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What is the stability factor against VBE for the collector feedback configuration?(a) β/(Rc * (1 + β))(b) -β/(RB + Rc * (1 + β))(c) β/(RB + Rc * (1 + β))(d) -β/(Rc * (1 + β))I have been asked this question during an online interview.My question is from Collector Feedback Configuration in section Transistor Biasing and Low Frequencies of Analog Circuits

Answer»

The correct option is (c) β/(RB + Rc * (1 + β))

To EXPLAIN: This is easily derived from the COLLECTOR feedback configuration by using the METHOD of K.V.L. deriving a relation between the collector current and the base emitter voltage. It should be noted that the stability against VBE INCREASES in comparison to the base bias comparison.



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