Third Order Chebyshev High-Pass Filter Design, Study notes of Electrical Engineering

Download Third Order Chebyshev High-Pass Filter Design and more Study notes Electrical Engineering in PDF only on Docsity! 3rd Order Chebyshev High-Pass Filter 1 % Chebyshev High-Pass Filter using % Example 5-3 p 229 as a Low-Pass % Filter Prototype close all; % close all opened graphs clear all; % clear all variables figure; % open new graph % Normalized components from filter coefficient tables Ln1 = 3.3487; % Normalized Inductance Ln2 = 3.3487; % Normalized Inductance Cn1 = 0.7117; % Normalized Capacitance Rg = 50; % Source resistance RL = 50; % Load Resistance wc=2*pi*900e6; % Cutoff Frequency of 900 MHz % Transform the normalized low-pass values % to the normalized high-pass filter values Cn1hp = 1/(wc*Ln1); % Normalized High-Pass C1 Cn2hp = 1/(wc*Ln2); % Normalized High-Pass C2 Ln1hp = 1/(wc*Cn1); % Normalized High-Pass L1 % Denormalize the High-Pass Component Values C1 = Cn1hp/Rg; C2 = Cn2hp/Rg; L1 = Ln1hp*Rg; f = 1; for i=1:4000; w=2*pi*f; ZC1=1./(j*w*C1); ZC2=1./(j*w*C2); ZL1=j*w*L1; YL1=1./ZL1; GL=1./RL; % Define the ABCD matrices for each element of the filter A0=[1 Rg;0 1]; A1=[1 ZC1;0 1]; A2=[1 0;YL1 1]; A3=[1 ZC2;0 1]; A4=[1 0;GL 1]; ABCD=A0*A1*A2*A3*A4; freq(i)=f; H(i)=2.*1/(ABCD(1)); f=f+0.002*wc/(2*pi); end subplot(211), semilogx(freq,20*log10(abs(H)));grid on; ylim([-50 10]); title('3rd Order Chebyshev High-Pass Filter Response'); xlabel('Frequency, Hz'); ylabel('Attenuation, dB'); phase=atan(imag(H)./real(H)); subplot(212), semilogx(freq,phase/pi*180);grid on; xlim([1e8 1e10]); xlabel('Frequency, Hz'); ylabel('Phase, deg.'); Docsity.com