CTB

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./(2jpif10e-12)); % create ABCD matrix for a series capacity of 10pF a = a_mul(a, a_shunt(1/50ones(size(f)))); % append a 50 Ohms shunt resistance a = a_mul(a, a_series(2jpif*20e-9)); % append a 20nH series inductance s = a2s(a); % convert to s-parameter

figure plot(f,20log10(squeeze(abs(s(1,1,:))))); hold on; grid on; plot(f,20log10(squeeze(abs(s(2,1,:)))),'r--'); ylim([-20 0]); legend('s11','s21');

Copyright (c) 2006-2013 Sebastian Held, Thorsten Liebig. All rights reserved.