JEE Main201815 Apr 2018Morning ShiftPhysicsSemiconductorsActual
In a common emitter configuration with suitable bias, it is given than R _ L is the load resistance and R_ B E is small signal dynamic resistance (input side). Then, voltage gain, current gain and power gain are given, respectively, by: [ is current gain, I_B, I_C, I_E are respectively base, collector and emitter currents]
Options
- AR_L R_ B E , I_E I_B , ^2 R_L R_ B E
- B^2 R_L R_ B E , I_C I_B , R_L R_ B E
- C^2 R_L R_ B E , I_C I_E , ^2 R_L R_ B E
- DR_L R_ B E , I_C I_B , ^2 R_L R_ B E
Correct answer
D. R_L R_ B E , I_C I_B , ^2 R_L R_ B E
Step-by-step solution
Current gain = I_C I_B Voltage gain A _ v = Current gain Resistance gain = R_L R_ B E Power gain A_p=( Current gain )^2 Resistance gain = ^2 R_L R_ B E