JPL's Wireless Communication Reference Website Chapter: Analog and Digital Transmission Section: Analog Modulation

Phase Modulation

Figure: Phasor Diagram for Narrowband PM with tonal modulation.

In the animation below, we demonstrate the phasor motion for PM with tonal modulation. The three blue phasor represent

• the carrier, i.e., a stationary inphase component.
• the lower sideband, rotating clockwise
• the upper sideband, rotating counterclockwise

Java Applet: Phasor diagram of a carrier with AM tone modulation.

JPL's Wireless Communication Reference Website © Jean-Paul M.G. Linnartz, 1993, 1996.