The Schottky diode also known as hot carrier diode, is a semiconductor diode with a low forward voltage drop and a very fast switching action. The cat's-whisker detectors used in the early days of wireless and metal rectifiers used in early power applications can be considered primitive Schottky diodes.
When forward current flows through a solid-state diode, there is a small voltage drop across its terminals. A silicon diode has a typical voltage drop of 0.6–0.7 V, while a Schottky diode has a voltage drop of 0.15–0.45 V. This lower voltage drop can be used to give higher switching speeds and better system efficiency.
The Schottky diode is often used as a voltage limiter (aka clamp or bypass diode), in reverse bias.
When something is Schott (shot), it typically will drop
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Tunnel Diodes are used in frequency converters and detectors. They have negative differential resistance in part of their operating range, and therefore are also used as oscillators, amplifiers, and in switching circuits using hysteresis.
Hint think of shouting down a long underground tunnel, your voice will be amplified and echo(oscillate) W9ECO
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In electronics, the following:
are types of diode whose capacitance varies as a function of the voltage applied across its terminals.
Hint: "V" in voltage, "V" in varactor diode.
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The I in PIN means intrinsic!
Wikipedia: A PIN diode is a diode with a wide, undoped intrinsic semiconductor region between a p-type semiconductor and an n-type semiconductor region. The p-type and n-type regions are typically heavily doped because they are used for ohmic contacts.
The wide intrinsic region is in contrast to an ordinary PN diode. 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, photodetectors, and high voltage power electronics applications.
Test Hint: The "I" in PIN would indicate the "I" in Intrinsic.
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A hot carrier diode is also known as a Schottky Diode. It's a fast switching diode (due to low capacitance) with a low forward voltage drop. Their fast switching makes them effective as a mixer or detector at VHF/UHF frequencies.
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Point contact diodes are derived from crystal detectors and are good high frequency detectors. The key word is "detector"
Complete explanation here: https://electronicscoach.com/point-contact-diode.html
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A PIN diode is a semiconductor device that operates as a variable resistor at RF and microwave frequencies. One common use for PIN diodes is as an RF switch. (E6B12)The characteristic of a PIN diode that makes it useful as an RF switch or attenuator is a large region of intrinsic material. (E6B05) The forward DC bias current is used to control the attenuation of RF signals by a PIN diode. (E6B11)
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Under zero or reverse bias, a PIN diode has a low capacitance. The low capacitance will not pass much of an RF signal. Under a forward bias of 1 mA, a typical PIN diode will have an RF resistance of about 1 ohm, making it a good RF conductor. Consequently, the PIN diode makes a good RF switch.
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Before a light emitting diode can “emit” any form of light it needs a current to flow through it, as it is a current dependent device with their light output intensity being directly proportional to the forward current flowing through the LED.
In electronics, bias is a steady voltage, magnetic field, or other factor applied to an electronic system or device to cause it to operate over a predetermined range.*
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