Design a filter of order n with notch response and Butterworth approximation, which has a central frequency of f0=60Hz, and cut-off frequencies of the rejection band located at fL=30Hz, fH=90Hz, taking into account that:

The attenuation at 60Hz is -20db. Run a simulation with LTSpice to check your results.

Build a filter with the same characteristics as in part a), but using only 1st order filters, with unity gain, and compare the performance of both filters. Run a simulation with LTSpice to check your results.

The attenuation at 60Hz is -40dB.

How can you solve the problem in part d)? Run a simulation with LTSpice to check your results.