Consider the following statements regarding Analog Circuits – Diodes:1.A diode conducts when forward-biased and blocks current in reverse bias condition ideally.2.The cut-in voltage for silicon diode is approximately 0.7 V.3.In reverse biased, small leakage current flows due to minority carriers.4.Diode behaves as linear element under all operating conditions.Which of the above statements is/are correct?
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It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current; practical reverse current includes a small minority-carrier leakage until breakdown. For a silicon diode, the familiar constant-drop approximation is about 0.7 V. Key relation: Shockley form: I≈I_S(e^(V_D/nV_T)−1).
Exam focus: Use 0.7 V only as a practical silicon approximation. Common trap: A diode is not a linear element over its full operating range.
Formula / Key Relation
Shockley form: I≈IS(e^(VD/nVT)−1).
Detailed Explanation
Correct Answer: D - 1, 2 and 3 only Quick Concept Explanation It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current; practical reverse current includes a small minority-carrier leakage until breakdown. For a silicon diode, the familiar constant-drop approximation is about 0.7 V. Key relation: Shockley form: I≈I_S(e^(V_D/nV_T)−1).Exam focus: Use 0.7 V only as a practical silicon approximation. Common trap: A diode is not a linear element over its full operating range. Statement-wise Verification Statement 1 - Correct.A diode conducts when forward-biased and blocks current in reverse bias condition ideally.It conducts strongly in forward…
Correct Answer: D - 1, 2 and 3 only
Quick Concept Explanation
It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current; practical reverse current includes a small minority-carrier leakage until breakdown. For a silicon diode, the familiar constant-drop approximation is about 0.7 V. Key relation: Shockley form: I≈I_S(e^(V_D/nV_T)−1).
Exam focus: Use 0.7 V only as a practical silicon approximation. Common trap: A diode is not a linear element over its full operating range.
Statement-wise Verification
Statement 1 - Correct. A diode conducts when forward-biased and blocks current in reverse bias condition ideally. It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current
Statement 2 - Correct. The cut-in voltage for silicon diode is approximately 0.7 V. For a silicon diode, the familiar constant-drop approximation is about 0.7 V.
Statement 3 - Correct. In reverse biased, small leakage current flows due to minority carriers. Practical reverse current includes a small minority-carrier leakage until breakdown.
Statement 4 - Incorrect. Diode behaves as linear element under all operating conditions. The correct principle is: A pn-junction diode is nonlinear.
Core Concept
A pn-junction diode is nonlinear. It conducts strongly in forward bias after its knee/cut-in region and ideally blocks reverse current; practical reverse current includes a small minority-carrier leakage until breakdown. For a silicon diode, the familiar constant-drop approximation is about 0.7 V.
Formula / Key Relationship
Shockley form: I≈I_S(e^(V_D/nV_T)−1).
Why the Other Options Are Wrong
Option A is incorrect because it omits correct statement(s) 3. Option B is incorrect because it includes incorrect statement(s) 4 and omits correct statement(s) 2, 3. Option C is incorrect because it omits correct statement(s) 1.
Exam Shortcut / Approach
Use 0.7 V only as a practical silicon approximation.
Common Mistake
A diode is not a linear element over its full operating range.
Quick Revision
Forward and Reverse Bias of Diode is linked with Diode Characteristics, Semiconductor Diodes and Analog Electronics. Use 0.7 V only as a practical silicon approximation.
Quick Trick
Use 0.7 V only as a practical silicon approximation.
Why Other Options Are Wrong
Option A is incorrect because it omits correct statement(s) 3. Option B is incorrect because it includes incorrect statement(s) 4 and omits correct statement(s) 2, 3. Option C is incorrect because it omits correct statement(s) 1.
Common Mistake
A diode is not a linear element over its full operating range.
Exam Tip
Use 0.7 V only as a practical silicon approximation.
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