How to Plot FFT for the iztrans function?

I have received the inverse z transfer function for a filter. I need to plot the FFT for that. I tried a lot but it doesn`t work. Could you please support with me to plot the FFT? I am new to this area.

[Diwakar Diwakar]

please provide inverse Z-transform of the transfer function.

[Gayani]

It is the inverse of Thiran filter

Answer 1

[Diwakar Diwakar]

Try this code. may be this code will help you.

% Define the transfer function coefficients
b = [1, -1];    % Numerator coefficients
a = [1, 0.5];   % Denominator coefficients

% Generate the frequency response using freqz
N = 1024;   % Number of points for the frequency response
[H, f] = freqz(b, a, N);

% Plot the magnitude spectrum
figure;
plot(f, abs(H));
xlabel('Frequency');
ylabel('Magnitude');
title('Magnitude Spectrum');

% Plot the phase spectrum
figure;
plot(f, angle(H));
xlabel('Frequency');
ylabel('Phase');
title('Phase Spectrum');

[Gayani]

It really helps. Thank you so much