PIN DIODE CORPORATE INSTITUTE OF SCIENCE & TECHNOLOGY, BHOPAL DEPARTMENT OF ELECTRONICS & COMMUNICATIONS BY- PROF. RAKESH k. JHA.

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PIN DIODE CORPORATE INSTITUTE OF SCIENCE & TECHNOLOGY, BHOPAL DEPARTMENT OF ELECTRONICS & COMMUNICATIONS BY- PROF. RAKESH k. JHA

2  PIN diode consists of heavily doped P and N regions separated by a wide intrinsic region.

3  Intrinsic region offers the high resistance to the current through it.  The wide intrinsic region makes the PIN diode an inferior rectifier (one typical function of a diode), but it makes the PIN diode suitable for attenuators, fast switches, photo detectors, and high voltage power electronics applications.  PIN diode works as an ordinary PN junction diode frequencies up to a 100 MHZ.  Above 100 MHZ it seizes its operation of rectifier and behaves as a switch or resistance.  In reverse bias it acts as a capacitor.

CONSTRUCTION.

5 BIASING OF PIN DIODE 1.UNBIASED : when the PIN is unbiased there is a diffusion of electron across the junction. Depletion region is formed between PI and IN regions with more penetration in intrinsic region. 2.FORWARD BIAS : When the diode is forward biased, the injected carrier concentration is typically several orders of magnitude higher than the intrinsic level carrier concentration.  Due to this high level injection, which in turn is due to the depletion region, the electric field extends deeply (almost the entire length) into the region.

6  This electric field helps in speeding up of the transport of charge carriers from P to N region, which results in faster operation of the diode, making it a suitable device for high frequency operations.  IN forward bias the diode behaves as a variable resistance and resistance decreases with increase in forward bias voltage. K A Variable resistor in forward bias

7 Reverse Bias : As the reverse bias voltage is increased the depletion layer thickness increases. The device behaves as a variable capacitor until the intrinsic region becomes free of mobile carriers.  This voltage is called swept out voltage.  At this voltage the device works as a constant capacitor. K A CRCR

8 APPLICATIONS  RF and dc controlled microwave switches  RF and variable attenuator  In limiter circuit  Photo detector and photo voltaic cell  RF modulator circuit.

9