Question

the amplifiers X,Y,Z are connected in series . if the voltage gains of X,Y, Z are 10, 20, and 30 respectively and the input signal is 1mV peak value , then what is the output signal voltage ( peak value) . if dc supply voltage is 10 V .

ans : 6V

how?

Answer 1

$\begin{array}{l}\text{In cascaded amplifiers the gains get multiplied}\text{.}\\ \text{So, the final gain will be}\\ \text{10}\times \text{20}\times \text{30 = 6000}\\ {\text{V}}_{\text{in}}={10}^{-3}\text{volt}\\ \text{Thus,}\\ \frac{V_{\text{out}}}{V_{\text{in}}}=6000\\ =>V_{\text{out}}=6000\times V_{\text{in}}\\ =>V_{\text{out}}=6000\times {10}^{-3}=6\\ =>V_{\text{out}}=6\text{volt}\end{array}$