question_answer 40)

  The amplifiers X, Y and Z are connected in series. If the voltage gains of X, Y and Z are 10,20 and 30, respectively and the input signal is 1 mV peak value, then what is the output signal voltage (peak value) (i) if dc supply voltage is 10 V ? (ii) if dc supply voltage is 5 V ?

Answer:

                    or (i) If d.c. supply voltage is 10 V, then output is 6 V since theoretical gain is equal to practical gain, i.e., output can never be greater than 6 V. (ii) If d.c. supply voltage is 5 V, i.e.,  = 5 V,  then output peak will not exceed 5 V. Hence,  v0 = 5 V.