BEN-GURION UNIVERSITY OF THE NEGEV
Linearization of Sources
for Angle Modulation
PM – Nonlinear source
In the case of phase modulation there are two nonzero components of the real and imaginary parts of excitation.
The splitting network multiplies the input signal by a constant and makes it as as argument of Cosine in the real component and the Sine in the imaginary component.
This network includes nonlinear elements.
Nevertheless, for small signal analysis, the Cosine of small angle is approximately one, and the Sine of small angle is approximately angle itself.
Thus for real component we have a constant
And for imaginary component – the input signal multiplied by constant.
This network is linear and suitable for AC analysis, using phasor input VAC