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06 ask, Study notes of Digital & Analog Electronics

Motilal Nehru National Institute of TechnologyDigital & Analog Electronics

Amplitude shift keying lab mannual

Typology: Study notes

2014/2015

Uploaded on 01/14/2015

shashigcet
shashigcet 🇮🇳

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EXPERIMENT NUMBER 1(a)
Amplitude Shift Keying Modulator (ASK)
AIM: To study and implement ASK modulation and demodulation schemes and to observe the waveform.
EQUIPMENT REQUIRED:
Equipment Range Quantity
CRO (0-20) MHz 1
Function Generator (0-1) MHz 2
Power Supply (0-30) V 1
+5V 1
COMPONENTS REQUIRED:
Component Value Quantity
Op-amp 741 1
Transistor BC107 1
Resistor 1 kΩ 5
10 kΩ (po t) 1
Capacitor 0.01µF 2
CIRCUIT DIAGRAM:
pf3
pf4

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EXPERIMENT NUMBER 1(a)

Amplitude Shift Keying Modulator (ASK)

AIM: To study and implement ASK modulation and demodulation schemes and to observe the waveform.

EQUIPMENT REQUIRED:

Equipment Range Quantity

CRO (0-20) MHz 1 Function Generator (0-1) MHz 2 Power Supply (0-30) V 1 +5V 1

COMPONENTS REQUIRED:

Component Value Quantity

Op-amp 741 1 Transistor BC107 1 Resistor 1 kΩ 5 10 kΩ (pot) 1 Capacitor 0.01μF 2

CIRCUIT DIAGRAM:

THEORY:

To represent a digital data, finite number of distinct signals is used. ASK uses a finite number of amplitudes, each assigned a unique pattern of binary digit. Each amplitude signal encodes an equal number of bits. Each pattern of bits forms the symbol that is represented by the particular amplitude. In digital communications ASK is a modulation process, which imparts to a sinusoid two or more discrete amplitude levels. These are related to the number of levels adopted by the digital message.

PROCEDURE:

  1. Connections are made as per the circuit diagram.
  2. Set input signal (square wave) say 1V, 1 kHz using a function generator and carrier signal (sine wave) say 1V, 10 kHz using another generator.
  3. Observe the output waveform on the CRO.
  4. Plot the observed waveform on the CRO.

WAVEFORM:

PROCEDURE:

  1. Connections are made as per the circuit diagram.
  2. Give the ASK modulated signal as input the circuit.

3. Observe the output waveform on the CRO.

4. Vary the V ref (0-5V) and observe the corresponding waveform on the CRO.

WAVEFORM: