7/23/2019 Tutorial 3 semiconductor.pptx

1/24

ME2143:Sensors and Actuators

Tutorial 3:Semiconductor Electronics

Department of Mechanical EngineerinFaculty of Engineerin

7/23/2019 Tutorial 3 semiconductor.pptx

2/24

Some brief revision again

7/23/2019 Tutorial 3 semiconductor.pptx

3/24

Diodes

7/23/2019 Tutorial 3 semiconductor.pptx

4/24

Diodes

Characteristic Graph of a Diode

7/23/2019 Tutorial 3 semiconductor.pptx

5/24

Diodes: Procedure

1. Assume conduction states of all diodes

Short circuit for ON Open circuit for OFF

2. Analyze circuit For ONdiode, check Currentacross For OFFdiode, check Voltaeacross

!. Check for "iolations. #epeat step 1 $y assumin different states of diodes

if assumptions are "iolated. Currentshould $e % & for ONdiode. Voltaeshould $e ' & for OFFdiode.

7/23/2019 Tutorial 3 semiconductor.pptx

6/24

Zener Diode

7/23/2019 Tutorial 3 semiconductor.pptx

7/24

Zener Diode

Select appropriate valuesConsidering power rating

7/23/2019 Tutorial 3 semiconductor.pptx

8/24

Transistors

(Collector)

(Emitter)

(Base)

(ain Functions

1. Amplification2. S)itchin ON or OFF

Common Characteristics

1. Acti"e state *+$% & and VC% VC*SA-

+c/ +$hF

2. Saturation state *+$% & and VC0 VC*SA-

+c' +$hF

!. Cutoff state *+$/ & +c/ &

Note +$% & )hen Vappro3/ &.4V

+/ +$5 +C

7/23/2019 Tutorial 3 semiconductor.pptx

9/24

Tutorial 3:

Semiconductor Electronics

7/23/2019 Tutorial 3 semiconductor.pptx

10/24

Question 1

7/23/2019 Tutorial 3 semiconductor.pptx

11/24

Question 1a)

Assume 6iode ON *Short Circuit

Check if Current +6% &

*Current 6i"ide

7/23/2019 Tutorial 3 semiconductor.pptx

12/24

Question 1b)

Assume 6iode ON *Short Circuit

Check if Current +6% &

Voltage

7/23/2019 Tutorial 3 semiconductor.pptx

13/24

Question 2

0V

+10V

+10V

-10V

0V

10mA

10m

A

10m

A

20m

A

20m

A

30mA

30mA

Assumtion!ig"t

v # 20Vi # 20mA

7/23/2019 Tutorial 3 semiconductor.pptx

14/24

Question 3

7/23/2019 Tutorial 3 semiconductor.pptx

15/24

Question 3a)

*6iode ON

*6iode OFF

7/23/2019 Tutorial 3 semiconductor.pptx

16/24

Question 3a)

*6iode ON

*6iode OFF

7/23/2019 Tutorial 3 semiconductor.pptx

17/24

Question 3b)

*6iode ON

*6iode OFF

7/23/2019 Tutorial 3 semiconductor.pptx

18/24

Question 4

i

is

Appl!ing "C#$ is# i %

i&

is

7/23/2019 Tutorial 3 semiconductor.pptx

19/24

Question 4

$ener %iode

!esistor

7/23/2019 Tutorial 3 semiconductor.pptx

20/24

Question 5

7/23/2019 Tutorial 3 semiconductor.pptx

21/24

Question 5

V&E'SAT(# 0)2 V

V*E # 0) V

0 V

V,E%# 2 V

V

VE

7/23/2019 Tutorial 3 semiconductor.pptx

22/24

Question 6

7/23/2019 Tutorial 3 semiconductor.pptx

23/24

Question 6

7/23/2019 Tutorial 3 semiconductor.pptx

24/24

Question 6