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1)What is the purpose of the parallel combination of the resistorand capacitor in the envelope detector? Explain how this part ofthe circuit works
2) Common radio uses two modulation schemes-they are AM and FM.Explain very briefly what the FM scheme is. How does it differ fromAM? what are the advantages and disadvantages of each scheme?
3)Which scheme AM or FM has better audio quality? Why?
Design an operational amplifier cicuit that has the following specifications: Gain=-3; Input impedence>20 kohm You have unlimited number of resistors of values 1,2,5, and 10 kohms and LM741 op amps.
An inductive load that draws 23 kW of power and 150 A ofcurrent is connected in parallel with another inductive load thatdraws 60 kW at 200 A. The combination is connected to a 600 Vsource. (a) Make a table showing each load and its complex power.
Let the current int he circuit be is(t) = u(t -1) and the initial voltage in the cap be Vc(0) = -1 volts. PLOT the voltage in the cap Vc(t) for all times. Suppose we double the current is(t) = 2u(t) - u(t -1) but keep same initial condition
A finite state recognizer or sequence detector has one input (X) and one output (Z). The output is asserted high (Z=1) whenever the input sequence 1101 has been observed during the past four clock cycles, as long as 1110 has never been observed.
find the Laplace transformation to find the v(t) that satisfies the following firs-order differential equation : a) 500 dv(t)/d(t) +2500 v(t)= 0 , v(-0)= 100V b) dv(t)/d(t) +200v(t)= 400u(t)V , v(-0)= -100V
An emitter-follower circuit is built using an npn transistor with ß=100 and with RE =1k-ohm. What is the input impedance of the open circuit. If a load of 100-ohm is connected to the output of the circuit, what is the input impedance
A discrete-time LTI system has the impulse response h[n]. Use linearity and time invariance to determine the system output y[n] if the input is h[n]={-2:n=-1, 3:n=0, 2:n=3, -4:n=5}
Consider a causal LTI (Linear-time invariant) system described by the following differential equation: \(\frac{d^2}{dt^2}y(t) + 5\frac{d}{dt}y(t) + 6y(t) = \frac{d}{dt}x(t) + x(t)\) a) Determine the transfer function of this system.
Explain how to use the knowledge of Structure-Property-Processing-Perfomance relationship to improve on a device based on semiconductivity. Name the device, describe how it is made, the principle guiding its function and application.
Make a plot of group velocity versus frequency for frequencies from 0 Hz to 500 kHz. Your plot should have 3 different curves for the three modes of propagation. Be sure to identify the modes and all cutoff and resonant frequencies clearly.
A resistive temperature sensor is modeled as R(T) = 100 +0.0039(T-25)+1.0x10^-5(T-25)^2 where T is in degrees C. Calculate the tempco and sensitivity at T = 50 degrees C.
Within a region of free space, charge density is given as ρv=ρorcosθ/a c/m3, where ρo and a are constants. Find the total charge lying within (a) the sphere, r
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