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What is the ON resistance of a transistor?(a) RON = VCEsat/βIB(b) RON = VCEsat + VA/ICsat(c) RON = VCEsat/(β+1)IB(d) RON = VCEsat/ICsatThe question was asked at a job interview.The origin of the question is Transistor Switching Network topic in section Transistor Biasing and Low Frequencies of Analog Circuits

Answer» RIGHT choice is (d) RON = VCEsat/ICsat

Explanation: In the saturation region, we consider that the transistor acts as an ON switch. In this region, both collector-to-emitter voltage as WELL current are CONSTANT and do not change. The ON resistance is the RATIO of this saturation voltage to saturation current.


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