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Problem: Consider the waveform x(t) shown below.
The above signal x(t) consists of a DC component plus a sinusoidal signal. (The terminology DC component means a component that is constant versus time.)
a. What is the frequency of the sinusoidal component?
b. Write an equation for the signal x(t) in the form x(t) in the form x(t) = B + Acos(ωot + ø) where -π , ø < π.
You can determine numerical values for all the amplitude, frequencies, and phases in your equation by inspection of the above graph.
c. Plot the two sided spectrum of the signal x(t). Show the complex amplitude for both the positive and negative frequency components contained in x(t).
Suppose the voltage across a telephone line at the subscriber drops from 48V to 10V when the phone goes off hook. If the telephone instrument has a resistance of 200 ohms when off hook and represents an open circuit
A dc machine is rated 5 hp with V_f = 240 V, V_a = 240 V, r_a = 0.63 ohms, and L_AF = 1.8 H. At rated condtions w_r = 127.7 rads/s and the total resistance of the field circuit is 240 ohms. a) Calculate the rated armature current.
Which requires more harmonics to accurately model it (triangle, square, and sawtooth) and why?
At what temperature are the two carrier densities equal?
Compare and contrast transmit and receive diversity. Describe how each diversity type lead to an improvement in system performance.
Assuming the material is GaAs, calculate the Quasi-Fermi levels if the injected carrier concentration is 2x1018 cm-3.You can use the effective mass approximation and consider only the heavy hole in the valence band.
Add Z1 = 3ej30 degree and Z2 = 4e -j60 degree together. Write your result in both rectangular and polar form. In polar form, indicate whether your angle is in radians or degree s. Multiply Z1 = -2 + j3 and Z2 = 4 + j2 together.
A continuous line of charge lies along the x-axis, extending from x= +xo to positive infinity. The line carries positive charge with a uniform linear charge density lambda not. What are (a) the magnitude
One of the ways to look at programming at the assembly-language level is to consider it as putting together code fragments that do various little jobs. (This is a little higher-level than just thinking of it as a sequence of machine instructions.)
Determine the transmission coefficient for the system for X=a where a is on the order of nanometers. Determine the transmission coefficient for the system for X=a where a is on the order of meters
Design a circuit that outputs 0 volts when the input is above2.5volts, and outputs 5 volts when the input is below 2.5 volts.You may use power supply voltages of +10V, 0V and -10V. Be sureyour circuit will drive a low resistance load.
A DC circuit has supply voltage 100V, impedance Z= 8+j6Ω. Calculate the stead DC current and power supplied to the circuit
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