AER715 - Lab1 - Worksheet1

Describe the importance of using Bandpass filters in BFSK noncoherent demodulator.

In three-level PWM, the modulating process operates on each portion of the modulating function separately. The output peak value is still given by the depth of modulation, but the RMS value of the square wave is not Vin. Compute the THD for three-level PWM as a function of the depth of modulation (modulation index k).

If the maximum frequency deviation is 25kHz and modulating signal frequency is 12kHz.     6c.    Is this FM treated as narrow band or wide band?

With the aid of diagrams, show and explain how phase locking is used to demodulate a frequency-modulated (FM) signal.

2. Determine the peak phase deviation and modulation index for a PM modulator with a deviation sensitivity K = 2.5 rad/V and a modulating signal v(t) = 2 cos (212000t). %3D

What is the graph of the FM and PM magnitude spectrum with sine modulation?

Find the mathematical expression for the points 1 and 2 for this pratical AM-DSB/SC modulator

8. Determine: a) Noise Figure for an equivalent noise temperature of 75K. d) Equivalent noise temperature for a noise figure of 6dB.

Determine modulation index for a frequency modulator with a deviation sensitivity of 20 kHz/V and a modulating signal of 5cos 2π(2500)t

1) a) A 1V 5 kHz signal is put into a low pass filter with a cut-off frequency of 2 kHz. What will the  frequency of the output signal be?  b) A 1V 15 kHz sinewave signal is put into a low pass filter with a 2 kHz cut-off frequency. The output signal will have how much amplitude approximately?