1.

If an electronic system produces a 48mV output voltage when a 12mV signal is applied, calculate the decibel value of the systems output voltage gain.(a) 12dB(b) 6dB(c) 20dB(d) 4dBI had been asked this question during an interview.My question comes from General Frequency Consideration topic in chapter Transistor Biasing and Low Frequencies of Analog Circuits

Answer»

Correct CHOICE is (a) 12dB

Easy explanation: Gain of the system is = output VOLTAGE/input voltage

= 48/12 = 4

Gain in dB = 20 LOG(voltage gain)

= 20 log(4) = 12.04 dB.



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