Assertion (A) : In a bipolar IC fabrication, the diode isolation is used to isolate one device from the other. Reason (R) : P+n diode used as isolation diode in IC fabrication. Select your answer using the codes given below.
Both (A) and (R) are true and (R) is the correct explanation of (A).
The question concerns the concepts of diode isolation in bipolar integrated circuit (IC) fabrication, exploring both the assertion and reason provided. We must judge the truth values of the assertion and the reason and determine if the reason correctly explains the assertion.
Assertion (A): In a bipolar IC fabrication, the diode isolation is used to isolate one device from the other.
Reason (R): P+n diode used as isolation diode in IC fabrication.
Let's break down the statements:
-
Understanding the Assertion (A):
- In bipolar IC fabrication, isolation is critical to ensure that one device does not electrically interfere with another. This is often achieved using diode isolation techniques.
- Diode isolation typically involves creating pn junction diodes between devices, using them as barriers to prevent electrical coupling. Thus, the assertion that diode isolation is used to separate devices is correct.
-
Understanding the Reason (R):
- The P+n diode is a type of junction where a heavily doped p-type region (P+) and a moderately doped n-type region are used. This configuration is indeed a common method in IC fabrication for creating isolation.
- The P+n junction forms a reverse-biased condition naturally during operation, effectively isolating different regions in an IC.
Now, evaluating if (R) explains (A):
- Both statements are true. Diode isolation using P+n junctions is a standard practice in IC fabrication, providing a clear, technical reason behind the assertion of using diode isolation to prevent device interference.
Thus, the correct answer is: Both (A) and (R) are true and (R) is the correct explanation of (A).
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