ANALOG COMMUNICATION
Pulse Width Modulation and
Demodulation Trainer
Contents
1. INTRODUCTION ................................................................................. 3
2. TECHNICAL SPECIFICATION ............................................................... 3
3. FEATURES .......................................................................................... 4
4. FRONT PANEL DIAGRAM ................................................................... 5
5. BLOCK DIAGRAM ............................................................................... 6
6. EXPERIMENTAL SECTION ................................................................... 7
6.1 EXPERIMENT - 1: Pulse Width Modulation and Demodulation (64 KHz
Carrier) ................................................................................................................8
6.2 EXPERIMENT - 2: Pulse Width Modulation and Demodulation (32 KHz
Carrier) ..............................................................................................................10
6.3 EXPERIMENT - 3: Pulse Width Modulation and Demodulation (16 KHz
Carrier) ..............................................................................................................12
6.4 EXPERIMENT - 4: Pulse Width Modulation and Demodulation (8 KHz
Carrier) ..............................................................................................................14
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1.INTRODUCTION
PS-DC-PWM is proposed to user friendly to process the
experiments and the trainer had all internal features like message
signal, carrier signal, power supply etc., and the trainer has online video
demonstration on our website.
2.TECHNICAL SPECIFICATION
Message Signal 1
: Frequency 500 Hz
: Amplitude 0 to 5V
Message Signal 2
: Frequency 1 KHz
: Amplitude 0 to 5V
Message Signal 3
: Frequency 2 KHz
: Amplitude 0 to 5V
Carrier Signal
: Frequency 8KHz, 16KHz, 32KHz, 64KHz
: Amplitude 2V
Modulator Type
: LM 311 Based (Comparator)
Demodulator
: 4th Order LPF
Amplifier
: Op-Amp Based
Supply Voltage (Board)
: +12V, +5V / DC
Supply current
: 100 mA (Minimum)
Input Voltage
: 230 V/ 50 Hz AC
Interface connectors
: 2mm socket
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3.FEATURES
 On-board message signal with variable amplitude
 Three different frequency message signal
 On Board four different frequency carrier signal
 PWM Modulation using comparator IC
 PWM Demodulation using Low Pass Filter
 Amplifier using Op-Amp
 Internal Power Supply +5V , +12V/ 500 mA
 Number of test point to study the PWM system
 User friendly front panel block diagram
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4.FRONT PANEL DIAGRAM
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5.BLOCK DIAGRAM
PWM Modulation
Message
Signal
PWM
Modulator
PWM O/P
Carrier
Signal
PWM Demodulation
PWM I/P
Low Pass Filter
Amplifier
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Demod O/P
6.EXPERIMENTAL SECTION
LIST OF EXPERIMENTS
Experiment 1:
To Study the PWM Modulation and Demodulation (64 KHz Carrier)
Experiment 2:
To Study the PWM Modulation and Demodulation (32 KHz Carrier)
Experiment 3:
To Study the PWM Modulation and Demodulation (16 KHz Carrier)
Experiment 4:
To Study the PWM Modulation and Demodulation (8 KHz Carrier)
APPARATUS REQUIERED OF EXPERIMENTS
1. PWM Trainer
: 1 No
2. Patch chord
: 4 No’s
3. Power chord
: 1 No
4. Manual
: 1 No
5. CRO
: 1 No
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6.1 EXPERIMENT - 1: Pulse Width Modulation and
Demodulation (64 KHz Carrier)
Aim
To study the Pulse Width modulation and Demodulation at 64KHz Carrier.
Apparatus Required
1.
2.
3.
4.
PWM Trainer
Power Chord
Patch Chords
CRO
- 01
- 01
- 04
- 01
Procedure
1. Connect power chord to PWM Trainer and switch ON the Trainer.
2. Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with
variable amplitude are available in message signal section.
3. Connect CRO between anyone test terminal from P1 to P3 and GND
Point to view the message signal with variable amplitude on CRO.
4. A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz,
16 KHz, 8 KHz) are available in carrier signal section.
5. Connect test terminal 64 KHz (P4) to P9 and view the amplified
Triangular wave carrier signal at P10 on CRO.
6. Now Connect anyone message signal as an input to pulse Width
Modulator (P8) using patch chord.
7. The Pulse width modulation is done and the modulated signal can be
tested using CRO with test point P11.
8. Patch the modulated signal in P11 with P12 in the demodulator section
as a low pass filter input.
9. The filtered output is available at test Point P13 connect it with
P14,and the final demodulated output is available at test point P15
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10.The amplifier pot meter can be varied and verify corresponding
waveform at P15
11.Note down all the wave forms.
Result
Thus, the Pulse Width modulation and demodulation at 64 KHz
Carrier was studied.
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6.2 EXPERIMENT - 2: Pulse Width Modulation and
Demodulation (32 KHz Carrier)
Aim
To study the Pulse Width modulation and Demodulation at 32KHz Carrier.
Apparatus Required
1.
2.
3.
4.
PWM Trainer
Power Chord
Patch Chords
CRO
- 01
- 01
- 04
- 01
Procedure
1. Connect power chord to PWM Trainer and switch ON the Trainer.
2. Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with
variable amplitude are available in message signal section.
3. Connect CRO between anyone test terminal from P1 to P3 and GND
Point to view the message signal with variable amplitude on CRO.
4. A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz,
16 KHz, 8 KHz) are available in carrier signal section.
5. Connect test terminal 32 KHz (P5) to P9 and view the amplified
Triangular wave carrier signal at P10 on CRO.
6. Now Connect anyone message signal as an input to pulse Width
Modulator (P8) using patch chord.
7. The Pulse width modulation is done and the modulated signal can be
tested using CRO with test point P11.
8. Patch the modulated signal in P11 with P12 in the demodulator section
as a low pass filter input.
9. The filtered output is available at test Point P13 connect it with
P14,and the final demodulated output is available at test point P15
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10.The amplifier pot meter can be varied and verify corresponding
waveform at P15
11.Note down all the wave forms.
Result
Thus, the Pulse Width modulation and demodulation at 32 KHz
Carrier was studied.
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6.3 EXPERIMENT - 3: Pulse Width Modulation and
Demodulation (16 KHz Carrier)
Aim
To study the Pulse Width modulation and Demodulation at 16KHz Carrier.
Apparatus Required
1.
2.
3.
4.
PWM Trainer
Power Chord
Patch Chords
CRO
- 01
- 01
- 04
- 01
Procedure
1. Connect power chord to PWM Trainer and switch ON the Trainer.
2. Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with
variable amplitude are available in message signal section.
3. Connect CRO between anyone test terminal from P1 to P3 and GND
Point to view the message signal with variable amplitude on CRO.
4. A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz,
16 KHz, 8 KHz) are available in carrier signal section.
5. Connect test terminal 16 KHz (P6) to P9 and view the amplified
Triangular wave carrier signal at P10 on CRO.
6. Now Connect anyone message signal as an input to pulse Width
Modulator (P8) using patch chord.
7. The Pulse width modulation is done and the modulated signal can be
tested using CRO with test point P11.
8. Patch the modulated signal in P11 with P12 in the demodulator section
as a low pass filter input.
9. The filtered output is available at test Point P13 connect it with
P14,and the final demodulated output is available at test point P15
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10.The amplifier pot meter can be varied and verify corresponding
waveform at P15
11.Note down all the wave forms.
Result
Thus, the Pulse Width modulation and demodulation at 16 KHz
Carrier was studied.
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6.4 EXPERIMENT - 4: Pulse Width Modulation and
Demodulation (8 KHz Carrier)
Aim
To study the Pulse Width modulation and Demodulation at 8KHz Carrier.
Apparatus Required
1.
2.
3.
4.
PWM Trainer
Power Chord
Patch Chords
CRO
- 01
- 01
- 04
- 01
Procedure
1. Connect power chord to PWM Trainer and switch ON the Trainer.
2. Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with
variable amplitude are available in message signal section.
3. Connect CRO between anyone test terminal from P1 to P3 and GND
Point to view the message signal with variable amplitude on CRO.
4. A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz,
16 KHz, 8 KHz) are available in carrier signal section.
5. Connect test terminal 8 KHz (P7) to P9 and view the amplified
Triangular wave carrier signal at P10 on CRO.
6. Now Connect anyone message signal as an input to pulse Width
Modulator (P8) using patch chord.
7. The Pulse width modulation is done and the modulated signal can be
tested using CRO with test point P11.
8. Patch the modulated signal in P11 with P12 in the demodulator section
as a low pass filter input.
9. The filtered output is available at test Point P13 connect it with
P14,and the final demodulated output is available at test point P15
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10.The amplifier pot meter can be varied and verify corresponding
waveform at P15
11.Note down all the wave forms.
Result
Thus, the Pulse Width modulation and demodulation at 8 KHz Carrier
was studied.
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