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12.Modify the filter in Figure to increase the roll-off rate to -120dB/decade. C3 0.22 μF 0.22 HF R6 4.7 kΩ 6.8 kS2 C2 0.1 μF 4.7 kΩ 6.8 1.0 k2 R7 6.8 k2 0.1 μF 6.8 k2 5.6 kΩ

Is the four-pole filter in Figure 15–45 approximately optimized for a Butterworth response? What is the roll-off rate?
Determine the critical frequency in Figure 15–45.
Without changing the response curve, adjust the component values in the filter of Figure 15–45 to make it an equal-value filter. Select C = 0.22 μF for both stages.

Answer 1

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