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Analog Electronics Differential Amplifiers

In a BJT differential pair with an ideal tail current of 1 mA and zero differential input, the quiescent collector current of each matched transistor is approximately?

A0.25 mA
B0.5 mA
C1 mA
D2 mA

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Correct Answer: B. 0.5 mA

Explanation: With zero differential input, an ideal matched pair shares the 1 mA tail current equally, so each transistor carries about 0.5 mA.

Reference: Standard analog electronics: differential pair bias

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