Use the 74LS138 , to design an address decoder that will place 8K by 16bit RAM at a starting address of C000h and 8K RAM at a starting address of 6000h.

Research case studies on Southwest Airlines. Then answer the following question.

1. What is the Southwest business model and why is it so effective?

Instructions: 1. Solve the following problems in a MATLAB script. You will be allowed to submit only one script, please work all the problems in the same script (Hint: careful with variables names) 2. Show your work and make comments in the same script (Use %). Please write your name in the first line of the scrip with % 3. It is OK to work with other students, but what you submit should be your own work – not something copied from someone else.

Problem #1 (10 points): Using loops show the following calculation: ? ???? 25 3 ????=1

Problem #2 (15 points): When working with computer, microprocessors or digital systems most of the commands are represented in binary numbers, hexadecimal numbers, ASCII or octal. We want to write a code that do the following a. Inputs are decimal digits from 200 to 400 counting by 10 b. When the counter find a number smaller than 300 the result will be the same number converted into hexadecimal c. When the counter find 300 display “We are at 300 from now on the numbers will be display as binary numbers” d. When the counter find an number bigger than 300 the result will be the same number converted into binary

Problem #3 (25 points): As you make decisions over your 401K, you find one investment opportunity that will draw 09% interest per year added to your account. The trick about this investment is that you will need to cancel the investment as soon as you double the amount of money you put in the first time which could be any amount from $5000 - $7000. You will received statements of the balanced for the total years you invested until the balanced is doubled. Expected from this program: • Initialize balance, year, and interest rate. Your first year is denominated at year 0. • You will need to display the balance with headings “Year” and “Balance” until the balance is twice the original. • Please display the numbers with bank format Example: Initial Balance=4500.00 Year Balance 1.00 4905.00 2.00 5346.45 3.00 5827.63 4.00 6352.12 5.00 6923.81 6.00 7546.95 7.00 8226.18 8.00 8966.53 9.00 9773.52

Problem #4 (35 points): A friend ask you to babysit their 5 year old named Kylo-Ren. After the kid tablet run out of battery and is almost at the point to start screaming, you decide to play a game. Since you are an expert in MATLAB or at least love writing some easy scripts, you decide to work a game for him. You want MATLAB to generate a random integer number that KyloRen will guess. Expected from this program: • Generate a random integer (no higher than 25). Keep in mind that a 5 year old will probably do not want to play a game if it is too long or too short. • Ask the user to input a guess. Please specify how high the guess could be. • Check the guess given for the user. If the guess is too low tell the user: “Kylo-Ren, your guess is too low, please try again and enter a new guess number”. The same thing should happen if the guess is too high. • When the guess is equal to the random number please congratulate Kylo-Ren. • If you can add sounds to the game, Kylo-Ren will be more eager to play over and over again which will give you time to watch one episode of the Big Bang Theory. Plus you can get bonus points. Example: Please enter your guess between 1 and 20: 5 Sorry your guess is too low Please enter your next guess: 15 Sorry your guess is too high Please enter your next guess: 5 Sorry your guess is too low Please enter your next guess: 10 Sorry your guess is too low Please enter your next guess: 12 Sorry your guess is too low Please enter your next guess: 14 Sorry your guess is too high Please enter your next guess: 13 At last! :)

Problem #5 (15 points): You all know I like sports, especially baseball. What is your favorite sport? Expected from this program: • Show the options in a menu form for the user for them to press either Baseball, Football, Soccer, Track and Field, Other, and Quit Survey. • When display a fun fact for each sport as follows o Baseball - display “Bobby Richardson is the only player to win an MVP on the World Series losing team” o Football – display “It takes 600 cows to make one full season’s worth of NFL footballs” o Basketball – display “ Basketball was invented by a YMCA teacher in Springfield, MA” o Soccer – display “FC Barcelona wears UNICEF logo in their shirt while donating 1.5M euros each year – Reverse sponsorship” o Track and Field – display “UNC Charlotte Men T&F Team Won C-USA Championship this year” o Other – display “ Golf: The average golf ball has 336 dimples, Tennis: Tennis balls where change from white to yellow in 1972” o Quit Survey – display “Thanks for participate” Example: Panther: Keep Pounding Broncos are my option Thanks for participate

Problem #6 (20 points): We have set up a limit in current on a piece of equipment to be 0.45 Amps. When the system is running data is gather in the DAQ. The system generates a vector of 10 random numbers in one single column. The control system is comparing if the values of the result currents are higher than the limit set for the supplier. We need to project the results into a monitor for easy understanding and to take action over the equipment. If one of the parameters in the vector has a value higher than the limit, we will need to display a message that say “There is at least one current value measure above the limit”, if this is not true, please display “All values are below the limit. You can proceed with your data acquisition”.

A sinusoidal wave is a fundamental building block to the principle of Fourier transform. You are given a few sinusoidal waves below:

?(?) = sin(?) + cos(?)

?(?) = ???²(?) + ???²(?)

?(?) = 3 ∗ sin(?) + ???²(?)

Where ? varies from 2? ?? 3?. Create a Simulink model to graph the given waves parametricall

An N-Channel device has K’n = 50 µA / V^2, Vt = 0.8 V and W/L = 20. The device is operating as a switch for small Vds, utilizing a control voltage Vgs in the range 0 V to 5 V. Find the switch closures resistance, Rds and closure voltage, Vds obtained when Vgs = 5 V and Id = 1 ma. Recalling that Up (Miu)= 0.4 µ(n). What must W/L be for a p-channel device that provides the same performance as the n-channel device in this application?

Please no hand writing

Start a new Quartus project for D flip-flop with enable, reset, set, cp.

type the VHDL code

create the circuits in Quartus.

Cite 2 methods to deposit metal.

All the questions are related to linear system theory.(Book: Signals and systems 2nd edition)

Q1. What is difference between Fourier Series and Fourier Transform?

Q2. What is difference between Fourier transform, Laplace transform and Z transform?

Q3. Why we are interested in exponential signals?

Q4. How to understand causal system? If a LTI system is non-causal, what does it mean in real life?

Q5. What is the difference of the LTI system output when the input x(t)= exp(-2t) is changed to x(t)=exp(-2t)u(t)?

Q6. How to understand Region of convergence?

Q7. Why we need transforms?

Q8. After a continuous signal is converted to the discrete signal after sampling, what is the impact on the transform domain accordingly?

Write a program using interrupts to get data serially and send it to P2 while at the same time Timer 0 is generating a square wave of 5 kHz. We've been basing our code on the Intel 8051 microntroller and assembly language.

a) Show that BJTs provide significantly higher intrinsic gain (small signal) than MOSFETs. Use the minimum Vov, 100mV, and a typical ? of 0.1. For the BJT, Early Voltages often lie between 50-100V; use the smallest value.

(b) What are some limitations of BJTs (aka why do we even use MOSFETs). Consider from both an IC and SMD/PCB point of view.

7. Write a C program to generate a 16kHz PWM signal that has 40% duty cycle using Timer2 of an ATMega8 microcontroller.  

8. Consider a push button switch SW0 connected to pin INT0 external interrupts of an ATMega8 AVR. 8 LEDS are connected to port PB0-PB7 on the same AVR. These LEDS are connected such a lit LED displays that the output port is on logic level 1. On start-up, TASK1 is executed and continue indefinitely. If the push-button switch SW0 is pressed, TASK1 is paused and TASK2 is carried out after which TASK1 is resumed.

? TASK1- A roll action is performed using the LEDs: The first LED is lit and roll down to the last LED then back to the first LED. This operation is done indefinitely.

? TASK2- ALL the LEDs blink five (5) times.

Explain the operation of the safety (Light) Curtain?

1) Compare AM and FM modulation (advantages, disadvantages).

2) Why is the use of FM more preferred than PM? Explain your answer. (Hint: Compare the frequency deviations in both cases)

3) Give a short qualitative justification of the fact that FM has more noise immunity than AM.  

Part 1. Single-tone Modulation a –Write the code for an m-file (script) to generate a single tone FM signal. The modulating (message) signal is a single tone signal with frequency 1kHz and the carrier frequency is 20kHz. Vary the modulation index as m=0.2; 0.5; 1; 5 and 10. Plot your original message signal and the modulated signal for each value of m. Discuss the results. Use cosine function to define the message signal.

b- Repeat the part above only that this time generate a single tone PM signal. Compare the plots in parts a and b.

CHAPTER 7 Problem 4  Programmable Logic Controllers

Study the ladder logic program in Figure 7-41 and answer the questions that follow:

a. What type of timer has been programmed?

b. What is the length of the time-delay period?

c. What is the value of the accumulated time when power is first applied?

d. When does the timer start timing?

e. When does the timer stop timing and reset itself?

f. When input LS1 is first closed, which rungs are true and which are false?

g. When input LS1 is first closed, state the status (on or off) of each output.

h. When the timer’s accumulated value equals the preset value, which rungs are true and which are false?

i. When the timer’s accumulated value equals the preset value, state the status (on or off) of each output.

j. Suppose that rung 1 is true for 5 s and then power is lost. What will the accumulated value of the counter be when power is restored?

Figure 7-41 Ladder logic program for Problem.

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