Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 V, calculate the output a.c. signal.

Solution

Given, two amplifiers are cascaded in series.

Voltage gain of first amplifier = 10
Voltage gain of second amplifier = 20
Input signal = 0.01 V

Therefore,
Total voltage gain, $A_{V} = \frac{∆ V_{0}}{∆ V_{i}} = {Av}_{1} \times {Av}_{2}$

$\Rightarrow$ $∆ V_{0} = ∆ V_{i} \times A_{V_{1}} \times A_{V_{2}}$

$= 0.01 \times 10 \times 20 = 2 V .$

is the output a.c. signal.

For Daily Free Study Material Join wiredfaculty