Question:
For a fixed bias circuit the stability factor is
For a fixed bias circuit the stability factor is
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Lower stability factor ⇒ better circuit stability.
Updated On: Jul 2, 2026
- \(\beta + 1\)
- \(\beta - 1\)
- \(\frac{1}{\beta - 1}\)
- \(1 + \beta\)
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The Correct Option is D
Solution and Explanation
Concept:
Stability factor \(S\) measures sensitivity of collector current to leakage current.
\[
S = \frac{\partial I_C}{\partial I_{CO}}
\]
Step 1: Fixed bias configuration In fixed bias, base current is independent of collector current.
Step 2: Expression for collector current \[ I_C = \beta I_B + (1+\beta) I_{CO} \]
Step 3: Differentiate w.r.t \(I_{CO}\) \[ S = \frac{dI_C}{dI_{CO}} = 1 + \beta \]
Step 4: Interpretation Large \(\beta\) → poor stability.
Step 5: Conclusion \[ \boxed{1 + \beta} \]
Final Answer: \[ \boxed{(D)} \]
Step 1: Fixed bias configuration In fixed bias, base current is independent of collector current.
Step 2: Expression for collector current \[ I_C = \beta I_B + (1+\beta) I_{CO} \]
Step 3: Differentiate w.r.t \(I_{CO}\) \[ S = \frac{dI_C}{dI_{CO}} = 1 + \beta \]
Step 4: Interpretation Large \(\beta\) → poor stability.
Step 5: Conclusion \[ \boxed{1 + \beta} \]
Final Answer: \[ \boxed{(D)} \]
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