ITEC 320 Exam 3 Flashcards Preview

Module 4, Lesson 3 > ITEC 320 Exam 3 > Flashcards

Flashcards in ITEC 320 Exam 3 Deck (139)
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1

Field-effect transistor

A transistor controlled by voltage rather than by current. The flow of current is controlled by the effects of an electric field.

2

Gate

An element in a FET. It is the control element of the devices. It corresponds to the base of a bipolar transistor.

3

Drain

The terminal of a FET that is the drain for charge carriers from the FET channel.

4

Source

In general, the origin of the electrical energy supplied to a device. In FET's, it is one of the electrodes.

5

The FET is a semiconductor device in which output current is controlled by

An electric field or gate

6

The control element in a FET is the

Gate

7

The point at which an increase in voltage from source to drain no longer produces an increase in current is called

Saturation current

8

When the negative gate voltage (VGS) stops the current flow from source to drain, the FET has reached its

Cutoff voltage

9

Does the FET have a high or low input impedance

High

10

Common-source amplifier

An amplifier in which an FET is the active device. The source of the FET is common to the input and output circuits. Input is applied to the gate and the output is applied to the drain

11

Does the common-source FET amplifier require complicated bias arrangements, why or why not

No, because we do not need reverse bias and its self-biased.

12

Common-source FET amplifiers have a high input

Impedance

13

How many degrees is the phase shift between input and output signals in a common-source amplifier

180 degrees

14

What type of input signal does a common-source FET amplifier require to produce a large output signal

Powerful input signal (4/10v)

15

Source-follower

An amplifier where the drain is common to the input and output circuits. Input is applied to the gate. Output occurs at the source. Voltage gain is less than 1

16

Emitter-follower

A transistor stage in which the collector is common to the input and output circuits. Input is applied to the base. Output occurs at the emitter. Voltage gain is less than 1

17

In a source-follower circuit, how many degrees is the output inverted from the input

Its not, they follow one another or zero

18

Does a source-follower have a high or low output impedance

Low

19

The voltage gain of a source-follower is less than

1

20

The source-follower has a fairly poor what

Gain

21

Does the source-follower circuit have a high or low input impedance

High

22

The FET is a semiconductor device in which an electrical field within the device controls

Output current

23

You can increase or decrease the electric field within a FET with the amount of voltage applied to the

Gate

24

The electric field in a FET determines the amount of current flowing from the

Source to drain

25

An advantage of a FET is its

High input impedance

26

FET's use what as part of their circuitry

Self-bias

27

FET's need what to produce a large output at the load

A small amount of input power

28

A common-source amplifier accepts and amplifies a

Fairly wide range of frequencies

29

Voltage gain formula

Output voltage/input voltage

30

The output of a source-follower is take from a resistor in the

Source circuit