1.

In a single state transistor amplifier, when by 10muA and collector current by 1mA. If collector load R_(C )=2kOmega and R_(L)=10kOmega, Calculate : (i) Current Gain (ii) Input impedance, (iii) Effective ac load, (iv) Voltage gain and (v) Power gain.

Answer»

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Solution :(i) Current Gain `beta=(Deltai_(c))/(Deltai_(b))beta=(Deltai_(c))/(Deltai_(b))=(1mA)/(10muA)=100`
(ii) INPUT impedance
`R_(i)=(DeltaV_("BE"))/(Deltai_(b))=(0.02)/(10muA)=2000Omega=2kOmega`
(iii) Effective (a.c) LOAD `R_(AC)==R_(C)||R_(L))`
`therefore R_(AC)=(2xx10)/(2+10)=1.66kOmega`
(iv) Voltage gain, `A_(v)=betaxx(R_(AC))/(R_("in"))=(100xx1.66)/(2)=83`
(v) `"Power gain, "A_(p)="Current gain"xx"Voltage gain"`
`=100xx83=8300`


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