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Highlights from
S-parameter toolbox (+ Z, Y, H, G, ABCD, T)

from S-parameter toolbox (+ Z, Y, H, G, ABCD, T) by tudor dima
Convert between N-port representations of RF circuits. Read / Write industry-standard files.

a2g(A); 
function g = a2g(A);

% G = a2g(ABCD)
%
% ABCD to Hybrid-G transformation
% only for 2x2 matrices

d = A(1,1)*A(2,2) - A(1,2)*A(2,1);

while abs(A(1,1)) < 1e-8
    A(1,1) = A(1,1)*(1+rand*1e-8);
end;

g(1,1) = A(2,1)/A(1,1);
g(1,2) = -d/A(1,1);
g(2,1) = 1/A(1,1);
g(2,2) = A(1,2)/A(1,1);

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