{"id":1078,"date":"2026-03-18T09:41:23","date_gmt":"2026-03-18T01:41:23","guid":{"rendered":"https:\/\/www.640629.xyz\/?p=1078"},"modified":"2026-03-18T11:54:09","modified_gmt":"2026-03-18T03:54:09","slug":"op-amp%e6%96%b9%e6%b3%a2%e7%94%a2%e7%94%9f%e5%99%a8%e3%80%81%e5%8c%97%e7%a7%91%e5%a4%a7%e3%80%81%e9%ab%98%e9%9b%84%e7%a7%91%e5%a4%a7%e6%8e%a8%e7%94%84%e5%af%a6%e4%bd%9c%e8%a9%a6%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/www.640629.xyz\/?p=1078","title":{"rendered":"OP Amp\u65b9\u6ce2\u7522\u751f\u5668\u3001\u5317\u79d1\u5927\u3001\u9ad8\u96c4\u79d1\u5927\u63a8\u7504\u5be6\u4f5c\u8a66\u984c"},"content":{"rendered":"
\n
\"\"<\/figure>\n<\/div>\n\n
\n
\"\"<\/figure>\n<\/div>\n\n
\n
\"\"\/<\/figure>\n<\/div>\n\n\n

\u3010\u4f5c\u696d\u7df4\u7fd2\u3011106\u3001111\u3001112\u81fa\u5317\u79d1\u5927\u96fb\u6a5f\u5be6\u4f5c\u8a66\u984c\uff0cVCC<\/sub>=15 V\uff08\u6ce8\u610f\uff1a\u6b64OP Amp\u63a1\u7528\u55ae\u96fb\u6e90\uff09\uff0cR1<\/sub>=10 k\u03a9\uff0cVR1<\/sub>=50 k\u03a9\uff0cVR2<\/sub>=100 k\u03a9\uff0cC=10 \u03bcF\uff0cR2<\/sub>=10 k\u03a9\uff0cR3<\/sub>=1 k\u03a9\u3002<\/p>\n\n\n\n

<\u89e3\u6790><\/p>\n\n\n\n

1\u3001\u9707\u76ea\u9031\u671f\u8207\u983b\u7387\u7bc4\u570d\uff1a<\/p>\n\n\n\n

\u3000\u3000 T = t1<\/sub> + t2<\/sub> = 2 * R * C * ln [ (1+\u03b2) \/ (1-\u03b2) ]\uff0c\u5176\u4e2d R = R1<\/sub> + VR2<\/sub> \uff0c \u03b2 \u662f\u6b63\u56de\u6388\u7684\u5206\u58d3\u6bd4\u4f8b\u3002<\/p>\n\n\n\n

\u3000\u3000\u5047\u8a2dVR1<\/sub>\u8abf\u5728\u4e2d\u9ede\u4f4d\u7f6e\u6642\uff0c\u5176\u6234\u7dad\u5be7\u7b49\u6548\u96fb\u963b\u70ba Rth<\/sub> = 25 k\u03a9 \/\/ 25 k\u03a9 = 12.5 k\u03a9<\/p>\n\n\n\n

\u3000\u3000\u03b2 = Rth<\/sub> \/ (R2<\/sub> + Rth<\/sub>) = 12.5k\u03a9 \/ (10k\u03a9 + 12.5k\u03a9) \u2252 0.556<\/p>\n\n\n\n

\u3000\u3000\u5c0d\u6578\u9805 ln [ (1+\u03b2) \/ (1-\u03b2) ] = ln ( 1.556 \/ 0.444) = ln (3.5)<\/p>\n\n\n\n

\u3000\u3000T = 2 * R * C * ln (3.5)<\/p>\n\n\n\n

\u3000\u3000\u6700\u9ad8\u983b\u7387 (\u7576 VR2<\/sub> = 0 \u03a9\uff0cR = R1<\/sub> + VR2<\/sub> = 10 k\u03a9)<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000T = 2 * 10k * 10u * ln (3.5) \u2252 0.25 \u79d2<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000fmax<\/sub>\u00a0\u2252 4 Hz<\/p>\n\n\n\n

\u3000\u3000\u6700\u4f4e\u983b\u7387 (\u7576 VR2<\/sub> = 100 k\u03a9\uff0cR = R1<\/sub> + VR2<\/sub> = 110 k\u03a9)<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000T = 2 * 110k * 10u * ln (3.5) \u2252 2.76 \u79d2<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000fmin<\/sub>\u00a0\u2252 0.36 Hz<\/p>\n\n\n\n

2\u3001\u8f49\u6298\u96fb\u58d3\uff1a<\/p>\n\n\n\n

\u3000\u3000\u7576VR1<\/sub>\u8abf\u5728\u4e2d\u9ede\u4f4d\u7f6e\u6642\uff0cV+<\/sub> = VCC<\/sub> \/ 2 = 7.5 V\uff0c\u82e5\u4e0d\u8003\u616e\u975e\u7406\u60f3\u60c5\u6cc1\uff0c\u5047\u8a2dVo(sat)<\/sub>\u00a0= VCC<\/sub> = 15V\uff0c<\/p>\n\n\n\n

\u3000\u3000\u57fa\u6e96\u9ede\u96fb\u58d3\u70ba 15 \/ 2 = 7.5 V<\/p>\n\n\n\n

\u3000\u3000\u4e0a\u8f49\u6298\u96fb\u58d3 Vu<\/sub> = 7.5 + \u03b2 (15 – 7.5) = 7.5 + 0.556 * 7.5 \u2252 11.67 V<\/p>\n\n\n\n

\u3000\u3000\u4e0b\u8f49\u6298\u96fb\u58d3 Vl<\/sub> = 7.5 – \u03b2 (7.5 – 0) = 7.5 – 0.556 * 7.5 \u2252 3.33 V<\/p>\n\n\n

\n
\"\"\/<\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"

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