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1、二阶低通幅频特性当=20^Rl=R2=7?=33K,Cl=C2=104pF理论值：fc=2兀RC12^>33x103»104x10_,2=482.5Hz带通电压增益*土等"输入信号：科離值谢：0.71matalb禾呈丿芋:f=[2080150220300350400420450480500550600700900];u=[1.1481.1551.1621.1551.1191.0711.0050.9730.930.8690.8330.7440.6590.5140.327];a=polyfit(u,f,3)；plot(f,u,E)；title(低频幅频特性曲线f=500Hz
2、,);xlabel(T);ylabel('uo');当型=2OK,R1=R2=/?=33K,C1=C2=1O》F理论值:=4.83册112ttRC~2^*33xlO3elO3xlOZ12带通电压增益：人“+卜山输入信号：右濮值恥0.71matlab程序:f=[1005001000200030003500400042004400460048005000600080001000020000];u=[1.1531.1451.132Lil1.0551.010.940.920.880.830.820.780.630.40.30」];fl二log10(f);a=polyfit(u,
3、fl,3)；plot(fl,u,x)；title(低频幅频特性曲线f=5kHzf);xlabel(,loglO(0，);ylabelCuo*);二阶高通幅频特性当=20/C,Rl=R2=7?=33K,Cl=C2=104pF理论值:fc=]2兀RC12^e33xl03*104xl0-'2=482.5HzR带通电压增益：宀1+右1.61输入信号：阵轴为：0.34matlab程序:f=[5015025035040044046048055060065070080090010001200150020003000];u=[0.0080.060.1540.2740.3320.3740
4、.3920.4130.4540.4780.4950.510.530.5350.540.5460.5480.5480.548];a=polyfit(u,f,3)；plot(f,u〉*)；title。高频幅频特性曲线f=500Hz,);xlabel(T);ylabelCuo1);当型=2OK,R1=R2=/?=33K,C1=C2=1O》F理论值：z=4.83册112/rRC~2^*33xlO3elO3xlOZ12带通电压增益：人“+卜山输入信号：右濮值恥0.71matlab程序:f=[100500100020003000400045004800500055006000650
5、0700075008000850010000150002000040000];u=[0.0010.0060.0250.0970.2050.3180.360.380.3950.430.450.470.4830.4930.5010.5070.5160.5170.5210.522];fl=log10(f);a=polyfit(u,fl,3)；plot(fl,u,'-*‘);titleC高频幅频特性曲线f=5kHz*);xlabelCloglOCf)1)；ylabel(,uo,);带通滤波电路幅频特性曲线输入信号：祚濮值两：1.37matlab程序：f二[50150250350
6、400450480500550600650750900120020003000350040004500480050005500600080001200020000];u=[0.0010.030.080.220.420.560.860.9761.121.271.321.3541.3581.3561.3541.3321.271.211」21.020.930.690.320」90.090.001];fl=log10(f);a=polyfit(u,fl,3)；plot(fl,u,L*)；title(带通滤波幅频特性曲线500Hz-5kHz!);xlabelClog10(f)1)
7、;ylabel(,uo,);Iog10(f)带阻滤波幅频特性matlab程序:f=[100200300400450500600700800100020003000350040004500500060008000100001500025000]；u=[2.2992.32.221.9991.8271.6521.3161.040.8350.5820.4610.8141.031.2361.421.5761.791.9992.0672.1042.108];fl=logl0(f);a=polyfit(u,fl,3)；plot(fl,u；-*');ti
