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The expression for IC in the compensation for instability due to ICO variation_________

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The expression for IC in the compensation for instability due to ICO variation_________

(a) βI+βIO+βICO

(b) βI+βIO

(c) βIO+βICO

(d) βI+βICO

This question was addressed to me during an interview.

My query is from Bias Compensation in section Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

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The correct answer is (a) βI+βIO+βICO

To explain I would say: In this method, diode is used for the compensation in variation of ICO. The diode used is of the same material and type as that of transistor. Hence, the reverse saturation current IO of the diode will increase with temperature at the same rate as the transistor collector saturation current ICO.

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