GATE EE 2015 Set 2 — Question 22
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Analog & Digital Electronics → Amplifiers & Feedback → BJT & FET Biasing
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Question
In the following circuit, the transistor is in active mode and . To get , we replace with . Then the ratio is ______.
Correct answer
0.74 to 0.76
Solution
In active mode, the collector current is given by . The base current is determined by the base-emitter loop: . Since , , and remain unchanged when is replaced by , the base current and consequently the collector current remain constant.Case 1: With , .
Case 2: With , .
Taking the ratio:The answer is .
Case 2: With , .
Taking the ratio:The answer is .
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