Question

An amplifier with a gain of 60 dB has 1 uV of voltage applied to the input. The output voltage is______mV.

A. 10

b. 100

c. 1000

d. 60

Please state your work clearly and if it's handwritten, please write clearly so that I am able to clearly read the information. Thanks!!

Answer 1

Gain in dB=60dB

NOTE-> ALL CALCULATION OF LOG AND ANTILOG IS DONE WITH BASE 10 .

av= 20*log(Av) av= gain in dB

av=60dB

Av=?

60=20*Log (Av)

3=Log (Av)

Taking antilog on both side

Antilog(3)= Av

1000= Av

Voltage Gain(Av) = output voltage /input voltage

1000= output voltage/ input voltage

1000*input voltage = output voltage

Input voltage =1uV (micro volt)=10^-6V=1/1,000,000V

1000*1/1,000,000= Output Voltage

1/1000 V = output voltage

10^-3 Volt = output voltage

1mV = output voltage or 1000uV