What is the meaning of positive phase in a bode plot?

[kandelabr]

Homework Statement

I have a bode plot with a positive phase.

Homework Equations

this is a MATLAB code for the thing

% bode phase plot
w = logspace(1, 4, 100);
G = 100*(1+0.017i*w)./(1i.*w.*(1+0.05i.*w).*(1+0.0025i.*w).*(1+0.001i.*w));
fi = atand(imag(G)./real(G));
semilogx(w, fi); % x-axis: log(omega*j), y-axis: phase in degrees

The Attempt at a Solution

Nothing to solve, there's just one thing I don't get: if phase means "relation between input and output signal", how can output signal come before the input?

 

[kandelabr]

OK, so i forgot G >> 20*log(G), and so the diagram is wrong, but still, the question remains the same - see this diagram:

http://en.wikipedia.org/wiki/File:Bode_High-Pass.PNG

 

[gneill]

Keep in mind that the signals being compared are not starting from some t=0. They are a depiction of some steady-state relationship between theoretically eternal sinusoids, and as such can exhibit a relative phase shift.

 

[kandelabr]

yeah, i thought this would be the explanation, and i neglected that bode plot is steady-state only.

thanks!