GATE EC 2026 Set 1 — Question 29
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Electronic Devices → BJT → Early Effect & Output Resistance
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Question
Figure shows the output characteristics of two different Bipolar Junction Transistors (BJT), BJT 1 with magnitude of Early voltage , and BJT 2 with magnitude of Early voltage . Which of the following options is/are correct regarding the Early voltages?
Correct answer
(C) V_(A1) < V_(A2); (D) V_(A2) is finite
Solution
The Early voltage is related to the slope of the output characteristics in the active region. The output resistance is given by .
1.Slope Comparison: From the figure, the slope of BJT 1 is steeper than the slope of BJT 2. A steeper slope implies a lower output resistance , and consequently, a smaller magnitude of Early voltage .
2.Conclusion on Magnitudes: Since BJT 2 has a flatter characteristic, . This makes option (C) correct.
3.Finiteness: Both curves have a non-zero slope, meaning neither Early voltage is infinite. Thus, is finite, making option (D) correct. Option (B) is incorrect as the slope for BJT 1 is clearly non-zero.
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