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Third Order Low pass filter question problem

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Mohammed Magdy Sharara
Mohammed Magdy Sharara on 22 Jun 2019
Closed: John D'Errico on 23 Jun 2019
Screen Shot 2019-06-23 at 2.08.50 AM.png
Hello Guys i am having a real problem with the third order Low pass filter, i have done the first order LPF but i can't start using the third order lpf I wonder if you can help me out on how to start out i want to get these:
For all the filters in this assignment use the Matlab to generate the following plots:
1. Pole-zero plot and the unit circle in the Z ́domain.
2. Magnitude response of the filter in dB in the frequency range p ́π ă ω ď πq.
3. Magnitude response of the filter in dB in the frequency range p ́ωp ď ω ď ωpq. Use this plot to get
an approximate value of the passband ripples.
4. Phase response of the filter in the frequency range p ́π ă ω ď πq.
5. Group delay of the filter in the frequency range p ́π ă ω ď πq.
6. The filter’s impulse response.
if some one can help me out with the first step i can move on to the second

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