CIRCUIT COMPONENTS
Diodes
What is the most useful characteristic of a Zener diode?
A Zener Diode is a diode that allows voltage to flow from anode to cathode under normal circumstances, but also allows voltage to reverse direction (called the Zener effect) when it reaches its Zener Voltage. They are commonly used in voltage reference circuits.
The voltage drop remains relatively constant under varying current.
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What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?
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.
See Schottky_diode on Wikipedia.
When something is Schott (shot), it typically will drop
Hint: The wrong answers all go in the same direction: Higher, More and Longer.
The correct answer goes opposite with 'Less'.
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What type of bias is required for an LED to emit light?
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.*
MEMORY AID: "We were LEaD FORWARD"
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What type of semiconductor device is designed for use as a voltage-controlled capacitor?
In electronics, the following:
are types of diode whose capacitance varies as a function of the voltage applied across its terminals.
http://en.wikipedia.org/wiki/Varicap
Hint: "V" in voltage, "V" in varactor diode.
Also think variable capacitor diode.
Logical hint: The word varactor is made of two main parts: "v" and "actor." I think of it as being voltage reactor. Reactor means that it reacts to changes, in this case changes in voltage.
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What characteristic of a PIN diode makes it useful as an RF switch?
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 because it has low junction capacitance.
Remember, in a capacitor, the greater the distance between the plates or other conducting surfaces, the lower the capacitance.
Test Hint: PIN - 3 letters. Answer - 3 words
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What is the failure mechanism when a junction diode fails due to excessive current?
Some of the power that flows through a junction diode is dissipated in the form of heat. If a diode becomes too hot it will be damaged or destroyed.
When a component is damaged, we may say "it let the smoke out." Think "smoke," think "fire." Think "fire," think "hot."
silly hint: Both the question and the correct answer contain the word junction
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Which of the following is a Schottky barrier diode?
A hot-carrier diode (Schottky diode) is used as a VHF/UHF mixer or detector. In construction, a metal–semiconductor junction is formed between a metal and a semiconductor, creating a Schottky barrier (instead of a semiconductor–semiconductor junction as in conventional diodes).
https://en.wikipedia.org/wiki/Schottky_diode
Hint: "Semiconductor" is in the answer. Think a barrier made out of metal!!
Hint 2: Schottky and Semiconductor both start with S.
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What is a common use for point-contact diodes?
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
Hint: to make "Contact" between two "Points" you'll need a "Detector"
Hint: "Diode" and "Detector" both start with D.
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The arrows coming off the diode represent the emission of photons. So symbol 5 is a diode that emits photons-- also known as a light emitting diode.
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What is used to control the attenuation of RF signals by a PIN diode?
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)
Remember that you can have both an AC and a DC component of current flow in a circuit. In this case, a DC component is used to control the AC component.
Hint: Think of "control the current" (only answer that has "current" in it.
Silly hack: You have to enter the PIN to move forward
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