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What is the compensation element used for variation in VBE and ICO?

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What is the compensation element used for variation in VBE and ICO?

(a) diodes

(b) capacitors

(c) resistors

(d) transformers

This question was addressed to me in an interview.

This interesting question is from Bias Compensation in division Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

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The correct answer is (a) diodes

For explanation I would say: A diode is used as the compensation element used variation in VBE and ICO. The diode used is of the same material and type as that of transistor. Hence, the voltage across the diode has same temperature coefficient as VBE of the transistor.

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