Question
Download Solution PDFIn an optical receiver, the PIN diode has a ________ intrinsic semiconductor layer separating P and N regions, and the diode is ______ biased which helps draw the current carriers away from the intrinsic region.
Answer (Detailed Solution Below)
Detailed Solution
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Some important points related to PIN diode
- It is a diode with a wide undoped intrinsic semiconductor region between p-type and n-type semiconductors
- Due to the wide intrinsic region, the diode has low capacitance when reverse biased
- The width of the depletion region increases when the diode is in reverse bias
- At a certain reverse bias voltage, the entire intrinsic region will be swept out of charge carriers
- This is called swept-in voltage
- This helps current carriers to move away from the intrinsic region
- Since the intrinsic region is fully depleted of charge carriers, the capacitance of the diode is independent of the level of bias
- The diode is used for switching purposes when used in reverse bias
Some applications where PIN diodes are used
- R-F switch
- Photodetectors
- High Voltage Rectifier
- Attenuators
- High Voltage Power electronics devices
etc......
Hence the correct answer is option 2
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