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1. |
What is the stop band frequency of the normalized low pass Butterworth filter used to design a analog band pass filter with -3.0103dB upper and lower cutoff frequency of 50Hz and 20KHz and a stop band attenuation 20dB at 20Hz and 45KHz? |
A. | 2 rad/sec |
B. | 2.25 Hz |
C. | 2.25 rad/sec |
D. | 2 Hz |
Answer» D. 2 Hz | |