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# Amplitude Demodulation Essay

677 words - 3 pages

EXPERIMENT 4
AMPLITUDE DEMODULATION
OBJECTIVE:
* To Study AM detection using an envelope detector
* To build an AM envelop detector.
Theory and Background:
Diode detector is simplest and most effective types of detector. The output of this circuit is almost linear and therefore harmonic outputs are limited. The abrupt non linearity occurs for the negative half cycle. The modulated carrier is introduced into the tuned circuit made up of LC1. Since the diode only conducts only during the half cycles and gives the result. Although the average input voltage is zero, the average output voltage across R always varies above zero. The low pass filter, made up of capacitor C2 and resistor ...view middle of the document...

OBSERVATIONS AND CALCULATIONS
Amplitude | Carrier frequency | Signal | OutputFrequencies | ModulationIndex | Comments |
| | Amplitude | Frequency | | | |
1v | 200kHz | 1v | 5KHz | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | |
| | | | | |

DISCUSSION AND CONCLUSION
What happened to the output waveform if the filter capacitor has a small value?
If the capacitor has a very small value the output will reassemble the half rectified signal. This is sometimes called rectifier distortion.
What happened to the output wave form if the filter capacitor has a large value?
If the filter capacitor has a large value the slope of output waveform cannot follow the training slope of the envelope. This type of distortion is called diagonal clipping.
What is the difference between the detected signal and the original signal?
It is approximately the same shape but the amplitude is much smaller due to loading Effect also the output signal is shifted from the massage signal due to the filter phase effect.

What is the effect on...

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