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What is the purpose of diode in differential amplifier with constant current circuit?

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in Linear Integrated Circuits by (39.8k points)
What is the purpose of diode in differential amplifier with constant current circuit?

(a) Total current independent on temperature

(b) Diode is dependent of temperature

(c) Transistor is depend on temperature

(d) None of the mentioned

I got this question in an interview for internship.

The question is from Operational Amplifier Internal Circuit topic in portion Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
The accurate option is (a) Total current independent on temperature

Unravel the mysteries with: The base emitter voltage of transistor (VBE) in constant current circuit by 2.5mv/^oc, thus diode also has same temperature. Hence two variations cancel each other and total current IQ become in depend of temperature.

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