Design of Analog Butterworth Filter - Design steps with an example - Problem Solved

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Design of Analog Butterworth Lowpass Filter:

  • Find the order of the filter 'N'
  • Round off the order 'N' to the next higher integer
  • Obtain the transfer function of an analog Butterworth Filter H(s) for the value of N and assume the cut off frequency is 1 rad/sec
  • Calculate the cut-off frequency
  • Find the transfer function of the Analog Butterworth Lowpass Filter Ha(s) for the calculated cut-off frequency
Problem Solved:
            Design an analog Butterworth filter that has -2dB passband attenuation at a frequency of 20 radian/sec and at least -10dB stopband attenuation at 30 radian/sec.













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