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If β = 100, what should be the ratio of the collector to base resistance for achieving insensitivity to β?

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If β = 100, what should be the ratio of the collector to base resistance for achieving insensitivity to β?

(a) 110

(b) 90

(c) 20

(d) 140

The question was posed to me in final exam.

This interesting question is from Collector Feedback Configuration in chapter Transistor Biasing and Low Frequencies of Analog Circuits

1 Answer

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Right answer is (d) 140

Easiest explanation: The Base resistance should be substantially lower than the Collector resistance by a factor of β. 110 is a good choice but provided 140 is present as an option, a better choice is a factor of 140.

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