Discussion :: Microwave Communication
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Assertion (A): PIN diode is used as a fast switch.
Reason (R): PIN diode has very high resistance when reverse biased and very low resistance when forward biased.
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A.
Both A and R are correct and R is correct explanation of A
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B.
Both A and R are correct but R is not correct explanation of A
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C.
A is correct but R is wrong
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D.
A is wrong but R is correct
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Answer : Option 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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