% /home/dimarzio/Documents/working/12297/matlab/lpf.m
% Wed Sep 12 12:50:50 2018
R1=1000;R2=5000;C=1.0e-6;
f=10.^[0:.01:6];
Z2=1./(1/R2+1./(1./(1j*2*pi*f*C)));
Av=-Z2/R1;
AvLow=-R2/R1*ones(size(Av));
AvHigh=-1./(1j*2*pi*f*C)/R1;
figure;semilogx(f,20*log10(abs(Av)),...
		f,20*log10(abs(AvLow)),...
		f,20*log10(abs(AvHigh)));grid on;
xlabel('f, Frequency, Hz.');
ylabel('A_v, Gain, dB');

figure;semilogx(f,angle(Av)*180/pi);grid on;
xlabel('f, Frequency, Hz.');
ylabel('Phase, Degrees');

Published with MATLAB® R2017a