What are the applications of PIN diode?
PIN diodes, which sandwich a lightly doped intrinsic (I) region between heavily doped P and N regions, are used extensively in RF and microwave applications. Common applications of PIN diodes are microwave switches, phase shifters, and attenuators, where high isolation and low loss are required.
What is dark current in PIN diode?
In physics and in electronic engineering, dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge-coupled device even when no photons enter the device; it consists of the charges generated in the detector when no outside …
What are photodiodes used for?
Photodiodes are used in consumer electronics devices such as compact disc players, smoke detectors, medical devices and the receivers for infrared remote control devices used to control equipment from televisions to air conditioners. For many applications either photodiodes or photoconductors may be used.
For what are PIN diode used in microwave?
The p-i-n diode has found wide application in microwave circuits. It can be used as a microwave switch with essentially constant depletion-layer capacitance (equal to that of a parallel-plate capacitor having a distance between the plates equal to the i-region thickness) and high power-handling capability.
What are the advantages of PIN diode over PN diode?
PIN diode uses and advantages High voltage rectifier: The PIN diode can be used as a high voltage rectifier. The intrinsic region provides a greater separation between the PN and N regions, allowing higher reverse voltages to be tolerated. RF switch: The PIN diode makes an ideal RF switch.
Why does dark current exist?
The primary cause for a dark current is usually thermionic emission on the photocathode. This means the thermal excitation of electrons. Thermionic emission can be substantial for cathode materials with very low work function, as required for infrared detection.
What is dark current?
Dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge-coupled device even when no photons are entering the device; it consists of the charges generated in the detector through heat,when no outside radiation is entering the …
Why are photodiodes used in reverse bias?
Solution : A photodiode is used to detect optical signals. The fractional change in the minority carrier dominated reverse bias current due to the photoeffect is more easily measurable than fractional change in forward bias current. Hence a photodiode is preferably operated in reverse bias condition.
Which are the application of PIN diode Mcq?
A PIN diode is frequently used as a switching diode for frequencies up to GHz range, it is a microwave switch. In PIN diode the intrinsic semiconductor is sandwiched in between high doped P and high doped N regions. PIN diodes offer very small switching times.
When PIN diode is used as a switch?
Explanation: A PIN diode can be used in either a series or a shunt configuration to form a single pole single throw switch. In the series configuration, the switch is on when the diode is forward biased and off when the diode is reverse biased. 7.
How is PIN diode used as optical detector?
The PIN diode is used as a photo detector to convert the light into the current which takes place in the depletion layer of a photo diode, rising the depletion layer by inserting the intrinsic layer progresses the performance by increasing the volume in where light change occurs.
What is the principle of PIN diode?
The pin diode consists of heavily doped p and n regions separated by an intrinsic (i) region, as shown in Figure (a). When reverse-biased, the pin diode acts like a nearly constant capacitance. When forward-biased, it acts like a current-controlled variable resistance.
How can we reduce dark current?
Dark currents, can however, be reduced by using a protective guard ring of conductive material. Proper biasing of this structure further reduces the dark operation in pixel operation. The two photocurrents can be generated by illuminating the array of the pixels with two uniform but different light intensities.
What is dark current in phototransistor?
For phototransistors, the dark current is the leakage current of the collector-base junction multiplied by the dc current gain of the transistor. It prevents the phototransistor from being completely “off” as an ideal switch.
What is meant by the dark current?
Definition of dark current : the current through a photoelectric or photoconductive cell when an electromotive force is applied in the absence of light.