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Electronics Handbook/Circuits/NPN Transistor Configurations/Amplifier with 2 Resistors
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Electronics Handbook
|
Circuits
|
NPN Transistor Configurations
Configuration
edit
Circuit without resistors R
1
, R
2
Analysis
edit
V
B
=
V
i
{\displaystyle V_{B}=V_{i}}
V
E
=
V
B
−
0.7
=
V
B
{\displaystyle V_{E}=V_{B}-0.7=V_{B}}
I
E
=
V
E
R
4
=
V
B
R
4
{\displaystyle I_{E}={\frac {V_{E}}{R_{4}}}={\frac {V_{B}}{R_{4}}}}
I
C
=
I
E
{\displaystyle I_{C}=I_{E}}
V
C
=
V
C
−
I
C
R
3
{\displaystyle V_{C}=V_{C}-I_{C}R_{3}}
V
C
=
V
i
(
1
−
R
3
R
4
)
{\displaystyle V_{C}=V_{i}(1-{\frac {R_{3}}{R_{4}}})}
