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Assertion (A): PIN diode is commonly used for microwave control. Reason (R): A PIN diode uses heavily doped p and n materials.

Correct Answer: Both A and R are correct but R is not correct explanation of A

Explanation:

A PIN diode has an intrinsic (i) layer between p and n layers. When reverse bias is applied depletion layers are formed at p-i and i-n junctions.


The effective/width of depletion layer increases by the width of i layer. It can be used as a voltage controlled attenuator.


At high frequencies the rectification effect ceases and impedance of diode is effectively that of i layer.


This impedance varies with the applied bias. It is used in high frequency switching circuits, limiters, modulators etc.


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