MATLAB CODE TO DESIGN A ELLIPTICAL LOW PASS FILTER

CODE:

clc;

clear all;

N = input('Order = ');

Fp = input('Passband edge frequency in Hz = ');

Rp = input('Passband ripple in dB = ');

Rs = input('Minimum stopband attenuation in dB = ');

% Determine the coefficients of the transfer function

[num,den] = ellip(N,Rp,Rs,2*pi*Fp,'s');

% Compute and plot the frequency response

omega = [0: 200: 12000*pi];

h = freqs(num,den,omega);

plot (omega/(2*pi),20*log10(abs(h)));

xlabel('Frequency, Hz'); ylabel('Gain, dB');

OUTPUT:

Order = 5

Passband edge frequency in Hz = 2000

Passband ripple in dB = 1

Minimum stopband attenuation in dB = 40