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CBSE Class 12-science Answered

dear experts 
is their any shortcut or tricks to do the diagrams of TRANSISTER IN CE configuration ..
the diagram is so complicated to understand ..
kindly explain its working also ?? 
Asked by mrinal456 | 18 Feb, 2016, 11:28: PM
answered-by-expert Expert Answer
While drawing the circuit  remember that in CE configuration, the emitter is common to both input and output terminals of amplifier circuit. Thus, the input circuit is connected between the base and emitter whereas, the amplified output signal is taken between collector and emitter (so that, emitter is common).

The small input voltage Vin is amplified by the transistor and the output voltage, Vo is obtained across emitter-collector of the transistor. In this configuration, when the input signal is positive going, the output is negative going and vice versa. Thus, the input and output signals are out of phase. Hence, the circuit is called as inverting amplifier.
Input circuit = Ib and Ic = output current
Current gain = Ic / Ib because Ic > Ib, so current gain is high
Input resistance = Vin / Ib as Ib is very small, input resistance is very high
Output resistance = Vo / Ic as Ic is very large, output resistance is very small
Hence voltage gain = Vo / Vin = (Ic X Rc) /(Ib X Rb)
Answered by Yashvanti Jain | 22 Feb, 2016, 01:38: PM

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