A PIN diode is a
diode with a wide, undoped
intrinsic semiconductor region between
p-type semiconductor and
n-type semiconductor regions. A PIN diode obeys the standard diode equation only for very slow signals. At higher frequencies, the diode looks like an almost perfect (very linear, even for large signals) resistor. The high-frequency resistance is inversely proportional to the DC bias current through the diode. A PIN diode, suitably biased, therefore acts as a variable resistor. This high-frequency resistance may vary over a wide range (from 0.1 ohm to 10 kΩ in some cases
[1]; the useful range is smaller, though).
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Acronym for positive-intrinsic-negative diode. A
photodiode with a large, neutrally doped intrinsic region sandwiched between p-doped and n-doped semiconducting regions. Note: A PIN diode exhibits an increase in its electrical conductivity as a function of the
intensity,
wavelength, and
modulation rate of the incident
radiation. Synonym PIN photodiode.
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