Environmental Engineering Reference
In-Depth Information
observe that the second harmonics is proportional to If the circuit is
perfectly linear (i.e., would be equal to
Therefore, the nonlinear block produces a second harmonic
component with amplitude equal to
This
component can be viewed as a spurious signal injected at the output of the
nonlinear block, as depicted in Fig. 7.6. It is subsequently processed by the
feedback loop and appears at the output terminal decreased by the loop gain
but evaluated at the
frequency of
the harmonic considered,
i.e.,
From the above discussion it follows that the nonlinear term
is
equal to
The nonlinear coefficient can be evaluated by following a
similar procedure. Neglecting the contribute due to
we get
