Question

The voltage gains of two amplifiers connected in series are 8 and 12.5. If the voltage of the input signal is 200 \(\mu V\), then the voltage of the output signal is

• A. 50 \(\mu V\)
• B. 20 \(\mu V\)
• C. 20 mV
• D. 50 mV

Hint:

Multiply gains of cascaded amplifiers to find overall voltage gain.

Answer 1

The Correct Option is C

Step 1: Calculate total gain
\[ A_{total} = 8 \times 12.5 = 100 \] Step 2: Calculate output voltage
\[ V_{out} = A_{total} \times V_{in} = 100 \times 200 \times 10^{-6} = 0.02 V = 20 mV \] Step 3: Conclusion
Output voltage is 20 mV.