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What will be the emitter current in a differential amplifier, where both the transistor are biased and matched? (Assume current to be IQ)

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in Linear Integrated Circuits by (39.8k points)
What will be the emitter current in a differential amplifier, where both the transistor are biased and matched? (Assume current to be IQ)

(a) IE = IQ/2

(b) IE = IQ

(c) IE = (IQ)^2/2

(d) IE = (IQ)^2

The question was posed to me in unit test.

Question is taken from Operational Amplifier Internal Circuit topic in portion Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Correct choice is (a) IE = IQ/2

Dive into clarity with: Due to symmetry of differential amplifier circuit, current IQ divides equally through both transistors.

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