Digital Logic Design.pdf - FUUAST

Federal Urdu University of Arts, Science & Technology Islamabad – Pakistan

B.Sc. Electrical Engineering

DIGITAL LOGIC DESIGN

Prepared By:

Engr. Yousaf Khattak Lab Instructor FUUAST-Islamabad

Digital Logic Design (Pre Lab Home Work) 1



EXPERIMENT NO. 2

TO DEMONSTRATE DIODE LOGIC AND & OR GATE 1. What is the function of data switches?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. What is the function of pulse switches of Digital Training System (ETS-5000 & ETS-7000)?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 3. What is the function of Pulse generator?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 4. What is the difference between TTL (Transistor Transistor Logic) and DTL (Diode – Transistor Logic) and DL (Diode Logic)?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 5. Why we prefer TTL technology on other technologies?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ Digital Logic Design (Pre Lab Home Work) 2



6. Write about the forward and reverse bias operation of PN junction diode

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 7.

In forward bias the voltage drop across silicon diode will be

__________________

8.

In reverse bias the voltage drop across silicon diode is ___________________




EXPERIMENT NO. 3

VERIFICATION OF TRUTH TABLE OF AND, OR, NOT, NAND AND NOR LOGIC GATES 1. What is the AND Gate logic operation? Draw its truth table for all possible combinations of 2 inputs. Truth Table ___________________________________________________________

___________________________________________________________ ___________________________________________________________ ___________________________________________________________

2. What is the OR Gate logic operation? Draw its truth table for all possible combinations of 2 inputs. Truth Table

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________

3. What is the NOT Gate logic operation. Draw its truth table. Truth Table ___________________________________________________________

___________________________________________________________ ___________________________________________________________ ___________________________________________________________

4. In TTL logic the VCC applied to the IC will be________________




5. What is the NAND Gate logic operation? Draw its truth table for all possible combinations of 2 inputs? Truth Table ___________________________________________________________

___________________________________________________________ ___________________________________________________________ ___________________________________________________________

6. What is the NOR Gate logic operation. Draw its truth table for all possible combinations of 2 inputs? Truth Table ___________________________________________________________

___________________________________________________________ ___________________________________________________________ ___________________________________________________________

7. What are the two Universal gates? Draw the Gate level diagram of the following AND, OR, NOT Gates using universal gates only. AND

OR

NOT

AND

OR

NOT




EXPERIMENT NO. 4

IMPLEMENTATION OF BOOLEAN EXPRESSION USING LOGIC GATES AND VERIFICATION OF DEMORGAN’S THEOREM 1. Write the outputs of following Boolean expressions given in the table. S. No

Logic

1

x+0

2

x+x’

3

x+x

4

x+1

5

(x’)’

6

x.(y+z)

7

(x+y)’

8

x+x.y

9

x.1

10

x.x’

11

x.x

12

x.0

13

x+y.z

14

(x.y)’

15

x.(x+y)

Output




2. Simplify the following Boolean functions and draw their logic tables and circuit diagrams

a) F(x,y,z)= xy + x’z + yz b) F(x,y,z)= (x + y)(x’ + z) (y + z) c) F(w,x,y,z)= xy + x(wz + wz’)




3. Find the compliment of the Boolean functions a)

F(x,y,z)= (x’.y.z’ + x’.y’.z)’

b)

F(x,y,z)= [x.(y’.z’ + y.z)]’

c)

F(A, B, D)= [D.(A’ + B) + B’.D]’

4. Find the output of the following circuit

x y Z




EXPERIMENT NO. 5

IMPLEMENTATION OF 7 SEGMENT USING EXCESS-3 CODE AND IMPLEMENTATION OF GRAY CODE 1. What are BCD and Excess -3 codes?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. 7- Segment display has the following 7 inputs a, b, c, d, e, f, g. what will be the combinations of inputs for displaying hex digits? INPUT HEX Digit

OUTPUT g

f

e

d

c

b

a

0 1 2 3 4 5 6 7 8 9 A B C D E F




3. What is the significance of Gray code?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________




EXPERIMENT NO. 6 IMPLEMENTATION OF HALF ADDER & FULL ADDER

1. What is the basic difference between half adder and full adder?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. Write the operation of Half-Adder with the help of truth table and circuit diagram?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 3. Write the operation of Full-Adder with the help of truth table and circuit diagram?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 4. How can we implement full adder from two half adder?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________




EXPERIMENT NO. 7 DESIGN & IMPLEMENTATION OF A 2 X 4 DECODER 1. For n-input decoder what will be the number of outputs?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________

2. What is the function of enable pin in a decoder?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 3. Implement the given Boolean Function using 2x4 decoder and one OR gate only.

F(x,y)=x’y +xy’




EXPERIMENT NO. 8

DESIGN & IMPLEMENTATION OF A 4-TO-2 ENCODER 1. What is the operation of 4 x 2 Encoder?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________

2. Explain the working of 4 x 2 Encoder with the help of truth table?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________




EXPERIMENT NO. 9 DESIGN OF A 2X1 AND 4X1 MULTIPLEXER 1. What is the basic difference between multiplexer and Encoder?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. Derive and simplify (if possible) the Boolean function of 4x1 Mux?

3. Write the operation of 4x1 multiplexer?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ Digital Logic Design (Pre Lab Home Work) 14



EXPERIMENT NO. 10

IMPLEMENTATION OF FULL ADDER USING MUX

1. What is the function of select Lines in a MUX?

_____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________

2. How full-adder can be implemented by Multiplexer IC 74151?

_____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________




EXPERIMENT NO. 11

DESIGNING AND IMPLEMENTING DE-MULTIPLEXER 1. What is the basic difference between De-Multiplexer and Decoder?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. Derive and simplify (if possible) the Boolean function of 1x4 DE- MUX?

3. Write the operation of 1x4 multiplexer?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ Digital Logic Design (Pre Lab Home Work) 16



EXPERIMENT NO. 12 IMPLEMENTATION/DESIGN OF 1 BIT & 2 BIT MAGNITUDE COMPARATORS 1. Write the operation of 2-bit magnitude comparator?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. Derive the Boolean functions by using k-maps for enable section of two Bit Magnitude Comparator

a. E = A′1 A′0 B′1 B′0+ A′1 A0 B′1 B0+ A1 A0 B1 B0+ A1 A′0 B1 B′0 = (A0 + B0)'(A1 + B1)' b. G= A1B′1+ A′1 A0 B′1 B′0+ A1 A0 B1 B′0 = A1B'1 + A0B'0(A1 + B1)' c. L= A′1B1 + A′0 B0 (A′1B′1+ A1 B1) = A'1B1 + A'0B0 (A1 + B1)'




EXPERIMENT NO. 13 RS FLIP-FLOP 1. What is the difference between a Combinational Logic and Sequential Logic?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. What is the difference between a LATCH and Flip-Flop?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 3. Write the operation of RS Flip-Flop with the help of truth table and schematic diagram?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 4. What is the purpose of clock in RS Flip-Flop?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ Digital Logic Design (Pre Lab Home Work) 18



EXPERIMENT NO. 14 JK FLIP-FLOP 1. Write the operation of JK Flip-Flop with the help of truth table and schematic diagram?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. What are the demerits of JK Flip-Flop?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 3. Why we use Master-Slave JK Flip-Flop?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________




EXPERIMENT NO. 15

SHIFT REGISTER 1. What is Shift Register?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________

2. Why we use D Flip-Flop in shift registers?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 3. What are the different types of shift registers?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________




EXPERIMENT NO. 16 BINARY COUNTER 1. How a 4-bit binary counter works?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 2. Write the operation of asynchronous decimal (BCD) counter?

___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________
