Hello guys, I hope you all are doing great. In today’s tutorial, we will discuss the Difference Between PAM, PWM and PPM. There are most commonly used techniques for analog pulse modulation which are PAM, PWM and PPM. The basic difference among them is pulse carrier which changes according to the modulating signal.For PWM the width of pulse of a carrier wave is changes with respect to the modulating signal

For PAM the amplitude of pulse carrier signal changes according to the amplitude of analog modulating signal.. While in PPM the location of pulses changes with respect to the modulating signal. In today’s post, we will have a detailed look at these three techniques and find their differences. So let’s get started with Difference Between PAM, PWM and PPM.

Difference Between PAM, PWM and PPM

PAM

In this modulation, process data is changed in coded form with amplitude of sequence of the signal.
It is analog modulation where the amplitude of data changes in the sequence of the carrier signal.

PAM has two categories fist one is single polarity and the second one double polarity
In signal polarity the is dc signal is mixed to the signal
In double polarity, there is both negative and positive polarity are merged
Ethernet communication is done through the use of PAM
In this type of modulation the amplitude of the carrier wave changes.
It provides less noise immunity.
Its implementation process is like the Amplitude Modulation or AM.
The signal-to-noise ratio for this modulation is less.
It does not require synchronization of a pulse.
The pulse width decides the bandwidth wave.
Its power of transmission changes.
It needed less bandwidth.
The synchronization among transmitters and receivers does not need.

PWM

It is a technique that used to decrease the power of the electrical signals.
The voltage and current given to the load is regulated through the use of a switching system among the input and output.
It also called PDM

It used for the operation of different devices like motors that not affect the use of switching.
Its switching system should have such value that can not be fact the load.
The ratio over which it changes the power is regulated through load value.
Its power loss is very less
It used to operate with the digital circuits and used in the communication network
Its transmission power is not constant.
It requires a large bandwidth.
Its implementation process is like frequency modulation.
The variable parameter for PWM is the width of the carrier wave.
It provides high immunity to noise.
Its signal-to-noise ratio is moderate.
Like PAM there is no need for pulse synchronization.
Its bandwidth depends on the rise time of the pulse.
It did not need synchronization between transmitter and receiver.

PPM

The variable parameter for this modulation Category is the position of a carrier wave.
It provides high immunity towards the noise.
It needed a large bandwidth.