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Guide Presented by
Mr.M Cheenya V.Abhinav Kumar 11E31A0422
Asst.Professor K.Shiva Kumar 11E31A0423
K.Rajashekhar 11E31A042...
INTRODUCTION
 Modulation:
Modulation can be defined as the process of varying a
parameter of carrier signal in accordance...
Types of modulation techniques
1. PAM--Pulse Amplitude Modulation
2. PWM—Pulse Width Modulation
3. PPM—Pulse Position Modu...
What is PWM…?
 Pulse width modulation is a technique that generates
variable width signal generally based on modulator si...
Block Diagram of PWM
Power supply
Transformer
 It is a device used to increment or decrement the input
voltage as per the requirement.
 In this we used st...
Rectifier
 A circuit which is used to convert A.C to D.C is known as
rectifier.
Voltage Regulator
 Here we used LM-7812 Voltage regulator.
 It is used to supply a stable voltage.
LED
 LED is a two lead semiconductor light source.
 It resembles a basic pn-junction diode, which emits light
when activ...
Pulse width modulation
 PWM is a modulation technique, which converts an
analog signal into a digital signal for transmis...
Circuit diagram
555 Timer
Features of IC 555
 Maximum operating voltage 16V.
 Operates in the temperature range of -55 to 125 degrees.
 Maximum o...
Applications of 555 timer
 Ramp and Square wave generator.
 Frequency dividers.
 Voltage controlled oscillators.
 Puls...
Output waveform of Modulation
Demodulation
 Demodulation is the act of extracting the original
information bearing signal from a modulated carrier wave...
Pulse width demodulation
Working of demodulation
 The regenerated PWM is then applied to the ramp
generator & synchronization generator.
 The ram...
Output waveforms
of demodulation
Results
 Input waveform
Output waveform
Advantages
 Low Noise
 Low power consumption
 High efficient
 Does not require synchronization between transmitter
and...
Applications
 Telecommunications
 Voltage regulation
 Power delivery
 Amplification
 Use as ADC
Conclusion
 The design of a compact circuit board with good track
routing requires experience in PCB design.
 With the h...
THANK YOU
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PULSE WIDTH MODULATION &DEMODULATION

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Pulse width modulation is a technique that generates variable width signal generally based on modulator signal information

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PULSE WIDTH MODULATION &DEMODULATION

  1. 1. Guide Presented by Mr.M Cheenya V.Abhinav Kumar 11E31A0422 Asst.Professor K.Shiva Kumar 11E31A0423 K.Rajashekhar 11E31A0424 K.Chaithanya Sree 11E31A0428 K.Pramitha 11E31A0429
  2. 2. INTRODUCTION  Modulation: Modulation can be defined as the process of varying a parameter of carrier signal in accordance with the instantaneous value of the message signal.  Modulation is used to reduce the size of the antenna and increases efficiency.
  3. 3. Types of modulation techniques 1. PAM--Pulse Amplitude Modulation 2. PWM—Pulse Width Modulation 3. PPM—Pulse Position Modulation
  4. 4. What is PWM…?  Pulse width modulation is a technique that generates variable width signal generally based on modulator signal information.  The general purpose of PWM is to control power delivery.
  5. 5. Block Diagram of PWM
  6. 6. Power supply
  7. 7. Transformer  It is a device used to increment or decrement the input voltage as per the requirement.  In this we used step down transformer to convert 230V AC to 12V AC.
  8. 8. Rectifier  A circuit which is used to convert A.C to D.C is known as rectifier.
  9. 9. Voltage Regulator  Here we used LM-7812 Voltage regulator.  It is used to supply a stable voltage.
  10. 10. LED  LED is a two lead semiconductor light source.  It resembles a basic pn-junction diode, which emits light when active.  Representation of LED
  11. 11. Pulse width modulation  PWM is a modulation technique, which converts an analog signal into a digital signal for transmission.  PWM converts an audio signal into a sequence of pulses having constant amplitude, but the width is proportional to amplitude of an audio signal.
  12. 12. Circuit diagram
  13. 13. 555 Timer
  14. 14. Features of IC 555  Maximum operating voltage 16V.  Operates in the temperature range of -55 to 125 degrees.  Maximum output current 200mA.  8-pin metal can.
  15. 15. Applications of 555 timer  Ramp and Square wave generator.  Frequency dividers.  Voltage controlled oscillators.  Pulse generators .
  16. 16. Output waveform of Modulation
  17. 17. Demodulation  Demodulation is the act of extracting the original information bearing signal from a modulated carrier wave.  It is used to recover the information content from the modulated carrier wave.
  18. 18. Pulse width demodulation
  19. 19. Working of demodulation  The regenerated PWM is then applied to the ramp generator & synchronization generator.  The ramp generator produces ramps for the duration of pulses such that height of ramps are proportional to the width of ramp pulses.  Synchronous pulse generator produces references pulses with constant amplitude and pulse width.
  20. 20. Output waveforms of demodulation
  21. 21. Results  Input waveform
  22. 22. Output waveform
  23. 23. Advantages  Low Noise  Low power consumption  High efficient  Does not require synchronization between transmitter and receiver.
  24. 24. Applications  Telecommunications  Voltage regulation  Power delivery  Amplification  Use as ADC
  25. 25. Conclusion  The design of a compact circuit board with good track routing requires experience in PCB design.  With the help of protel software the kit is developed and can be used as an experimental kit, it provides user friendly environment for the users.
  26. 26. THANK YOU

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