Find the db gain of an amplifier whose input voltage is 0.8 volts and whose output voltage is 20 volts.
A) $\quad 1.4 \mathrm { db }$
B) $\quad 27.96 \mathrm { db }$
C) $\quad 64.38 \mathrm { db }$
D) $\quad - 64.38 \mathrm { db }$
E) $\quad 3 \mathrm { db }$

Question

Find the db gain of an amplifier whose input voltage is 0.8 volts and whose output voltage is 20 volts. 
A) $\quad 1.4 \mathrm { db }$
B) $\quad 27.96 \mathrm { db }$
C) $\quad 64.38 \mathrm { db }$
D) $\quad - 64.38 \mathrm { db }$
E) $\quad 3 \mathrm { db }$

Quizplus · Accepted Answer

The formula to calculate db gain is:
db gain = 20 log (Vout/Vin)
Substituting the given values, we get:
db gain = 20 log (20/0.8)
db gain = 20 log (25)
db gain = 20*1.39794
db gain = 27.959
Hence, the db gain of the amplifier is 27.96 db, which is closest to option B.

Find the Db Gain of an Amplifier Whose Input Voltage 1.4db\quad 1.4 \mathrm { db }1.4db

Find the Db Gain of an Amplifier Whose Input Voltage $\quad 1.4 \mathrm { db }$