Q.
In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 rnho and current gain 20, the voltage gain will be
see full answer
Want to Fund your own JEE / NEET / Foundation preparation ??
Take the SCORE scholarship exam from home and compete for scholarships worth ₹1 crore!*
An Intiative by Sri Chaitanya
a
13G
b
54G
c
23G
d
1.5G
answer is C.
(Unlock A.I Detailed Solution for FREE)
Ready to Test Your Skills?
Check your Performance Today with our Free Mock Test used by Toppers!
Take Free Test
Detailed Solution
Voltage gain= Current gain × Resistance gainAυ=β×RoutRin Transconductance, gm=βRin or Rin=βgm ∴ Aυ=gm Rout For first case, Aυ=G, gm=0.03mho, β=25 ∴ G=0.03Rout −−−(i) For second case, Aυ=G', gm=0.02mho,β=20 ∴ G'=0.02Rout −−−(ii) Divide (ii) by (i), we get G'G=23 or G'=23G
Watch 3-min video & get full concept clarity