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Question
Define the terms : Input resistance How are these determined using typical input and output characteristics?
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Solution
Input resistance may be defined as the ratio of small change in the base-emitter voltage (ΔVBE) to the resulting change in base current (IB) at constant collector-emitter voltage (VCE).
Input resistance, `R_i=(DeltaV_(BE))/(DeltaI_B)`
To find the input resistance, mark a point P on the input characteristic. Now, draw a tangent at point P. The reciprocal of slope of AB will give the input resistance
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