(1) (TCO 6) An amplifier has a power gain of 3dB and an input signal power P(In)
ID: 1814897 • Letter: #
Question
(1) (TCO 6) An amplifier has a power gain of 3dB and an input signal power P(In) = 100mW. What is the output power level?
200mW
200W
1W
100mW
(2) (TCO 6) A tank circuit coil is operating at a resonance frequency f(res) = 20 MHZ; The circuit must operate with a bandwith of 200 KHZ. What is the quality factor, Q, for the coil?
150
100
200
50
(3) (TCO 6) An amplfier has an input signal power P(In) = 500 microfaradW. The output power P(out) = 200mW. What is the gain in dB for the amplifier at that frequency?
+26
-23
-13
+33
Explanation / Answer
1) 200 mwatt
2) Q=(B.W.)/(fres)=(20000kHz/200kHz)=100
3) gain=P(out)/P(n)=(200*10^3 uw)/500uw=400
in dB
10 log (gain)=10 log (400)=26 dB
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