Determine Ri, Ro, Av and gm for amplifier circuit shown in figure VBE(ON)=0.7V, β=100, VA=∞

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written 3.9 years ago by

teamques10 ★ 69k

Solution: It is a common base configuration. Substitute the approximate hybrid equation model

$Input \ Resistance =\left(hib \ H_2+\dfrac{600}{1000}\Omega\right)\\ hib=\dfrac{hie}{1+hfe}=(\textrm{Value of hie is not given hfe=100})\\ Output \ resistance =\left(\dfrac1{hob}||2.7||1k\right)$

(hob is not given)

$\textrm{Voltain gain } A_V=\dfrac{-hfeR_L'}{hie}\\ gm=\left(\dfrac B{r\pi}\right)=\left(\dfrac B{hie}\right)=\left(\dfrac{100}{hie}\right)$

Alternate way: (Hybrid-π-Model)

gm=(IC/VT)

To determine IC, DC eq. …

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