4e2d\u7684PSRR<\/strong><\/p>\n

\u5728LDO\u4e2d\uff0cPSRR\u6709\u65f6\u79f0\u4e3a\u7535\u6e90\u7535\u538b\u6291\u5236\u6bd4 (SVR<\/u>R)\uff0c\u7528\u4e8e\u8861\u91cfLDO\u5728\u5404\u79cd\u9891\u7387\u4e0b\u6291\u5236\u8f93\u5165\u566a\u58f0\u7684\u80fd\u529b(\u5982\u4e0b\u56fe\u6240\u793a)\u3002<\/p>\n

PSRR\u53ef\u80fd\u662f\u97f3\u9891<\/u>\u3001\u5c04\u9891<\/u>\u00a0(RF<\/u>) \u4ee5\u53ca\u533b\u7597\u548c\u5176\u4ed6\u4f20\u611f\u5668<\/u>\u5e94\u7528\u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u53c2\u6570\u3002\u8f93\u5165\u7eb9\u6ce2\u53ef\u80fd\u6709\u591a\u79cd\u6765\u6e90\uff0c\u5305\u62ec\u6765\u81ea\u7535\u6e90\u768450\/60Hz\u5e72\u6270\u3001\u6765\u81ea\u4e0a\u6e38DC\/DC<\/u>\u5f00\u5173<\/u>\u8f6c\u6362\u5668\u7684\u8f93\u51fa\u7eb9\u6ce2\uff0c\u6216\u6765\u81eaPCB\u4e0a\u4e0d\u540c\u7535\u8def\u5757\u8026\u5408<\/u>\u7684\u7eb9\u6ce2\u3002PSRR\u901a\u5e38\u572810Hz\u52301MHz\u6216\u66f4\u9ad8\u9891\u7387\u8303\u56f4\u5185\u6d4b\u91cf\u3002\u5bf9\u4e8e\u7535\u6e90\u8f6c\u6362\u5e94\u7528\uff0cPSRR=20 log(\u7eb9\u6ce2\u8f93\u5165\/\u7eb9\u6ce2\u8f93\u51fa)\u3002<\/p>\n

\"pYYBAGMa7NGAWu0FAABKlHjUGGY592\"<\/p>\n

(\u9ad8PSSR\u4f7fLDO\u80fd\u591f\u5145\u5f53\u566a\u58f0\u6ee4\u6ce2\u5668\uff0c\u4ee5\u9632\u6b62\u8f93\u5165\u4e0a\u7684\u7eb9\u6ce2\u548c\u566a\u58f0\u8026\u5408\u5230\u8f93\u51fa)<\/p>\n

LDO PSRR\u5305\u62ec\u4e09\u4e2a\u9891\u7387\u533a\u57df(\u5982\u4e0b\u56fe\u6240\u793a)\u3002\u5728\u8f83\u4f4e\u9891\u7387\u533a\u57df\uff0c\u76f4\u5230\u5e26\u9699\u6ee4\u6ce2\u5668<\/u>\u7684\u6eda\u964d\u9891\u7387\uff0cPSRR\u7531\u5f00\u73af\u589e\u76ca\u548c\u5e26\u9699\u56e0\u5b50\u7684\u7ec4\u5408\u4ea7\u751f\u3002\u5728\u5e26\u9699\u6ee4\u6ce2\u5668\u7684\u6eda\u964d\u9891\u7387\u4e4b\u4e0a\uff0c\u76f4\u5230\u5355\u4f4d\u589e\u76ca\u9891\u7387\uff0cPSRR\u4e3b\u8981\u662fLDO\u5f00\u73af\u589e\u76ca\u7684\u7ed3\u679c\u3002<\/p>\n

\u9ad8\u4e8e\u5355\u4f4d\u589e\u76ca\u9891\u7387\u65f6\uff0c\u5728\u4e0b\u56fe\u533a\u57df3\u4e2d\uff0cPSRR\u53d7\u8f93\u51fa\u7535\u5bb9<\/u>\u652f\u914d\uff0c\u53d7Vin\u548cVout\u4e4b\u95f4\u5bc4\u751f\u6548\u5e94\u7684\u5f71\u54cd\u8f83\u5c0f\u3002\u4f7f\u7528\u5177\u6709\u8f83\u4f4e\u7b49\u6548\u4e32\u8054\u7535\u963b<\/u>\u7684\u8f83\u5927\u8f93\u51fa\u7535\u5bb9\u5668<\/u>\u53ef\u4ee5\u63d0\u9ad8\u533a\u57df3\u7684PSRR\uff0c\u4f46\u4e5f\u53ef\u80fd\u4f1a\u5f71\u54cd\u8f83\u4f4e\u9891\u7387\u4e0b\u7684PSRR\u3002\u867d\u7136\u53ef\u4ee5\u4f7f\u7528\u5177\u6709\u66f4\u9ad8PSRR\u7684LDO\u6765\u4ee3\u66ff\u66f4\u5927\u8f93\u51fa\u7535\u5bb9\u5668\uff0c\u4f46\u662f\u5177\u6709\u9ad8PSRR\u989d\u5b9a\u503c\u7684LDO\u5f80\u5f80\u9700\u8981\u66f4\u9ad8\u7684\u7535\u6e90\u7535\u6d41\uff0c\u8fd9\u6837\u6bd4\u8f83\u5bb9\u6613\u53d7\u5230\u632f\u8361\u7684\u5f71\u54cd\u3002<\/p>\n

\"pYYBAGMa7NuACkmVAAELcW2ViXs558\"<\/p>\n

(\u4e0d\u540c\u539f\u56e0\u5bfc\u81f4LDO PSRR\u7684\u51fa\u73b0)<\/p>\n

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LDO\u4e0eDC-DC\u8f6c\u6362\u5668\u7684\u914d\u5408\u4f7f\u7528<\/strong><\/p>\n

\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cLDO\u548c\u5f00\u5173\u6a21\u5f0fDC-DC\u8f6c\u6362\u5668\u7684\u7ec4\u5408\u53ef\u4ee5\u4e3a\u566a\u58f0\u654f\u611f\u8bbe\u5907\u63d0\u4f9b\u6700\u4f73\u7535\u6e90\u3002\u5f53\u566a\u58f0\u4e0d\u662f\u4e3b\u8981\u8003\u8651\u56e0\u7d20\u65f6\uff0c\u4f8b\u5982\u4e3a\u6570\u5b57\u7535\u8def<\/u>\u4f9b\u7535\u65f6\uff0c\u4ec5\u4f7f\u7528DC-DC\u7684\u89e3\u51b3\u65b9\u6848\u53ef\u63d0\u4f9b\u66f4\u9ad8\u7684\u6548\u7387(\u76f8\u540c\u5c3a\u5bf8\u548c\u6210\u672c\u60c5\u51b5\u4e0b)\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u4ec5\u4f7f\u7528LDO\u53ef\u4ee5\u63d0\u4f9b\u4e00\u79cd\u5c0f\u578b\u3001\u7b80\u5355\u4e14\u6210\u672c\u5408\u7406\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u4f46\u6548\u7387\u8f83\u4f4e\u3002<\/p>\n

\u4e0e\u4ec5\u4f7f\u7528LDO\u7684\u65b9\u6cd5\u76f8\u6bd4\uff0c\u4f7f\u7528\u5177\u6709DC-DC\u8f6c\u6362\u5668\u7684\u9ad8PSRR LDO\u53ef\u4ee5\u89e3\u51b3\u6548\u7387\u66f4\u9ad8\u7684\u95ee\u9898\uff0c\u5e76\u4e14\u4e0e\u4f7f\u7528\u6ca1\u6709LDO\u7684DC-DC\u8f6c\u6362\u5668\u76f8\u6bd4\uff0c\u566a\u58f0\u66f4\u4f4e\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5b83\u4ea7\u751f\u7684\u566a\u58f0\u4e0e\u4ec5\u4f7f\u7528LDO\u7684\u89e3\u51b3\u65b9\u6848\u4e00\u6837\u4f4e\u3002\u4f8b\u5982\uff0c\u5728\u5177\u670912Vdc\u7535\u6e90\u603b\u7ebf\u7684\u5206\u5e03\u5f0f\u7535\u6e90\u67b6\u6784\u4e2d\uff0cDC-DC\u8f6c\u6362\u5668\u53ef\u7528\u4e8e\u5c06\u5927\u5bb9\u91cf\u914d\u7535\u7535\u538b\u964d\u4f4e\u81f33.6VDC\uff0c\u5e76\u9988\u5165\u9ad8PSRR LDO\u4ee5\u63d0\u4f9b3.3Vdc\u4ee5\u5411\u566a\u58f0\u654f\u611f\u7535\u8def\u5143\u4ef6\u4f9b\u7535\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff0cLDO\u8f93\u51fa\u7684\u7eb9\u6ce2\u5728\u51e0\u5341\u6beb\u4f0f\u8303\u56f4\u5185\uff0c\u8fdc\u4f4e\u4e8eDC-DC\u8f6c\u6362\u5668\u7684\u8f93\u51fa\u7eb9\u6ce2\u3002<\/p>\n

\"pYYBAGMa7OWAFSYjAAD08dlo7vg142\"<\/p>\n

(DC-DC\u8f6c\u6362\u5668(\u9876\u90e8)\u4e0e\u9ad8PSRR LDO(\u5e95\u90e8)\u76f8\u7ed3\u5408\u53ef\u63d0\u4f9b\u826f\u597d\u7684\u7aef\u5230\u7aef\u6548\u7387\u548c\u4f4e\u7eb9\u6ce2)<\/p>\n

\u603b\u7ed3<\/strong><\/p>\n

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