Proposed Method – Small
Signal Analysis Using AC–Simulation

Amplitude modulation

The
source is linear and suitable for
AC analysis – as is

phasor

For example:
amplitude modulation.

Expanding the
expression of modulated signal into two orthogonal components, one can see
that in the case of AM [>>] only the real component U_{1}
exists. [>>] The splitting network is driven by a single signal u_{m}
is making the imaginary component – zero and real component U_{1}.
The dependent source multiplies the input signal by a constant and adds it to
a DC source that represents the amplitude of carrier. [>>] The network
is actually linear and we just have to replace the excitation u_{m}
by phasor source VAC for analysis.