Hybrid Model (h parameter equivalent ckt) of BJT

Common Emitter (CE) configuration

vBE = f1 (iB, vcE)  -----------(1)

ic = f2 (iB, vcE)  -----------(2)

ByTaylor’s seriesexpansion of equn (1) and (2) around Q point & neglecting higher order terms we get.

vBE = VBE + vbe

By comparing (3) or (5)

hie = short circuit input impedance (Ω)

hre = open circuit reverse voltage transfer ratio (gain).

(Question)Find CC h- parameters in terms of CE h-parameter?

hic = hie

hfe = -(1+hfe)

hrc = 1-hre = h

hoc = hoe

ib = 0

vBE = f1 (iB,  vcE)  --------------(1)

ic = f2 (iB,  vcE)  -----------------(2)

hfe = short circuit forward  transfer current ratio (dimensionless)

vbe = hieib + hrevce---------------(5)

ic = hfeib + hoevce  -----------------(6)

Small signal low frequency

h – parameter equivalent ckt.


 

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