An n – p – n transistor is used in common emitter configuration with an amplifier with $$1k$$Ω load resistance. Signal voltage of $$10$$ mV is applied across the base – emitter. This produces a $$3mA$$ change in the collector current and $$15$$μA change in the base current of the amplifier. The input resistance and voltage gain are

Question

An n – p – n transistor is used in common emitter configuration with an amplifier with $$1k$$Ω  load resistance. Signal voltage of $$10$$ mV is applied across the base – emitter. This produces a $$3mA$$ change in the collector current and $$15$$μA  change in the base current of the amplifier. The input resistance and voltage gain are

Infinity Learn · Accepted Answer

∴Voltage gain $$=VoutputVinput$$                                                           $$=Rl$$×△IcVin                              $$=1$$×$$103$$×$$3$$×$$10$$−$$310$$×$$10$$−$$3=300Input$$ Resistance : $$Rin=Viniin=Vinib=10$$×$$10$$−$$315$$×$$10$$−$$6$$                                                                $$=10$$×$$10315=0.67$$×$$103$$Ω $$=0.67k$$Ω

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