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QUESTION

# An amplitude modulator operates at 27 0 C and has input resistance of 200 k, output resistance of 10k, NF of 3 dB and bandwidth of 200 kHz.

An amplitude modulator operates at 270 C and has input resistance of 200 kΩ, output

resistance of 10kΩ, NF of 3 dB and bandwidth of 200 kHz. An 8 V peak carrier sine wave

of is amplitude modulated by a square wave information signal with peak value of 5 V.

a) Calculate the total power of the 2 input signals

b) Draw the modulated waveform and calculate the maximum and minimum

values of the modulated waveform. Assume that the carrier frequency is 4

times the information frequency for the drawing. This is unrealistic in practice,

but this will make it easier to draw the waveform.

c) What is the modulation index of the system?

d) Calculate the power of the output waveform.

e) What is the output noise power of the modulator? Consider the input signal