menu search
person
What is a BJT?
thumb_up_alt 0 like thumb_down_alt 0 dislike
709 views

Please log in or register to answer this question.

2 Answers

BJT is a bipolar junction transistor. BJT have three terminal. Base, emitter and collector are the three terminals of BJT. BJT is a current controlled device. NPN and PNP are the two types of BJT.
thumb_up_alt 0 like thumb_down_alt 0 dislike

Bipolar Junction Transistor (BJT):

image image image image
BJT is a Bipolar device. (Uses both electrons and holes charge carrier for current conduction)
Two Junctions (Emitter junction & collector junction)
Transfer-Resistor (Transistor) (Amplify by transferring signal from lower resistance to higher resistance region)
BJT is minority carrier device.
Three terminal device
Emitter (More doped) (Smaller area)
Base (Thin & lightly doped)
Collector (Less doped)(Larger area)
Two type semiconductor
N-type and P-type
N-type (Electrons are carrier)
P-type (Holes are carrier)
NPN and PNP
Basic function is to amplify current
Use as amplifiers and switches
BJT is a current controlled device.
The input impedance of BJT is low.
Small base current.
Emitter (Emits electrons)
Collector (Collects electrons)
Current gain β = Ic/Ib
The drive circuit of BJT is complex.
Switching speed of BJT is in the range of microseconds means slow switching speed.
BJT is the negative temperature coefficient device.
Conduction losses are low.
Switching losses are high for high frequency.
Applications: computer, mobile phones, audio amplifiers, radio etc.
Active mode (Current amplification)
Cutoff mode (Open switch)
Saturation mode (Close switch)
thumb_up_alt 0 like thumb_down_alt 0 dislike
← Prev Question Next Question →

Related questions

thumb_up_alt 0 like thumb_down_alt 0 dislike
52 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
2.5k views 2 answers
Last answer: Bipolar junction transistor
thumb_up_alt 1 like thumb_down_alt 0 dislike
75 views 1 answer
thumb_up_alt 1 like thumb_down_alt 0 dislike
68 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
155 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
2.6k views 1 answer
thumb_up_alt 3 like thumb_down_alt 0 dislike
121 views 4 answers
thumb_up_alt 1 like thumb_down_alt 0 dislike
82 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
92 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
75 views 0 answers
thumb_up_alt 0 like thumb_down_alt 0 dislike
60 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
92 views 2 answers
thumb_up_alt 0 like thumb_down_alt 0 dislike
79 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
89 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
518 views 0 answers
thumb_up_alt 1 like thumb_down_alt 0 dislike
83 views 1 answer
thumb_up_alt 1 like thumb_down_alt 0 dislike
110 views 1 answer
thumb_up_alt 1 like thumb_down_alt 0 dislike
108 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
66 views 0 answers
thumb_up_alt 0 like thumb_down_alt 0 dislike
227 views 1 answer
Install Now
...