Question: 123 A certain low-pass filter has the Bode diagram shown in Figure P123. (a) How many dB down is the filter at 100 rad=s? (b)

12–3 A certain low-pass filter has the Bode diagram shown in Figure P12–3.

(a) How many dB down is the filter at 100 rad=s?

(b) Estimate where the cutoff frequency occurs, then determine how many dB down is the filter at one octave after the cutoff frequency?

10 0.1 0.01 1 IT(jw)l 10 co (rad/s) 10 100 1000 5000

10 0.1 0.01 1 IT(jw)l 10 co (rad/s) 10 100 1000 5000 10,000 FIGURE P12-3

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