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How do we compute the input resistance of a simplified CB amplifier model using hybrid parameters?(a) hfe / 1 – hfe(b) hfe / 1 + hfe(c) hie / 1 – hfe(d) hie / 1 + hfeI got this question in semester exam.The query is from Simplified Calculations for the CB Configuration topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits |
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Answer» RIGHT option is (d) hie / 1 + HFE For explanation: The input resistance of a simplified common base (CB) amplifier can be expressed in TERMS of approximate hybrid parameters. The input resistance is hie / 1 + hfe where, hie and hfe are the input resistance and CURRENT gain of CE amplifier respectively. |
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