Difference Between PAM, PWM and PPM:
The Difference between PAM, PWM and PPM is given below:
PAM |
PWM or PDM |
PPM |
| Amplitude of the pulse is proportional to the amplitude of modulating signal. | Width of the pulse is proportional to amplitude of modulating signal. | The relative position of the pulse is proportional to the amplitude of modulating signal. |
| The BW of the transmission channel depends on the width of the pulse. | The BW of the transmission channel depends on the rise time of the pulse. | The BW of the transmission channel depends on the rising time of the pulse. |
| The instantaneous power of the transmitter varies. | The instantaneous power of the transmitter varies. | The instantaneous power of the transmitter remains constant. |
| Noise interference is high. | Noise interference is minimum. | Noise interference is minimum. |
| System is complex and similar to amplitude modulation. | System is simple and similar to frequency modulation. | System is simple and similar to phase modulation. |