Region
|
Emitter base junction
|
Collector-base junction
|
function
|
Active
|
Forward biased
|
Reverse biased
|
Amplifier
|
Cut-off
|
Reverse biased
|
Reverse biased
|
Off-switch
|
saturation
|
Forward biased
|
Forward biased
|
On-switch
|
Showing posts with label electronics library. Show all posts
Showing posts with label electronics library. Show all posts
Sunday, March 1, 2015
what are the biasing conditions for a transistor to act as an amplifier?
Saturday, February 28, 2015
Comparison between zener breakdown and avalanche breakdown
S.NO
|
Zener breakdown
|
Avalanche breakdown
|
1.
|
Breakdown is due to strong electric field developed
across the narrow depletion region.
|
Breakdown is due to charge multiplication
|
2.
|
Observed if Vz > 6 volt
|
Observed if Vz < 6 volt
|
3.
|
The VI characteristics is very sharp with zener
breakdown
|
The VI characteristics is not very sharp with
avalanche effect
|
4.
|
The breakdown voltage decreases as junction
temperature increases
|
The breakdown voltage increases as junction
temperature increases
|
5.
|
It occurs in heavly doped diodes
|
It occurs in normally doped diodes
|
Sunday, February 22, 2015
Comparison of PN junction diode and zener diode
Comparison of PN junction diode and zener diode
s.no
|
PN
junction diode
|
zener
diode
|
1
|
Symbol
 |
Symbol
 |
2.
|
Operated in forward biased condition
and never operated in reverse biased condition
|
Operated in reverse breakdown region
|
3
|
Characteristics lies in 1st quadrant
|
Characteristics lies in 3rd quadrant
|
4
|
Applications:
Rectifiers, clippers, clampers, voltage
multipliers
|
Applications:
Regulator, zener limiters
|
5
|
Low power dissipation capability
|
High power dissipation capability
|
