Name: Sonal varshney
S.no: 53
Faulty no: 18ELB458
Assignment questions:-
Q1. The main advantage of TTL totem-pole as compared to other TTL types are:
a.
b.
c.
d.
Higher fan in and fan out
Fast switching and low power dissipation.
Low cost
Low noise margin
Q2. The logic level of ECL can be taken as
a.
b.
c.
d.
Logic 0 as 0V and logic 1 as 1V
Logic 0 as -2.5V and logic 1 as 5V
Logic 0 as -1.75V and logic -0.8V
None of above
Q3. The noise immunity _________ with noise margin .
a.
b.
c.
d.
Increases
Decreases
Have no effect
None of above
Q4. A certain gate has power dissipation of 10.75 uW and has Icch equals to 1.5 uA and Iccl
Equals to 2.8 uA. Determine the Vcc and power dissipation with 90% duty cycle.
a.
b.
c.
d.
8V and 9.0 uW
5V and 9.125 uW
5V and 9.75 uW
None of above
Answers:Q1.
Ans. b
Q2.
Ans. C
Q3.
Ans. A
Explanation: noise immunity is directly proportional to noise margin.
Q4.
Ans. D
Explanation: pd= icc(avg)* Vcc
Icc(avg)=(icch+Iccl)/2 =2.15uA
So Vcc=5V
Pd with 90%duty cycle
Pd= 0.9(5*1.5)+0.1(5*2.8)=8.15uW.