Find gain in db of an amplifier has 600 ohm input resistance, Computer Engineering

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An amplifier has an input resistance of 600 ohms and a resistive load of 75 ohms. When it has an rms input voltage of 100 mV, the rms output current is 20mA. Find the gain in dB.

Input power is P = (100 x 10) /600 W = 16.7 W

Output Power is P = (20 x 10) x 75 W = 30 m W

Gain is P/P = (30 x 10)/(16.67 x 10)

10 log 1.8 +10 log = 2.6 + 30 = 32.6 dB.


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