Question

The trans-conductance of a common
emitter transistor used as an amplifier is
0.05 siemens. If the input resistance of
the amplifier is 1 k the current gain of
the amplifier is
(A) 5
(B) 50
(C) 500
(D) 0.02​

Answer 1

Answer:

A designer wants to design a bipolar amplifier with a transconductance gm of 30 mA/V and a base input resistance

Answer 2

Given :

The trans conductance of the common emitter transistor = 0.05 siemens

The input resistance of the amplifier = 1000 ohm

To find :

The current gain of the amplifier .

Solution :

Trans conductance = current gain / input resistance

=> Current gain = trans conductance * input resistance

                     = 0.05 * 1000

                     = 50

The current gain of the amplifier is 50 ( option b ) .