1.

If source resistance in an amplifier circuit is zero, then voltage gain (output to input voltage ratio) and source voltage gain (output to source voltage ratio) are the same.(a) True(b) FalseI had been asked this question during an interview.Question is from Hybrid Equivalent Model topic in division Transistor Biasing and Low Frequencies of Analog Circuits

Answer»

Correct option is (a) True

Easy explanation: When a source resistance RS is present, the VOLTAGE GAIN with respect to source becomes

AVS = AVRI’/(RS+RI’), where AV is voltage gain with respect to transistor input. HOWEVER when RS=0 then AVS = AV.



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