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How do we compute the input resistance of a simplified CC amplifier model using hybrid parameters?(a) hie – (1 + hfe) × RL(b) hie + (1 + hfe) × RL(c) hie – (1 + hfe) / RL(d) hie + (1 + hfe) / RLThe question was asked in a national level competition.The question is from Simplified Calculations for the CC Configuration in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

The correct choice is (b) hie + (1 + hfe) × RL

Explanation: The INPUT RESISTANCE of a simplified common collector (CC) amplifier can be expressed in terms of approximate HYBRID parameters. The input resistance is hie + (1 + hfe) × RLwhere, hie and hfe are the input resistance and CURRENT gain of CE amplifier respectively and RLis the load resistance.



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