BJT Small-Signal Models
•
h
-parameter model
–
More complex
–
Better for ac operation
–
Common Emitter model
•
h
ie
= input impedance (
Ω
)
•
h
re
= reverse voltage
transfer ratio (unitless)
•
h
fe
= forward current
transfer ratio (unitless)
•
h
oe
= output admittance (S)
i
b
i
C
B
h
ie
h
fe
i
b
1/h
oe
h
re
V
ce
i
e
E