To answer this question, we need to understand the advantages of a PIN diode over a normal p-n junction.
A PIN diode is a type of diode that has an intrinsic (I) region sandwiched between a p-type (P) region and an n-type (N) region. This intrinsic region is lightly doped, which means it has a lower concentration of impurities compared to the p and n regions.
The advantages of a PIN diode over a normal p-n junction are:
A) Higher Speed: The intrinsic region in a PIN diode provides a larger depletion region compared to a normal p-n junction. This larger depletion region results in a faster response time when the diode is forward-biased or reverse-biased. Therefore, PIN diodes are capable of switching on and off at higher speeds, making them suitable for applications that require fast switching, such as high-frequency RF switches.
B) Increased Current Rating: The intrinsic region in a PIN diode allows for a larger area for current flow compared to a normal p-n junction. This larger area reduces the resistance and allows the PIN diode to handle higher current levels without overheating. Therefore, PIN diodes have an increased current rating compared to normal p-n junction diodes.
Therefore, the correct answer is C) Both a and b. The advantage of a PIN diode over a normal p-n junction includes higher speed and increased current rating.