Another kind of transistor is the BJT. BJTs are analogous to MOSFETs in many ways: 1.They have three terminals 2.They have three operating modes 3.Type come in two types 4.They are made with n-type and p-type Silicon.

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CHAPTER 5


BIPOLAR JUNCTION TRANSISTORS

(BJT)


Another kind of transistor is the BJT.


BJTs are analogous to MOSFETs in
many

ways:

1.

They have three terminals

2.

They have three operating modes

3.

Type come in two types

4.

They are made with
n
-
type and
p
-
type Silico
n.



5.1 Device structure and Physical Operation


There are two types of BJTs


npn

and
pnp


(analogous
to NMOS and PMOS).


A BJT is a “Silicon Sandwich”


one type of Si
sandwiched between two layers of the other.




The result is
two

p
-
n

junctions !