3. Graphical representations of the frequency response of a linear system
3.1 Notions of gain and phase
The frequency response T (jω) is a complex number that can be decomposed into a modulus and an argument:
T (jω) = A (ω) exp jφ(ω)
with
and φ (ω) = arg T (jω).
Knowledge of A (ω) and φ (ω) allows us to fully characterize T (jω), and therefore the system as we saw earlier (§ 2.2).
As in general, A (ω) is a decreasing function of ω; we usually speak of attenuation instead...
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Graphical representations of the frequency response of a linear system
Analysis of linear servo systems
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