Electrical Engineering Answers

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Design a synchronous counter by using T-flip-flop which can counter the sequence 0,

1,2,4,5,0….and rest states move to 0.

Design a Mod-5 asynchronous up counter using +ve edge triggering D flip flop.

Assume a 4-bit shift register using D flip flop which will take one clock cycle for loading the data and 3 clock cycles for getting the output, Identify the type of shift register and describe its operation with diagram.

Design a mealy machine whose output is 1 only when input 1101 is detected otherwise output is 0 with

1. Overlapping allowed condition, and
2. Overlapping not allowed condition.

Design a synchronous counter by using T-flip-flop which can counter the sequence 0,1,2,4,5,0….and rest states move to 0.

Q2/ The Quality Factor of a certain fiber optic communication system is three, find the value of BER in two methods. (By equation and by graph).

10 ^ 0

10 ^ - 3

Q = 5.99781 for P_{o} = 10 ^ - 9

0

8

10 ^ - 15

10 ^ - 12

10 ^ - 9

P .

10 ^ - 6

Q3/ Analogue optical fiber communications link have OSNR = 10 dBm and the signal

to noise ratio (SNR) = -200dBm. What is the indication about this system? Suggest a

solution about this problem.

9.

Question 9

Use this information to answer Question 9-12:

Consider a step pn junction made of silicon. The doping densities in the p- and n-sides are N_A ​=5×1015 cm^−3 and N_D =1×1014 cm^−3 , respectively.

Find the built-in potential in unit of V

Answers within 5% error will be considered correct.

10.

Question 10

Determine the depletion region width, x_n ​, in the n-side in unit of μm.

Answers within 5% error will be considered correct.

11.

Question 11

Determine the depletion region width, x_p ​, in the p-side in unit of μm.

Answers within 5% error will be considered correct.

12.

Question 12

What is the applied bias voltage (in V) required to have x_n =30μm.

Answers within 5% error will be considered correct.

The person’s data provided in the text file contains the following information: First Name (string), Last Name (string), Telephone (string), email (string). The program should read the data file at the start containing Persons data, store the data in the BST (binary search tree) and then present the following menu: Find and show person’s data given its email. Append new Person entered by user. Delete the data of a Person given its email. Show the data of all Persons. Exit Upon exit, overwrite the provided text file with the current data of the link list, so that the text file has the updated data

4.

Question 4

Use this information to answer Question 4-8:

Consider a step pn junction made of GaAs at T = 300 K. At zero bias, only 20% of the total depletion region width is in the p-side. The built-in potential ϕi =1.20V.

Determine the acceptor density in the p-side in unit of cm^-3.

Answers within 5% error will be considered correct.

5.

Question 5

Determine the donor density in the n-side in unit of cm^-3

Answers within 5% error will be considered correct.

6.

Question 6

Determine the depletion region width, x_n​, in the n-side in unit of μm.

Answers within 5% error will be considered correct.

7.

Question 7

Determine the depletion region width, x_p​, in the p-side in unit of μm.

Answers within 5% error will be considered correct.

8.

Question 8

Determine maximum electric field in unit of V/cm

Answers within 5% error will be considered correct.