{"id":15379,"date":"2025-06-22T12:49:17","date_gmt":"2025-06-22T12:49:17","guid":{"rendered":"https:\/\/sistc.com\/?p=15379"},"modified":"2025-06-22T12:49:19","modified_gmt":"2025-06-22T12:49:19","slug":"blog-selecting-op-amp-for-mems-microphone-preamps","status":"publish","type":"post","link":"https:\/\/sistc.com\/zh\/blog-selecting-op-amp-for-mems-microphone-preamps\/","title":{"rendered":"\u4e3a MEMS \u9ea6\u514b\u98ce\u524d\u7f6e\u653e\u5927\u5668\u5e94\u7528\u9009\u62e9\u5408\u9002\u7684\u8fd0\u7b97\u653e\u5927\u5668"},"content":{"rendered":"<p>\u5728\u97f3\u9891\u7cfb\u7edf\u8bbe\u8ba1\u4e2d\uff0c\u9ad8\u8d28\u91cf <strong>\u524d\u7f6e\u653e\u5927\u5668\u7535\u8def<\/strong> \u524d\u7f6e\u653e\u5927\u5668\u5bf9\u4e8e\u786e\u4fdd MEMS \u9ea6\u514b\u98ce\u7684\u4fe1\u53f7\u5728\u4f20\u9001\u5230 ADC \u6216\u4e0b\u6e38\u5904\u7406\u5668\u4e4b\u524d\u5f97\u5230\u9002\u5f53\u8c03\u8282\u81f3\u5173\u91cd\u8981\u3002\u8be5\u524d\u7f6e\u653e\u5927\u5668\u7684\u6838\u5fc3\u662f <strong>\u8fd0\u7b97\u653e\u5927\u5668<\/strong>-\u5176\u6027\u80fd\u76f4\u63a5\u5f71\u54cd\u7cfb\u7edf\u7684\u6574\u4f53\u4fe1\u53f7\u4fdd\u771f\u5ea6\u3001\u566a\u58f0\u6027\u80fd\u548c\u52a8\u6001\u8303\u56f4\u7684\u7ec4\u4ef6\u3002<\/p><p>\u672c\u6587\u63a2\u8ba8\u4e86\u4e3a\u4ee5\u4e0b\u8bbe\u5907\u9009\u62e9\u8fd0\u7b97\u653e\u5927\u5668\u65f6\u9700\u8981\u8003\u8651\u7684\u4e3b\u8981\u89c4\u683c <strong>MEMS \u9ea6\u514b\u98ce\u5e94\u7528<\/strong>\u4ee5\u53ca\u5982\u4f55\u786e\u4fdd\u4e0e\u97f3\u9891\u94fe\u8981\u6c42\u517c\u5bb9\u3002<\/p><p>\ud83d\udd17 \u63a2\u7d22 SISTC \u7684 MEMS \u9ea6\u514b\u98ce\uff1a<br><a class=\"\" href=\"https:\/\/sistc.com\/zh\/product-category\/mems-microphone\/\">https:\/\/sistc.com\/product-category\/mems-microphone\/<\/a><\/p><h2 class=\"wp-block-heading\">\u8fd0\u7b97\u653e\u5927\u5668\u5728 MEMS \u9ea6\u514b\u98ce\u8bbe\u8ba1\u4e2d\u7684\u91cd\u8981\u6027<\/h2><p>MEMS \u9ea6\u514b\u98ce\uff0c\u5982 <strong>ADMP504<\/strong> \u6216 <strong>WBC6556<\/strong> \u8f93\u51fa\u4fe1\u53f7\u7684\u7075\u654f\u5ea6\u901a\u5e38\u5728 <strong>-38 dBV<\/strong> \u548c SNR \u503c\u4e4b\u95f4 <strong>60-70 \u5206\u8d1d<\/strong>.\u4e3a\u4e86\u4fdd\u6301\u4fe1\u53f7\u7684\u5b8c\u6574\u6027 <strong>\u524d\u7f6e\u653e\u5927\u5668\u4e2d\u7684\u8fd0\u7b97\u653e\u5927\u5668<\/strong> \u5fc5\u987b\u5c06\u566a\u97f3\u3001\u5931\u771f\u548c\u76f8\u4f4d\u8bef\u5dee\u964d\u81f3\u6700\u4f4e\uff0c\u5c24\u5176\u662f\u5728\u8de8 <strong>20 \u5343\u8d6b\u97f3\u9891\u5e26\u5bbd<\/strong>.<\/p><h2 class=\"wp-block-heading\">1. <strong>\u7535\u538b\u566a\u58f0\uff1a\u91cd\u4e2d\u4e4b\u91cd<\/strong><\/h2><p>\u6b64\u5e94\u7528\u4e2d\u6700\u5173\u952e\u7684\u8fd0\u7b97\u653e\u5927\u5668\u89c4\u683c\u662f <strong>\u8f93\u5165\u7535\u538b\u566a\u58f0\u5bc6\u5ea6<\/strong>\u901a\u5e38\u8868\u793a\u4e3a <strong>nV\/\u221aHz<\/strong>.\u4e3a\u907f\u514d\u964d\u4f4e\u9ea6\u514b\u98ce\u7684\u4fe1\u566a\u6bd4\uff0c\u8fd0\u7b97\u653e\u5927\u5668\u81ea\u8eab\u7684\u566a\u58f0\u5e94\u4e3a <strong>\u6bd4\u8bdd\u7b52\u7684\u81ea\u566a\u5e95\u9650\u4f4e 10 \u5206\u8d1d<\/strong>.<\/p><p>\ud83d\udcca \u793a\u4f8b\uff1a<\/p><ul class=\"wp-block-list\"><li>\u9ea6\u514b\u98ce\u672c\u5e95\u566a\u58f0\uff1a-103 dBV<\/li>\n\n<li>\u6240\u9700\u7684\u8fd0\u7b97\u653e\u5927\u5668\u672c\u5e95\u566a\u58f0\uff1a \u2264 -113 dBV<\/li>\n\n<li>\u7b49\u540c\u4e8e <strong>\u2264 15.9 nV\/\u221aHz<\/strong> \u8d85\u8fc7 20 \u5343\u8d6b<\/li><\/ul><p>\ud83d\udd0e \u6a21\u62df\u5668\u4ef6\u516c\u53f8\u63d0\u4f9b <a href=\"https:\/\/www.analog.com\/en\/analog-dialogue\/articles\/op-amp-applications-in-audio.html\">\u97f3\u9891\u4f4e\u566a\u58f0\u8fd0\u7b97\u653e\u5927\u5668\u9009\u62e9\u8be6\u7ec6\u6307\u5357<\/a>\u5305\u62ec\u5b9e\u9645\u6027\u80fd\u63d0\u793a\u3002<\/p><h2 class=\"wp-block-heading\">2. <strong>\u5e26\u5bbd\u548c\u538b\u6446\u7387<\/strong><\/h2><p>\u4e3a\u4e86\u4fdd\u6301\u9ad8\u9891\u97f3\u9891\u5185\u5bb9\u7684\u7eaf\u51c0\u518d\u73b0\uff0c\u8fd0\u7b97\u653e\u5927\u5668\u7684 <strong>\u538b\u6446\u7387<\/strong> \u5fc5\u987b\u8db3\u591f\u9ad8\uff0c\u4ee5\u652f\u6301\u6700\u5feb\u7684\u7535\u538b\u8f6c\u6362\u3002\u5e38\u7528\u7684\u8bbe\u8ba1\u516c\u5f0f\u662f<\/p><pre class=\"wp-block-preformatted\">\u66f3\u5149\u7387 \u2265 2 \u00d7 \u03c0 \u00d7 fMAX \u00d7 VP<br><code><br><\/code><\/pre><p>\u4f8b\u5982\uff1a<\/p><ul class=\"wp-block-list\"><li><code>fMAX<\/code> = 20 \u5343\u8d6b<\/li>\n\n<li><code>\u526f\u4e3b\u5e2d<\/code> = \u8f93\u51fa\u5cf0\u503c\u7535\u538b\uff08\u4f8b\u5982 12 V \u2192 8.5 VRMS\uff09<\/li><\/ul><p>\u2705 \u6700\u4f4e\u56de\u8f6c\u901f\u7387\u8981\u6c42\uff1a <strong>~1.5 V\/\u03bcs<\/strong><\/p><p>\u5c3d\u7ba1\u9ad8\u9891\u5168\u91cf\u7a0b\u4fe1\u53f7\u5f88\u5c11\u89c1\uff0c\u4f46\u8fd0\u7b97\u653e\u5927\u5668\u5e94\u80fd\u5904\u7406\u8fb9\u7f18\u60c5\u51b5\uff0c\u800c\u4e0d\u4f1a\u5f15\u8d77\u56de\u8f6c\u5931\u771f\u3002<\/p><h2 class=\"wp-block-heading\">3. <strong>THD+N\uff08\u603b\u8c10\u6ce2\u5931\u771f + \u566a\u97f3\uff09<\/strong><\/h2><p>\u9ad8\u6027\u80fd\u97f3\u9891\u7cfb\u7edf\u8981\u6c42\u5c06\u8fd0\u7b97\u653e\u5927\u5668\u7684 THD+N \u964d\u5230\u6700\u4f4e\uff0c\u4ee5\u4fdd\u6301\u6e05\u6670\u5ea6\u5e76\u51cf\u5c11\u4fe1\u53f7\u4f2a\u8ff9\u3002<\/p><p>\ud83c\udfaf \u63a8\u8350\uff1a<\/p><ul class=\"wp-block-list\"><li>THD+N \u2264 <strong>0.001%<\/strong> \u6216 <strong>-100 \u5206\u8d1d<\/strong><\/li>\n\n<li>\u5c24\u5176\u91cd\u8981\u7684\u662f <strong>\u8bed\u97f3\u5904\u7406<\/strong>, <strong>\u667a\u80fd\u97f3\u9891\u8bbe\u5907<\/strong>\u4ee5\u53ca <strong>\u9ad8\u5206\u8fa8\u7387 ADC \u524d\u7aef<\/strong><\/li><\/ul><p>TI \u7684 <a href=\"https:\/\/www.ti.com\/lit\/an\/sboa092a\/sboa092a.pdf\">\u97f3\u9891\u8fd0\u7b97\u653e\u5927\u5668\u6307\u5357<\/a> \u6df1\u5165\u63a2\u8ba8\u4e86\u5728\u5404\u79cd\u97f3\u9891\u6761\u4ef6\u4e0b\u5982\u4f55\u4f18\u5316\u8fd0\u7b97\u653e\u5927\u5668\u4ee5\u5b9e\u73b0\u4f4e\u603b\u8c10\u6ce2\u5931\u771f\uff08THD+N\uff09\u3002<\/p><h2 class=\"wp-block-heading\">4. <strong>\u80fd\u6548\u548c\u5e94\u7528\u8003\u8651\u56e0\u7d20<\/strong><\/h2><p>\u5728 <strong>\u7535\u6c60\u4f9b\u7535\u7684 MEMS \u9ea6\u514b\u98ce\u5e94\u7528<\/strong> \u5982 TWS \u8033\u673a\u6216\u4fbf\u643a\u5f0f\u5f55\u97f3\u673a\u3001 <strong>\u4f4e\u529f\u8017\u8fd0\u7b97\u653e\u5927\u5668<\/strong> \u7ecf\u5e38\u9700\u8981\u3002\u8bbe\u8ba1\u4eba\u5458\u5e94\u517c\u987e\u4ee5\u4e0b\u51e0\u70b9<\/p><ul class=\"wp-block-list\"><li>\u9759\u6001\u7535\u6d41<\/li>\n\n<li>\u542f\u52a8\u65f6\u95f4<\/li>\n\n<li>\u5305\u88c5\u5c3a\u5bf8<\/li>\n\n<li>\u7535\u538b\u8f68\u517c\u5bb9\u6027\uff08\u5982 1.8V\/3.3V \u7cfb\u7edf\uff09<\/li><\/ul><p>\ud83d\udccc \u4f7f\u7528 <strong>\u4f4e\u529f\u8017\u7cbe\u5bc6\u8fd0\u7b97\u653e\u5927\u5668<\/strong> \u4fbf\u643a\u5f0f\u8bbe\u5907\uff0c\u4ee5\u53ca <strong>\u5168\u5e26\u5bbd\u8fd0\u7b97\u653e\u5927\u5668<\/strong> \u9002\u7528\u4e8e\u5de5\u4f5c\u5ba4\u6216\u5de5\u4e1a\u5e94\u7528\u3002<\/p><h2 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u4f7f\u7528 WBC2718 \u8bbe\u8ba1\u76ee\u6807<\/h2><p>\u5047\u8bbe MEMS \u9ea6\u514b\u98ce\u7684\u53c2\u6570\u5982\u4e0b\uff1a<\/p><ul class=\"wp-block-list\"><li>\u4fe1\u566a\u6bd4\uff1a 65 dB<\/li>\n\n<li>\u7075\u654f\u5ea6\uff1a -38 dBV<\/li>\n\n<li>\u5e26\u5bbd\uff1a20 \u5343\u8d6b<\/li>\n\n<li>\u672c\u5e95\u566a\u58f0\uff1a-103 dBV<\/li><\/ul><p>\u786e\u4fdd\u524d\u7f6e\u653e\u5927\u5668\u7684\u566a\u97f3\u6700\u5c0f\uff1a<\/p><ul class=\"wp-block-list\"><li>\u8fd0\u7b97\u653e\u5927\u5668\u76ee\u6807\u566a\u58f0\uff1a \u2264 <strong>-113 dBV<\/strong> \u6216 <strong>\u2264 15.9 nV\/\u221aHz<\/strong><\/li>\n\n<li>\u8dc3\u53d8\u901f\u7387\uff1a \u2265 <strong>1.5 V\/\u03bcs<\/strong><\/li>\n\n<li>THD+N: \u2264 <strong>-100 \u5206\u8d1d<\/strong><\/li><\/ul><p>\ud83c\udfaf <strong>WBC2718<\/strong>\u7ed3\u5408 SISTC MEMS \u9ea6\u514b\u98ce\uff0c\u5982 <a class=\"\" href=\"https:\/\/sistc.com\/zh\/product-category\/mems-microphone\/\">WBC6556<\/a>\u5b83\u6ee1\u8db3\u8fd9\u4e9b\u6761\u4ef6\uff0c\u662f\u9ad8\u4fdd\u771f\u3001\u4f4e\u566a\u58f0\u5e94\u7528\u7684\u7406\u60f3\u9009\u62e9\u3002<\/p><h2 class=\"wp-block-heading\">\u7ed3\u8bba<\/h2><p>\u9009\u62e9\u5408\u9002\u7684\u8fd0\u7b97\u653e\u5927\u5668 <strong>\u5bf9\u4e8e\u91ca\u653e MEMS \u9ea6\u514b\u98ce\u7684\u6027\u80fd\u81f3\u5173\u91cd\u8981<\/strong>.\u4ece\u8f93\u5165\u7535\u538b\u566a\u58f0\u5230 THD+N \u548c\u529f\u7387\u6548\u7387\uff0c\u6bcf\u4e00\u4e2a\u53c2\u6570\u90fd\u5fc5\u987b\u7b26\u5408\u60a8\u7684\u5e94\u7528\u76ee\u6807--\u65e0\u8bba\u60a8\u662f\u5728\u5236\u9020\u667a\u80fd\u52a9\u7406\u3001\u4f1a\u8bae\u7cfb\u7edf\u8fd8\u662f\u5de5\u4e1a\u58f0\u5b66\u663e\u793a\u5668\u3002<\/p><p>\ud83d\udee0\ufe0f \u8bbf\u95ee\u6211\u4eec\u7684 MEMS \u9ea6\u514b\u98ce\u4ea7\u54c1\u7ec4\u5408\uff1a<br>\ud83d\udc49 <a class=\"\" href=\"https:\/\/sistc.com\/zh\/product-category\/mems-microphone\/\">https:\/\/sistc.com\/product-category\/mems-microphone\/<\/a><\/p><p>\ud83d\udd17 \u9605\u8bfb\u6a21\u62df\u5668\u4ef6\u516c\u53f8\u7684\u66f4\u591a\u4fe1\u606f\uff1a<br><a href=\"https:\/\/www.analog.com\/en\/technical-articles\/designing-low-noise-audio-op-amp-circuits.html\">\u7528\u4e8e\u7cbe\u5bc6\u97f3\u9891\u7684\u8fd0\u7b97\u653e\u5927\u5668<\/a><br>\ud83d\udd17 \u6765\u81ea TI \u7684\u5e94\u7528\u63d0\u793a\uff1a<br><a href=\"https:\/\/www.ti.com\/audio-ic\/amplifiers\/audio-op-amps\/overview.html\">TI \u4f4e\u5931\u771f\u97f3\u9891\u8fd0\u7b97\u653e\u5927\u5668<\/a><\/p><p>\ud83d\udcde \u5728\u9009\u62e9\u5408\u9002\u7684\u524d\u7f6e\u653e\u5927\u5668\u6216 MEMS \u9ea6\u514b\u98ce\u7ec4\u5408\u65f6\u9700\u8981\u5e2e\u52a9\uff1f <a href=\"https:\/\/sistc.com\/zh\/contact\/\">\u8054\u7cfb\u6211\u4eec<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u5728\u97f3\u9891\u7cfb\u7edf\u8bbe\u8ba1\u4e2d\uff0c\u9ad8\u8d28\u91cf\u7684\u524d\u7f6e\u653e\u5927\u5668\u7535\u8def\u81f3\u5173\u91cd\u8981\uff0c\u53ef\u786e\u4fdd MEMS \u9ea6\u514b\u98ce\u7684\u4fe1\u53f7\u5728\u53d1\u9001\u5230 ADC \u6216\u4e0b\u6e38 [...] \u4e4b\u524d\u5f97\u5230\u9002\u5f53\u8c03\u8282\u3002<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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