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A transistor is being used as a common emitter amplifier . a What is the phase relationship between the output and input voltages ? b. Define voltage gain of an amplifier. c. Define the transconductance of a transistor . |
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Answer» Solution :a. A PHASE CHANGE `pi` is introduced between the input and output signal . b. Voltage gain , `A_(V)` of a transistor amplifier is the RATIO of O/P voltage `(V_(o))` to I/P voltage `(V_(i))`. `A_(V) = (V_(o))/(V_(i)) = (- Delta I_(C). R_(L))/(Delta V_(BE)) = beta ((R_(o))/(R_(i)))` c. Transconductance , `g_(m)` is the ratio of change in collector current to the change in the base-emitter voltage . i.e, `g_(m) = (Delta L_(C))/(Delta V_(BE)) ""` Also , `g_m = (|A_(V)|)/(R_(L))` |
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