1.

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 volt, calculate the output ac signal.

Answer»

1 V
2 V
3 V
4 V

Solution :Here , `A_(v_1) = 10 and A_(v_2) = 20 `
`:.` Net voltage gain `A_v = A_(v_1)xxA_(v_2) = 10xx20=200`
Now using `A_v = (V_o)/V_i`
`:. V_o=A_v.V_i=0.01 xx200=2V`


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