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LS404I 데이터시트(PDF) 8 Page - STMicroelectronics |
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LS404I 데이터시트(HTML) 8 Page - STMicroelectronics |
8 / 11 page LS404 8/11 In the circuit of figure 14, for fc = 3.4kHz and R i = R1 = R2 = R3 = 10k Ω, we obtain: The attenuation of the filter is 30dB at 6.8kHz and better than 60dB at 15kHz. The same method, referring to table 2 and figure 15 is used to design high-pass filter. In this case the damping factor is found by taking the recipro- cal of the numbers in table 2. For fc = 5kHz and Ci = C1 = C2 = C3 = 1nF we obtain: Table 2 : Damping Factor for Low-pass Butterworth Filters Figure 15 : 5th Order High-pass Filter (Butterworth) with Unity Gain configuration Ci = 1.354 1 R ---- 1 2 πfc ------------ = 6.33nF C1 = 0.421 1 R ---- 1 2 πfc ------------ = 1.97nF C2 = 1.753 1 R ---- 1 2 πfc ------------ = 8.20nF C3 = 0.309 1 R ---- 1 2 πfc ------------ = 1.45nF C4 = 3.325 1 R ---- 1 2 πfc ------------ = 15.14nF Ri = 1 0.354 --------------- 1 C ---- 1 2 πfc ------------ = 25.5k Ω R1 = 1 0.421 --------------- 1 C ---- 1 2 πfc ------------ = 75.6k Ω R2 = 1 1.753 --------------- 1 C ---- 1 2 πfc ------------ = 18.2k Ω R3 = 1 0.309 --------------- 1 C ---- 1 2 πfc ------------ = 103k Ω R4 = 1 3.325 --------------- 1 C ---- 1 2 πfc ------------ = 9.6k Ω Order Ci C1 C2 C3 C4 C5 C6 C7 C8 2 0.707 1.41 3 1.392 0.202 3.54 4 0.92 1.08 0.38 2.61 5 1.354 0.421 1.75 0.309 3.235 6 0.966 1.035 0.707 1.414 0.259 3.86 7 1.336 0.488 1.53 0.623 1.604 0.222 4.49 8 0.98 1.02 0.83 1.20 0.556 1.80 0.195 5.125 R2 C2 C1 R1 Ri Ci R4 C3 R3 C4 |
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