Answer to Question #252208 in Electrical Engineering for Natalie

Question

QUESTION 9

A three- stage amplifier circuit has first stage gain of 45dB, second stage gain of 50dB and 

third stage gain of -5dB. What is the overall gain? If input to the first stage is 0.1mV, what is 

the output of the final stage?

Answer 1

Overall gain is

$=45+50-5=90dB\\ 10\log{\frac{V_o}{V_i}}=90\\ V_i=0.1mV\\ V_o=10^9\times0.1mV=10^8mV$