The AM/FM/PM Function has three inputs: frequency (Freq), phase (Phase), and magnitude (Mag). Freq is integrated with respect to time, and then normalized between -2p and +2p. Phase is added to this, and the sum is used as an argument to either a Sine or a Cosine function. This result is then multiplied by Mag, and appears on the output line.
If the frequency and phase are kept constant, the output is an amplitude modulation (AM) of the input Mag. If phase and magnitude are kept constant, the output is a frequency modulation (FM) of the input Freq. If frequency and magnitude are kept constant, the output is a phase modulation (PM) of the input Phase.
A practical example of controlling all three inputs is with a source model. The magnitude signal can be used to ramp the source on at start-up; the frequency signal may be adjusted to follow changes in the system frequency; and the phase signal could be used to control the amount of power leaving the source.
This component can also be used simple as a sinusoidal waveform generator.
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Base Carrier Function |
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Select sine or cosine function as carrier signal |
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Frequency Input Units |
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Select input frequency signal in rad/s or Hz |
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Phase Input Units |
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Select input phase signal in radians or degrees |