Romain Liechti asked . 2022-03-23

Adjust the phase offset when using data from 'bode'

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Correct phase offset issues in your bode plots using our guide Learn how to adjust phase data for accurate analysis simulation. Get started now

bode , phase , adjust , offset

Expert Answer

Neeta Dsouza answered . 2025-04-25 22:40:44

if you want - as you write - stick to the bode output you should correct the phase by a reference phase shift.

% create tf
sys = tf(1,[1 0]);

% calculate frequency response using bode
w = 2*pi*logspace(log10(0.1),log10(1e5),1000);
[mag,phase,wout] = bode(sys,w);

mag = squeeze(mag);
phase = squeeze(phase);

% correct phase
w_ref = 2*pi*1; % reference is 1 Hz here, 0 works as well for DC
[~,corrPhase,~] = bode(sys,w_ref);

phase = phase-corrPhase;

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