Datenblatt-Suchmaschine für elektronische Bauteile |
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LS204IN Datenblatt(PDF) 10 Page - STMicroelectronics |
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LS204IN Datenblatt(HTML) 10 Page - STMicroelectronics |
10 / 16 page Application information for active low-pass filters LS204 10/16 4.5 Example Figure 14. 5th order low-pass filter (Butterworth) with unity gain configuration In the circuit of Figure 14, for Fc = 3.4 kHz and Ri = R1 = R2 = R3 = 10 kW, we obtain: The attenuation of the filter is 30 dB at 6.8 kHz and better than 60 dB at 15 kHz. The same method, referring to Table 7 and Figure 15 is used to design high-pass filters. In this case the damping factor is found by taking the reciprocal of the numbers in Table 7. For Fc = 5 kHz and Ci = C1 = C2 = C3 = 1 nF we obtain: Figure 15. 5th order high-pass filter (Butterworth) with unity gain configuration C2 R2 R1 C1 Ri Ci C4 R4 R3 C3 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 R2 C2 C1 R1 Ri Ci R4 C3 R3 C4 |
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