Experiment on Demodulation of an Amplitude Modulated Signal.

 

Experiment Name: Demodulation of an Amplitude Modulated Signal.

 

Required Apparatus:

        I.            Power Supply

      II.            20 MHz Oscilloscope

    III.            Connectors

    IV.            Amplitude Modulation Transmitter KIT (ACL 01)

·         Balanced Modulator -1

Carrier Input: 1-1000 KHz; Modulating Input: 0.1-1500 KHz

·         Function Generator [Frequency: 0.1-100 Hz]

·         Voltage Controlled Oscillator [Frequency: 500-1500 KHz]

      V.            Amplitude Demodulation Receiver KIT (ACL 02)

·         Local oscillator [Frequency: 900-2.1 MHz]

·         Frequency Converter [Output Frequency: 455 KHz]

    VI.            9F Amplifier [Central Frequency: 455 KHz; Gain: 32dB]

  VII.            Envelop Detector

 

Block Diagram:



Figure: AM Demodulation Circuit


Input/Output Waveshape:

 



Figure 01: Waveform of input message signal

 

 



Figure 02: Waveform of modulated signal in output



 


Figure 03: The Comparison between input signal and demodulated signal

 

 



Figure 04: The Comparison between input signal and demodulated signal (phase shifted 90 degree)


Discussion:

From this experiment, we observed the process of demodulation of an amplitude modulated signal. We also know about the function of mixer. We also see that how envelop detector works and how it helps to demodulate a signal.

 

Conclusion:

While doing the experiment, some precautions should be taken. Sometimes we can’t get the accurate wave shape because of the loose connection. So, we have to check the connection properly to get the accurate or proper wave shape.


1 Comments

  1. The best digital oscilloscope has to offer is a one of a kind experience. There are four different models that range from simple, entry-level models, to digital oscilloscopes that are more complex and provide more features.

    The Rigol DS1054Z is one of the more affordable and easy to use digital oscilloscopes on the market. It is targeted towards engineers who have some experience with this type of equipment but aren't experts. One of the most significant downsides to this model is its lack of advanced features which can hinder the user who does not know how to work the device effectively without them.

    The Rigol DS1054Z made a good impression on me. And we can expect a new model of this scope soon that will be improved.

    The DS1054Z is Rigol's latest oscilloscope in their DS1000 family, and is an upgrade to the original DS1000Z model.

    If you're looking for an affordable, dual-channel digital scope with a wide selection of communication interface options and basic measurements, the Rigol DS1054Z is worth consideration.

    ReplyDelete
Previous Post Next Post