I'm to design a 2nd order, N=2, butterworth HPF starting from the normalized transfer function for a LPF:
HN(s)=1/(s^2+1.414*s+1)
Given:
T=0.004
Ωc=0.8 pi
wc=192 pi
To find the transfer function of the HPF, substitute s for wc/s:
H(s)=HN(wc/s)=s^2/(s^2+853*s+363833)
Here's my...