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NF<\/strong>)\u76f4\u63a5\u5f71\u54cd\u6574\u4e2a\u63a5\u6536\u7cfb\u7edf\u7684\u6027\u80fd\u3002\u56e0\u6b64\uff0cLNA\u7684\u8bbe\u8ba1\u5fc5\u987b\u5728\u653e\u5927\u589e\u76ca\u4e0e\u566a\u58f0\u63a7\u5236\u4e4b\u95f4\u53d6\u5f97\u6700\u4f73\u5e73\u8861\uff0c\u4ee5\u786e\u4fdd\u63a5\u6536\u5668\u80fd\u591f\u5728\u4f4e\u4fe1\u566a\u6bd4(SNR<\/strong>)\u73af\u5883\u4e0b\u4ecd\u4fdd\u6301\u9ad8\u6548\u7684\u4fe1\u53f7\u5904\u7406\u80fd\u529b\u3002<\/p>\n\n\n\n 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Figure<\/strong>)\u3001\u7ebf\u6027\u5ea6(Linearity<\/strong>)\u4ee5\u53ca\u9694\u79bb\u5ea6(Isolation<\/strong>)\u3002\u4f4e\u566a\u58f0\u7684\u6df7\u9891\u5668\u8bbe\u8ba1\u80fd\u591f\u6700\u5c0f\u5316\u7cfb\u7edf\u7684\u603b\u566a\u58f0\uff0c\u63d0\u9ad8\u4fe1\u53f7\u7684\u4fe1\u566a\u6bd4(SNR<\/strong>)\uff0c\u4ece\u800c\u589e\u5f3a\u63a5\u6536\u5668\u5bf9\u5fae\u5f31\u4fe1\u53f7\u7684\u68c0\u6d4b\u80fd\u529b\u3002\u540c\u65f6\uff0c\u9ad8\u7ebf\u6027\u5ea6\u7684\u6df7\u9891\u5668\u80fd\u591f\u6709\u6548\u6291\u5236\u4e92\u8c03\u5e72\u6270\u548c\u975e\u7ebf\u6027\u5931\u771f\uff0c\u786e\u4fdd\u4fe1\u53f7\u7684\u5b8c\u6574\u6027\u548c\u51c6\u786e\u6027\u3002<\/p>\n\n\n\n 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\u3000\u3000\u5728\u65e0\u7ebf\u901a\u4fe1\u7cfb\u7edf\u4e2d\uff0c\u4e0d\u540c\u8c03\u5236\u65b9\u5f0f\u7684\u89e3\u8c03\u6280\u672f\u5404\u5177\u7279\u8272\uff0c\u9488\u5bf9\u4e0d\u540c\u7684\u8c03\u5236\u4fe1\u53f7\u91c7\u7528\u76f8\u5e94\u7684\u89e3\u8c03\u65b9\u6cd5\u80fd\u591f\u6709\u6548\u6062\u590d\u539f\u59cb\u4fe1\u606f\u3002\u5176\u4e2d\uff0c**\u8c03\u5e45(AM)\u548c<\/strong>\u8c03\u9891(FM)**\u4f5c\u4e3a\u6700\u5e38\u89c1\u7684\u4e24\u79cd\u6a21\u62df\u8c03\u5236\u65b9\u5f0f\uff0c\u5176\u89e3\u8c03\u6280\u672f\u5728\u539f\u7406\u548c\u5b9e\u73b0\u4e0a\u5b58\u5728\u663e\u8457\u5dee\u5f02\u3002\u7406\u89e3\u8fd9\u4e9b\u5dee\u5f02\u5bf9\u4e8e\u8bbe\u8ba1\u9ad8\u6548\u53ef\u9760\u7684\u63a5\u6536\u7cfb\u7edf\u81f3\u5173\u91cd\u8981\u3002<\/p>\n\n\n\n \u3000\u3000\u8c03\u5e45\uff08AM\uff09\u4fe1\u53f7\u7684\u89e3\u8c03\u4e3b\u8981\u4f9d\u8d56\u4e8e\u5305\u7edc\u68c0\u6ce2\u5668<\/strong>(Envelope Detector)\u539f\u7406\u3002AM\u4fe1\u53f7\u901a\u8fc7\u6539\u53d8\u8f7d\u6ce2\u7684\u5e45\u5ea6\u6765\u643a\u5e26\u4fe1\u606f\uff0c\u56e0\u6b64\u5176\u5305\u7edc\u5305\u542b\u4e86\u539f\u59cb\u7684\u8c03\u5236\u4fe1\u606f\u3002\u5305\u7edc\u68c0\u6ce2\u5668\u901a\u5e38\u7531\u4e00\u4e2a\u4e8c\u6781\u7ba1\u6574\u6d41\u5668\u548c\u4e00\u4e2a\u4f4e\u901a\u6ee4\u6ce2\u5668\u7ec4\u6210\uff0c\u4e8c\u6781\u7ba1\u7528\u4e8e\u5c06AM\u4fe1\u53f7\u7684\u6b63\u534a\u5468\u671f\u9009\u901a\uff0c\u5f62\u6210\u8109\u52a8\u7684\u76f4\u6d41\u7535\u538b\uff0c\u800c\u4f4e\u901a\u6ee4\u6ce2\u5668\u5219\u7528\u4e8e\u5e73\u6ed1\u8fd9\u4e9b\u8109\u52a8\uff0c\u63d0\u53d6\u51fa\u539f\u59cb\u7684\u57fa\u5e26\u4fe1\u53f7\u3002\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u4e14\u6210\u672c\u4f4e\u5ec9\uff0c\u9002\u7528\u4e8e\u5e45\u5ea6\u8c03\u5236\u4fe1\u53f7\u7684\u5b9e\u65f6\u89e3\u8c03\u3002\u7136\u800c\uff0c\u5305\u7edc\u68c0\u6ce2\u5668\u5bf9\u8f7d\u6ce2\u7684\u5b58\u5728\u4f9d\u8d56\u8f83\u5f3a\uff0c\u5f53\u8f7d\u6ce2\u4fe1\u53f7\u8870\u51cf\u6216\u5931\u771f\u65f6\uff0c\u89e3\u8c03\u6548\u679c\u4f1a\u663e\u8457\u4e0b\u964d\u3002<\/p>\n\n\n\n \u3000\u3000\u76f8\u8f83\u4e4b\u4e0b\uff0c\u8c03\u9891\uff08FM\uff09\u4fe1\u53f7\u7684\u89e3\u8c03\u5219\u9700\u8981\u66f4\u4e3a\u590d\u6742\u7684\u6280\u672f\uff0c\u4e3b\u8981\u5305\u62ec\u9891\u7387\u9274\u9891\u5668<\/strong>(Frequency Discriminator)\u548c\u9501\u76f8\u73af\uff08PLL\uff09<\/strong>(Phase-Locked Loop)\u7b49\u65b9\u6cd5\u3002FM\u4fe1\u53f7\u901a\u8fc7\u6539\u53d8\u8f7d\u6ce2\u7684\u9891\u7387\u6765\u4f20\u9012\u4fe1\u606f\uff0c\u56e0\u6b64\u89e3\u8c03\u8fc7\u7a0b\u9700\u8981\u7cbe\u786e\u68c0\u6d4b\u8f7d\u6ce2\u9891\u7387\u7684\u53d8\u5316\u3002\u9891\u7387\u9274\u9891\u5668\u5229\u7528\u975e\u7ebf\u6027\u5143\u4ef6\u5c06\u9891\u7387\u504f\u79fb\u8f6c\u6362\u4e3a\u5e45\u5ea6\u53d8\u5316\uff0c\u4ece\u800c\u5b9e\u73b0\u4fe1\u53f7\u7684\u6062\u590d\u3002\u9501\u76f8\u73af\u5219\u901a\u8fc7\u5c06\u63a5\u6536\u5230\u7684FM\u4fe1\u53f7\u4e0e\u4e00\u4e2a\u672c\u5730\u632f\u8361\u5668\u4fe1\u53f7\u8fdb\u884c\u76f8\u4f4d\u6bd4\u8f83\uff0c\u5e76\u901a\u8fc7\u53cd\u9988\u673a\u5236\u9501\u5b9a\u76f8\u4f4d\uff0c\u4ece\u800c\u63d0\u53d6\u51fa\u9891\u7387\u8c03\u5236\u7684\u57fa\u5e26\u4fe1\u53f7\u3002PLL\u65b9\u6cd5\u5177\u6709\u8f83\u9ad8\u7684\u6297\u5e72\u6270\u80fd\u529b\u548c\u9891\u7387\u7a33\u5b9a\u6027\uff0c\u9002\u7528\u4e8e\u9ad8\u8d28\u91cfFM\u4fe1\u53f7\u7684\u89e3\u8c03\u3002<\/p>\n\n\n\n \u3000\u3000\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cAM\u548cFM\u89e3\u8c03\u6280\u672f\u5404\u6709\u4f18\u52a3\uff0c\u9009\u62e9\u5408\u9002\u7684\u89e3\u8c03\u65b9\u6cd5\u9700\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u9700\u6c42\u548c\u4fe1\u53f7\u7279\u6027\u6765\u51b3\u5b9a\u3002AM\u89e3\u8c03\u5668\u7ed3\u6784\u7b80\u5355\uff0c\u9002\u7528\u4e8e\u5e7f\u64ad\u7b49\u5bf9\u6210\u672c\u654f\u611f\u7684\u5e94\u7528\uff0c\u4f46\u5176\u6297\u566a\u58f0\u6027\u80fd\u8f83\u5f31\uff0c\u5bb9\u6613\u53d7\u5230\u5e45\u5ea6\u6ce2\u52a8\u7684\u5f71\u54cd\u3002FM\u89e3\u8c03\u5668\u5219\u5728\u6297\u5e72\u6270\u80fd\u529b\u548c\u4fe1\u53f7\u8d28\u91cf\u65b9\u9762\u8868\u73b0\u4f18\u5f02\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u9ad8\u4fdd\u771f\u97f3\u9891\u4f20\u8f93\u548c\u65e0\u7ebf\u901a\u4fe1\u7cfb\u7edf\u4e2d\u3002\u7136\u800c\uff0cFM\u89e3\u8c03\u5668\u8bbe\u8ba1\u590d\u6742\u5ea6\u8f83\u9ad8\uff0c\u5bf9\u672c\u5730\u632f\u8361\u5668\u7684\u7a33\u5b9a\u6027\u8981\u6c42\u4e25\u683c\uff0c\u589e\u52a0\u4e86\u7cfb\u7edf\u7684\u8bbe\u8ba1\u96be\u5ea6\u548c\u6210\u672c\u3002<\/p>\n\n\n\n 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