An amplifier has an input resistance of 20kΩ and output resistance of 15Ω. The open circuit gain of the amplifier is 25dB and it has a resistive load of 135Ω. The amplifier is supplied from an ac signal source of internal resistance of 5kΩ and r.m.s. amplitude 15dB above a reference level of 1µV.
(a) Draw the equivalent circuit of this arrangement of source, amplifier and load.
(b) Calculate:
(i) the voltage at the input terminals to the amplifier
(ii)the voltage across the load
(iii) the power gain in dB
(a) Draw the equivalent circuit of this arrangement of source, amplifier and load.
(b) Calculate:
(i) the voltage at the input terminals to the amplifier
(ii)the voltage across the load
(iii) the power gain in dB
