PM Modulator Passband
Modulate using phase modulation
Library
Analog Passband Modulation, in Modulation
Description
The PM Modulator Passband block modulates using phase modulation. The output is a passband representation of the modulated signal. The output signal's frequency varies with the input signal's amplitude. Both the input and output signals are real scalar signals.
If the input is u(t) as a function of time t, then the output is
where
fc represents the Carrier frequency parameter
θ represents the Initial phase parameter
Kc represents the Phase deviation parameter
An appropriate Carrier frequency value is generally much higher than the highest frequency of the input signal. By the Nyquist sampling theorem, the reciprocal of the model's sample time (defined by the model's signal source) must exceed twice the Carrier frequency parameter.
This block works only with real inputs of type double. This block does
not work inside a triggered subsystem.
Parameters
- Carrier frequency (Hz)
The frequency of the carrier.
- Initial phase (rad)
The initial phase of the carrier in radians.
- Phase deviation (rad)
The phase deviation of the carrier frequency in radians. This is sometimes referred to as the "variation" in the phase.