The first stage of a two-stage amplifier has a voltage gain of 10, a 600 Q input noise resistance and a 27 kN output resistor. For the 2nd stage, these values are 25, 10 kN, 81 kQ, and 1 MQ respectively. Calculate the equivalent input noise resistance of this two- stage amplifier. Also determine the noise voltage when the bandwidth is 4 MHz at 27 °C. ANS. RT = 3099 N, VnT = 14. 33 uV

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BJT (Bipolar Junction Transistor)

A BJT is a semiconductor device with 3 terminals that consist of a p-n junction diode that can amplify the signal or current. It is a current-controlled device. The three BJT terminals are base, collector, and emitter. The BJT works with the charge carrier, the two type of carriers in the BJT are holes and electrons, the charge carriers flow by the process of recombination. The signal to be amplifier is generally given as the input at the base terminal and an amplified form of it is available at the collector terminal.