BJT Small-Signal Models
h-parameter model
More complex
Better for ac operation
Common Emitter model
hie = input impedance (Ω)
hre = reverse voltage
transfer ratio (unitless)
hfe = forward current
transfer ratio (unitless)
hoe = output admittance (S)
ib
iC
B
hie
hfeib
1/hoe
hreVce
ie
E