Draw the equivalent circuit for a common-emitter


Draw the equivalent circuit for a common-emitter bipolar transistor amplifier and
derive suitable formulae for the amplifier current gain, voltage gain and power gain. Neglect bias, decoupling and coupling components. 2. An amplifier has the following parameters: input resistance, 470 kO; output
resistance, 8.2 kO; opencircuit voltage gain 50. A signal source having an e.m.f. of 75
µV and negligible internal resistance is connected to the input of the amplifier. The
output is connected to a 10 kO resistive load. Draw the equivalent circuit and hence
determine: (a) the output voltage developed across the load; (b) the current gain (c)
the voltage gain.

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