Hi, everybody,
I have deduced several times for the transfer function of 3rd order Butterworth low pass filter, but the transfer function I got is
vo(s)/vi(s) = 1/( 2S^3 + 4S^2 + 4S + 2 )
while the transfer function of this filter in textbook and many document is
vo(s)/vi(s) = 1/( S^3 + 2S^2 + 2S + 1 )
I don't know what the problem is in my deduction, can anyone help me?
I have deduced several times for the transfer function of 3rd order Butterworth low pass filter, but the transfer function I got is
vo(s)/vi(s) = 1/( 2S^3 + 4S^2 + 4S + 2 )
while the transfer function of this filter in textbook and many document is
vo(s)/vi(s) = 1/( S^3 + 2S^2 + 2S + 1 )
I don't know what the problem is in my deduction, can anyone help me?