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O strand > Semi-conductors > Flashcards

Semi-conductors Flashcards

1
Q

Schematic designation for diode

A

C, or D

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2
Q

Most used semiconductors

A

Germanium and silicon

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3
Q

Process of adding impurities to semi-conductor material

A

Doping

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4
Q

Electrons

A

N type material

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5
Q

Holes

A

P type material

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6
Q

Where p and n material meet is called the…

A

PN Junction

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7
Q
A
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8
Q

Narrow area of recombination across PN junction.(no mobile carriers present)

A

Depletion region

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9
Q

Electrostatic field caused by ions formed through recombination in the depletion region

A

Barrier potential

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10
Q

Silicon requires_to_volts to overcome barrier potential

A

.6,.7

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11
Q

Germanium requires

A

.2 to .3 v

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12
Q

Point where excessive reverse bias voltage causes bonds in the depletion region to break apart

A

Breakdown

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13
Q

Breakdown below 6vdc is called…

A

Zener effect

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14
Q

Breakdown above 6vdc is called…

A

Avalanche effect

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15
Q

Types of diodes

A

Junction, Leds, zener

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16
Q

Only allows current to flow in one direction ( if put in reverse bias diode acts like a open switch)

A

Junction diode

17
Q

Primarily used in voltage regulators

A

Zener diode

18
Q

Zener diode must be placed in … to operate properly. If put in … bias it operates as a junction diode

A

Reverse bias, forward bias

19
Q

Does LED have filament?

A

No

20
Q

LEDs are emitted in the form of…

A

Photons

21
Q

A four layer, two electrode semiconductor diode used for producing trigger pulses

A

Shockley diode

22
Q

Is essentially a Shockley diode with an electrode connected to the internal p material

A

Silicon Controlled rectifier

23
Q

SCR is used to generate…

A

Sharp trigger pulses

24
Q

Used to switch, control or amplify an electrical signal

A

Transistor

25
Q

Heavily doped

A

Emitter

26
Q

Lightly doped

A

Base

27
Q

Moderately doped

A

Collector

28
Q

Increasing the … too much causes the transistor to go into saturation causing the collector current to no longer increase

A

Base bias

29
Q

Used as amplifiers and electronic switches

A

Transistors

30
Q

Uses a electrostatic field to control current flow

A

JFETS

31
Q

Gate is insulated from the channel by a thin layer of silicon dioxide Leads to high input resistance and virtually no input current

A

MOSFET

32
Q

Normally on but must be biased off

A

Depletion MOSFET

33
Q

Normally off but must be biased on

A

Enhancement MOSFET

34
Q

Electrostatic Discharge

A

Hazard to MOSFET

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