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Advantages and disadvantages of pulse width modulation

PWM stands for pulse width modulation. It is a method used to control the output voltage of the converter by modulating

the width of the pulse of the output waveform. Here this article gives information about the advantages and disadvantages of

pulse width modulation to know more details about it.

Advantages of pulse width modulation :

Cheap to make;

Low power consumption;

Efficiency up to 90 %;

A signal can be separated very easily at demodulation and noise can be also separated easily;

High power handling capacity;

Can utilise very high frequency;

Little heat whilst working;

Noise interference is less;

Very energy efficient when used to convert the voltage or to light low energy bulb;

A system in moderate inefficiency among all three types;

Synchronisation between transmitter and receiver is not required unlike pulse position modulation (PPM);

Filter requirement is reduced;

Amplitude and frequency can be controlled independently;

Significance reduction in THD (total harmonic distortion) of load current.

Disadvantages of pulse width modulation :

The complexity of the circuit;

Voltage spikes;

The system requires a semiconductor device with low turn ON and turn OFF times. Hence they are very expensive;

Radiofrequency interference;

Electromagnetic noise;

Bandwidth should be large to use in communication;

High switching loss due to the high PWM frequency;

The instantaneous power of the transmitter is varied.

Advantages and disadvantages of pulse position modulation

PPM stands for pulse position modulation, in which a relative position of the pulse is propositional to an

amplitude of the modulating signal. Here this article gives information about the advantages and disadvantages

of pulse position modulation/

Advantages of pulse position modulation:

Signal and noise separation is very easy

PPM is a simple command from a transmitter to a receiver

Constant transmitted power output

This method is easy to separate out the signal from a noisy signal

Require very less power compare to pulse amplitude modulation (PAM) and PDM because of short duration pulse

Due to constant pulse width and amplitudes

Highest power efficiency among all three types

In this modulation, the amplitude is held constant thus less noise interference

Disadvantages of pulse position modulation:

Require very large bandwidth compare to PAM

A system has highest in complexity to implement

Highly sensitive to multi-pathway interference

Both devices are synchronised or differential pulse position modulation (PPM) is used

Advantages and disadvantages of pulse code modulation

The PCM stands for pulse code modulation, in which the analog speech waveform is sampled and converted into a

multi-bit digital code by an analog to digital converter. This article gives information about the pulse code

modulation advantages and disadvantages of to know more details about it.

Advantages of pulse code modulation :

It has a higher noise immunity

It has a higher transmitter efficiency

Easily multiplexed

Efficient SCR as well as bandwidth trade-off

Uniform transmission quality

Low manufacturing cost

Integrated digital circuit

Ease add and drop

It has secure

Efficient codes are readily available

A signal may be stored and time-scaled efficiently

Useful for long-distance communication

Increase utilization of the existing circuit

Better noise performance than an analog system

In this modulation, the compatibility of different classes of traffic in the network

Good performance over a very poor transmission path

The PCM convenient for long-distance communication

The effect of noise is further reduced due to the use of a repeater

Due to its digital nature, we can easily store PCM signals

we can use various kind of coding techniques so that only the desired person can decode the received signal

Disadvantages of pulse code modulation :

It requires large bandwidth as compared to other method called an analog system

Overloaded appears when modulation signal change between sampling, by an amount greater than the size of the step

The difference between the original analog signal and the translated digital signal is called quantization error

Encoding, decoding and also have quantizing circuit of PCM is very complex

Noise and cross talk leave low but rise attenuation

In this modulation integrated digital network can only be realized by gradual extension of noise.

Advantages and disadvantages of pulse amplitude modulation

PAM stands for pulse amplitude modulation in which amplitude of the pulse is proportional to the amplitude of the

modulating signal. So here this article gives the information about the advantages and disadvantages of pulse

amplitude modulation to know more details about it.

Advantages of pulse amplitude modulation :

Generation and detection is easy

This modulation is the base for all digital modulation techniques

It is a simple process for both modulation and demodulation techniques

PAM can generate other pulse modulation signals and can carry the message or information at the same time

No complex circuity is required for both transmission and reception.

Transmitter and receiver circuitry is simple and easy to construct

Disadvantages of pulse amplitude modulation :

Added noise cannot be removed easily as it has an impact on amplitude which carries information

Noise will be great

It is difficult to remove noise, as this amplitude part which carries information

Noise interference is higher

Nyquist criteria have high bandwidth required

Transmission bandwidth is too large

Power required for transmission is more

Instantaneous power of transmitter varies