1、.二階 RC 無源低通濾波器仿真一、Multism 仿真（ 1）仿真電路圖（ 2）仿真結(jié)果二、MATLAB仿真及實驗數(shù)據(jù)（ 1）實驗數(shù)據(jù)A、 無源頻率（ kHz）11.31.41.61.71.81.92.12.22.32.42.6電壓（ V）0.780.770.760.750.740.730.720.710.700.690.680.67頻率（ kHz）2.72.82.93.03.13.33.43.53.63.83.94.0電壓（ V）0.660.650.640.630.620.610.600.590.580.570.560.55B、 有源頻率（ kHz）1.01.21.41.51.61.7電壓

2、（ V）0.990.980.970.960.950.94頻率（ kHz）1.81.92.02.12.22.3電壓（ V）0.930.920.910.890.870.86頻率（ kHz）2.42.52.62.72.82.9.電壓（ V）0.840.820.800.780.750.73頻率（ kHz）3.03.13.23.33.43.5電壓（ V）0.710.690.660.640.620.60頻率（ kHz）3.63.73.83.94.04.1電壓（ V）0.580.560.540.520.500.48頻率（ kHz）4.24.34.44.54.6電壓（ V）0.460.450.430.420.

3、40（ 2）仿真圖形.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(|H(jomega|);title( 幅頻特性 )hold onH=0.78 0.77 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 0.68 0.67 0.66 0.65 0.64 0.63 0.62 0.61 0.60 0.59 0.58 0.57 0.56 0.55;f=

4、1000 1300 1400 1600 1700 1800 1900 2100 2200 2300 2400 2600 2700 2800 2900 3000 3100 3300 3400 3500 3600 3800 3900 4000;w=2*pi*f;plot(w,abs(H),-g);hold onH=0.99 0.98 0.97 0.96 0.95 0.94 0.93 0.92 0.91 0.89 0.87 0.86 0.84 0.82 0.80 0.78 0.75 0.73 0.71 0.69 0.66 0.64 0.62 0.60 0.58 0.56 0.54 0.52 0.50 0.48 0.46 0.45 0.43 0.42 0.40;f=1000 1200 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400