405exp4w

# 405exp4w - other a small signal diode(i.e 1N4148 3...

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California State Polytechnic University, Pomona Department of Electrical and Computer Engineering ECE 405L Electronic Communications Laboratory Experiment #4 Properties of Amplitude Demodulation Objective: To investigate the mathematical properties of Amplitude Demodulation waveforms using common communications laboratory equipment. Pre-lab: 1) Calculate the Fourier Spectrum for a sinusoidal amplitude modulated waveform having a sinusoidal carrier of 1 MHz, a sinusoidal modulation of 10 KHz, and modulation percentage of: a) 50% b) 100% Set the amplitude of the carrier to at least 3 volts peak. 2) Calculate the Fourier Spectrum for a switching amplitude demodulated waveform. You will need to obtain two different diodes for this part of the experiment. One should be a power diode (i.e. 1N4001) and the
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Unformatted text preview: other a small signal diode (i.e. 1N4148). 3) Calculate the resulting Fourier Spectrum when you pass the waveforms of part 1 through the demodulator of part 2. Lab: Using the equipment in the laboratory construct the amplitude modulated waveforms described in the pre-lab then measure and record the Fourier Spectrums for each part described above. Make plots of the time and frequency (both continuous and discrete) domains for each waveform. Bring the necessary parts to construct the demodulator designed in the pre-lab part 2. Pass the waveforms through the demodulator and record all appropriate waveforms. Post-Lab: In your report explain the differences between your calculated and your measured values. Mark-up each of your print-outs as part of your explanations....
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