Question
The input resistance of a silicon transistor is . Its basecurrent is changed by which results in a change of 2 mA in the collectorcurrent. The transistor is used as a commonemitter amplifier with a load resistance of . What is the voltage gain of the amplifier? Also calculate the transconductance of the transistor.




None of these
medium
Solution
The alternating current gain of a commonemitter is defined by
are the changes in collectorcurrent and basecurrent respectively. Thus
= 133.3
Now, the ac voltage gain of a commonemitter amplifier is given by
.
= 1000.
Now, the transconductance of the transistor is defined as
,
is change in basetoemitter voltage. Further, the input resistance is given by
From the last two equations, we have
.
SIMILAR QUESTIONS
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Find the voltage gain and power gain in a transistor amplifier in commonemitter configuration when and the input and the output ersistance are .
A change of 0.2 mA in basecurrent causes a change of 5 mA in the collectorcurrent for a commonemitter amplifier. Find the ac current gain of the transistor.