Question

At the input an amplifer has a signal voltage level of $3\mu V$ and a noise voltage level of $1\mu V.$ What is the signal to noise ratio at the input?

• A. 3
• B. 9
• C. 1/3
• D. 1/9

Answer 1

The correct option is B 9

Signal to noise ratio at the input

$={\left(\frac{3\times {10}^{-6}}{1\times {10}^{-6}}\right)}^2=9$