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| 1. |
In a silicon transistor, the base current is changed by 20 change of 0.02 V in base to emitter voltage and a change of 2 mA in the collector current (i) Find the input resistance beta_(ac) and transconductance of the transistor (ii) if this transistor is used as an- amplifier. Find the voltage gain of the- amplifier with theload resistance 5 k amplifier |
| Answer» Solution :(i) `r_(i)=(Delta V_(BE))/(Delta I_(B) )=(0.02)/(20xx10^(-6)) = 1k Omega`, `beta_(ac)=(Delta I_(C))/(Delta I_(B) )= (2xx10^(-3))/(20xx10^(-6))=100` (II) Voltage gain, `A_(V) =-g_(m)R_(L)=-(0.1)(5XX10^(3))=-500`.(since, `g_(m)=(beta _(ac))/(r_(i)))` | |