Circuit Toolbox for Matlab/Octave --------------------------------- Small collection of useful functions to convert n-port network parameter such as scattering parameter, Z- or Y-parameter. Read/Write to touchstone file format to read with Qucs: http://qucs.sourceforge.net --- Examples: addpath('path/to/CTB'); % create ABCD matrix of a series C, shunt R and shunt L f = linspace(0,1e9,201); % frequency vector a = a_series(1./(2j*pi*f*10e-12)); % create ABCD matrix for a series capacity of 10pF a = a_mul(a, a_shunt(1/50*ones(size(f)))); % append a 50 Ohms shunt resistance a = a_mul(a, a_series(2j*pi*f*20e-9)); % append a 20nH series inductance s = a2s(a); % convert to s-parameter figure plot(f,20*log10(squeeze(abs(s(1,1,:))))); hold on; grid on; plot(f,20*log10(squeeze(abs(s(2,1,:)))),'r--'); ylim([-20 0]); legend('s11','s21'); --- Copyright (c) 2006-2013 Sebastian Held, Thorsten Liebig. All rights reserved.