Question

# Draw the typical input and output characteristic of an n−p−n transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance (ri), and (b) current amplification factor (β).

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Solution

## (a) The input resistance of the transistor is defined as the ratio of small change in base - emitter voltage to the corresponding change in base current at a given VCE.∴ Input impedance, ri=(ΔVBEΔIB)VCEThe input impedance of the transistor in CE mode is very high.(b) The current amplification factor or current gain is defined as the ratio of a small change in the collector current to the corresponding change in the base current at a constant VCE.Current gain, β=(ΔICΔIB)VCE

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