Electronic Devices - BJT and FET Frequency Response - Discussion
Discussion Forum : BJT and FET Frequency Response - General Questions (Q.No. 9)
9.
An amplifier rated at 30-W output is connected to a 5-
speaker. Calculate the input power required for full power output if the power gain is 20 dB.
speaker. Calculate the input power required for full power output if the power gain is 20 dB.Discussion:
2 comments Page 1 of 1.
Sanjay said:
9 years ago
For voltage gain = 20 LOG(RATIO).
FOR POWER GAIN = 10 LOG RATIO.
FOR POWER GAIN = 10 LOG RATIO.
(1)
Mae said:
6 years ago
Adb=10logAp.
where:
Adb=20 db.
let Ap=x.
20=10log(x).
*Shift solve.
x=Ap=100.
Ap=Po/Pi.
Where:
Ap=100
Po=30 W
Let Pi=x.
100 = 30/x
*Shift solve.
x=Pi=0.3 W or 300 mW.
where:
Adb=20 db.
let Ap=x.
20=10log(x).
*Shift solve.
x=Ap=100.
Ap=Po/Pi.
Where:
Ap=100
Po=30 W
Let Pi=x.
100 = 30/x
*Shift solve.
x=Pi=0.3 W or 300 mW.
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