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electricalstudent.com Latest Questions

hwmadeeasy
hwmadeeasy
Asked: April 9, 2022In: control systems engineering

Use frequency response methods to design a lag -lead compensator for a unity feedback system with G(S) = K(S + 7/IS(S + 5)(5 + 7)] And the following specifications: percent overshoot = 15%, settling time = 0.1 sec, and Ky= 1000.

lag lead compensator design
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hwmadeeasy
hwmadeeasy
Asked: March 27, 2022In: control systems engineering

The unity feedback system with G(S) = K/S(S + 7) is operating with 15 % overshoot. Using frequency response techniques, design a compensator to yield Kv = 50 with the phase margin frequency and phase margin remaining approximately the same as in the uncompensated system.

compensator designing using frequency response method
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hwmadeeasy
hwmadeeasy
Asked: March 21, 2022In: MATLAB simulations

1.) Use dsolve to obtain a symbolic expression for the zero-input response for the following system:  y”’+8y”+2521y’+5018y=f”+5018f, y(0)=1 ,y'(0)=1,y”(0)=0 2.) Plot the zero-input response for the system from part 1 with 0 ≤ t ≤ 4.  3.) Create a system object using tf for the system from part 1 and obtain the zero-state impulse and step response using impulse and step functions. 

Exercises  1.) Use dsolve to obtain a symbolic expression for the zero-input response for the following system:  y”’+8y”+2521y’+5018y=f”+5018f, y(0)=1 ,y'(0)=1,y”(0)=0 2.) Plot the zero-input response for the system from part 1 with 0 ≤ t ≤ 4.  3.) Create a system object using tf ...

ece355lsignals and system ece 355l spring 2022 lab 7
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hwmadeeasy
hwmadeeasy
Asked: February 21, 2022In: analog and digital communication systems

Problem 6 Consider a superheterodyne receiver for standard AM radio. a. If you wish to receive a radio station at 1345 𝑘𝐻𝑧, what local oscillator frequency is needed? (Let 𝑓𝐼𝐹=255 𝑘𝐻𝑧) b. What is the “image station” we need to watch out for using this local oscillator frequency? c. Sketch example spectra to illustrate how the local oscillator effectively shifts a transmitted signal spectrum centered at 1345 𝑘𝐻𝑧 to on that is centered at 255 𝑘𝐻𝑧.

Problem 6  Consider a superheterodyne receiver for standard AM radio.  a. If you wish to receive a radio station at 1345 𝑘𝐻𝑧, what local oscillator frequency is needed? (Let 𝑓𝐼𝐹=255 𝑘𝐻𝑧)  b. What is the “image station” we need to watch out for ...

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hwmadeeasy
hwmadeeasy
Asked: February 21, 2022In: analog and digital communication systems

4 Problem 5 Answer the questions a. Briefly show the advantages and disadvantages of DSB-LC. b. Briefly show the advantages of DSB-SC compared to DSB-LC. c. Briefly explain the advantages of using QAM. Is QAM always better than DSB-SC?

4  Problem 5  Answer the questions  a. Briefly show the advantages and disadvantages of DSB-LC.  b. Briefly show the advantages of DSB-SC compared to DSB-LC.  c. Briefly explain the advantages of using QAM. Is QAM always better than DSB-SC? 

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hwmadeeasy
hwmadeeasy
Asked: February 21, 2022In: analog and digital communication systems

Problem 4  Consider a message signal 𝑚(𝑡) with bandwidth 𝑊=2 𝑘𝐻𝑧, applied to a DSB-SC modulator, s.t., 𝑠(𝑡)=𝐴𝑐𝑚(𝑡)cos(2𝜋𝑓𝑐𝑡). Assuming perfect synchronism between the carrier waves in the modulator and detector.  a. Determine (sketch) the spectrum of the detector output when 𝑓𝑐=1 𝑘𝐻𝑧. (Note: 𝑀(𝑓) is shown in the figure, and 𝑀(0)=1.)  b. Find the lowest 𝑓𝑐 for which each component of the modulated wave 𝑠(𝑡) is uniquely determined by 𝑚(𝑡). Sketch the spectrum of the detector output with the lowest 𝑓𝑐 that you have required. 

Problem 4  Consider a message signal 𝑚(𝑡) with bandwidth 𝑊=2 𝑘𝐻𝑧, applied to a DSB-SC modulator, s.t., 𝑠(𝑡)=𝐴𝑐𝑚(𝑡)cos(2𝜋𝑓𝑐𝑡). Assuming perfect synchronism between the carrier waves in the modulator and detector.  a. Determine (sketch) the spectrum of the detector output when 𝑓𝑐=1 ...

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hwmadeeasy
hwmadeeasy
Asked: February 21, 2022In: analog and digital communication systems

Consider a message signal 𝑚(𝑡)=cos(4𝜋𝑡)volts(1𝛺), and carrier 𝑐(𝑡)=cos(20𝜋𝑡) 𝑉(1Ω). Assuming 𝑥(𝑡)=[3𝑚(𝑡)+5]𝑐(𝑡), (DSB-LC).  a. What is the modulation index?  b. Find the closed form of 𝑋(𝑓),  c. Sketch 𝑋(𝑓)  d. Find the power developed across a load of 75 ohm due to this AM wave.  e. What is the efficiency 𝜂 (ratio of side band power to total power). 

Consider a message signal 𝑚(𝑡)=cos(4𝜋𝑡)volts(1𝛺), and carrier 𝑐(𝑡)=cos(20𝜋𝑡) 𝑉(1Ω). Assuming 𝑥(𝑡)=[3𝑚(𝑡)+5]𝑐(𝑡), (DSB-LC).  a. What is the modulation index?  b. Find the closed form of 𝑋(𝑓),  c. Sketch 𝑋(𝑓)  d. Find the power developed across a load of 75 ohm due to this AM wave.  e. ...

ece 401: communication systems
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hwmadeeasy
hwmadeeasy
Asked: February 21, 2022In: analog and digital communication systems

Problem 2 Find the energy spectral density (ESD), 𝑆𝑋(𝑓), of 𝑠(𝑡)=𝑒5𝑡𝑢(−𝑡).

 Problem 2  Find the energy spectral density (ESD), 𝑆𝑋(𝑓), of 𝑠(𝑡)=e^5𝑡𝑢(−𝑡). 

ece 401: communication systems
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hwmadeeasy
hwmadeeasy
Asked: February 21, 2022In: analog and digital communication systems

Problem 1 Find the Fourier Transform of the single sine pulse shown in the figure.

ece 401: communication systems
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hwmadeeasy
hwmadeeasy
Asked: February 20, 2022In: control systems engineering

For the system, design minor loop rate feedback compensation. Damping ratio for minor loop’s dominant poles: 0.7. Damping ratio for the closed-loop dominant poles: 0.5.

minor loop rate feedback compensation
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