二阶RC无源低通滤波器仿真.doc

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1、二阶RC无源低通滤波器仿真一、Multism仿真（1）仿真电路图（2）仿真结果二、MATLAB仿真及实验数据（1）实验数据A、无源频率（kHz）11.31.41.61.71.81.92.12.22.32.42.6电压（V）0.780.770.760.750.740.730.720.710.700.690.680.67频率（kHz）2.72.82.93.03.13.33.43.53.63.83.94.0电压（V）0.660.650.640.630.620.610.600.590.580.570.560.55B、有源频率（kHz）1.01.21.41.51.61

2、.7电压（V）0.990.980.970.960.950.94频率（kHz）1.81.92.02.12.22.3电压（V）0.930.920.910.890.870.86频率（kHz）2.42.52.62.72.82.9电压（V）0.840.820.800.780.750.73频率（kHz）3.03.13.23.33.43.5电压（V）0.710.690.660.640.620.60频率（kHz）3.63.73.83.94.04.1电压（V）0.580.560.540.520.500.48频率（kHz）4.24.34.44.54.6电压（V）0.460.45

3、0.430.420.40（1）仿真图形三、附件：（MATLAB仿真程序）w=0:0.01:100000;b=[1];a=[0.0000000004,0.00006,1];H=freqs(b,a,w);figureplot(w,abs(H),'-r');grid;xlabel('omega');ylabel('

4、H(jomega

5、');title('幅频特性')holdonH=[0.780.770.760.750.740.730.720.710.700.690.680.670.660.650.640.630.620.610.600.590.580.570.

6、560.55];f=[100013001400160017001800190021002200230024002600270028002900300031003300340035003600380039004000];w=2*pi*f;plot(w,abs(H),'-g');holdonH=[0.990.980.970.960.950.940.930.920.910.890.870.860.840.820.800.780.750.730.710.690.660.640.620.600.580.560.540.520.500.480.460.450.430.4

7、20.40];f=[10001200140015001600170018001900200021002200230024002500260027002800290030003100320033003400350036003700380039004000410042004300440045004600];w=2*pi*f;plot(w,abs(H),'-b');legend('仿真','无源','有源');title('相频特性')