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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-III EXAMINATION SUMMER 2017
Subject Code: X30902 Date:29/05/2017
Subject Name: Analog Digital Electronics
Time: 02:30 PM to 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

What is an op-amp? Explain how is op-amp used as voltage follower.
07

What are the specifications of ideal op-amp? Discuss the following parameters of op-amp Slew rate CMRR Virtual ground.
07
Q.2

Do as directed: (110.111)2 )10 (1001)8
(A6F.CD)16 (10011111)2 )16
07

State and prove De Morgan's theorem with examples.
07
OR

Simplify the Boolean function:
Express it in sum of minterms. Find the minimal sum of products using K-map.
07
Q.3

Simplify the following logic expressions using Boolean algebra:


07

Explain briefly the operation of 4 to 1 line multiplexer with diagram.
07
OR
Q.3

Explain TTL circuit in detail.
07

Explain full-adder with logic circuit and truth table.
07
Q.4

Draw the block diagram of IC 555 and explain its operation in detail.
07

What is a flip flop? Explain briefly S-R flip-flop with truth table.
07
OR
Q.4

Explain the Synchronous counter.
07

Explain the J-K flip-flop with logic diagram and truth table.
07
Q.5

Do as directed: Encode (2345)10 in BCD. Encode (1236)10 in excess-3 code. Find and complement of number 10100111.
07

Draw symbols and truth table for AND, OR, NOT gates. Prove that NAND and NOR gates are universal gates.
07
OR
Q.5

What is zero-crossing detector? Explain operation of zero-crossing detector with circuit.
07

Explain the operation of Schmitt trigger circuit.
07