Edevices 2 Flashcards by Aton 1

Two or more elements

Transistor

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Main applications of transistor

Switching
Amplifying

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Two elements of transistor

BJT
FET

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“IGFET”

MOSFET

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Uses both holes and electrons

BJT

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Types of BJT

NPN
PNP

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Most used BJT since most of majority carrier are electrons

NPN

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Has larger region for stability

Collector

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Is very thin for minimum recombination

Base

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___ potential at output part of bjt

Higher

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% of Ie flows at the collector

98%

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Part of bjt that is moderately doped

Collector

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Heavily doped region of bjt

Emitter

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Lightly doped

Base

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For normal operation of a pnp BJT, the base must be ____ with respect to the emitter and ____ with respect to the collector

Negative, positive

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In bipolar junction transistor, the base region is made very thib so that:

Recombination in base region is minimum

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The primary function of the bias circuit is to

Hold the circuit stable at the designed Q-point

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Used to establish a DC operating point or Q-point

DC analysis or DC biasing

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5 types of DC analysis or biasing

Fixed or base bias
Emitter stabilizer
DC collector feedback bias or self-bias
TSEB (Two-source emitter bias) or emitter bias
Combinational bias system or voltage divider

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Poor stability due to Beta dependent on temperature

Used for switching

Fixed bias or base bias

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Current gain, amplification factor

Beta

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2 to 5 biasing are used for

Amplifier

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Good for stability due to RE and CE

Emitter stabilizer bias

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In capacitor: DC is ____

Open

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In capacitor: AC is ___

Shorted

Provides an offsetting effect

Degeneration

RF mostly of high value Minimize distortion

DC collector feedback or self bias

Self bias has good stability due to ____

Degeneration

Biasing that has good stability due to two source

TSEB or emitter bias

Biasing that has good stability due to combination of bias

Combinational bias system or voltage divider bias

Negative feedback of a collector-feedback bias creates an ___ that tends to keep Q-point stable.

Offsetting effect

The disadvantage of base bias is that:

It's too bet dependent

If a splash of solder shorts, the collector resistor of TSEB, the collector voltage will:

Equal to the collector supply voltage

The saturation current of a transistor used in a fixed-bias circuit is ___ its value used in an emitter-stabilized or voltage-divider bias ckt for the same values of Rc.

More than

For Ic (sat.) Beta is too ___ Vce ~~__V (typical: Vce= 0.2 to 0.5V)

Large 0V

Fixed bias formula

Ic(sat)= Vcc/Rc

Emitter stabilizer/ VD bias formula

Ic(sat) = Vcc/(Rc + Re)

What term is used to indicage current gain in a common-collector configuration?

Gamma

Beta formula

B = 𝛄/1-𝛄

Gamma formula

𝛄 = B/1 + B

In which region are both the collector-base and base-emitter junctions forward-biased

Saturation

In which of the following amplifier configurations, the power gain is the largest?

Common emitter

Which typeof configuration has high output impedance but low input impedance? Zin ~ few ohms to 50

Common base

Hundred to kilo ohms

Common emitter

How many degree phases have been shifted from input to output in common emitter configuration?

180°

The gain of the transistor is common emitter amplifier circuit is 100 at a frequency of 1000Hz. The gain is 70.7 at 335KHz. The gain drops to 1 at 210MHz. The gain-bandwidth product is:

210MHz alpha cut-off Freq in which the gain is 70.7 Gain-bw product Freq in which the gain is 1

Manufacturers data sheets specify transistors using ___ parameters

Referred to as reverse transfer voltage ratio

Which of the following safe operating area of BJT normally only applied to power transistor?

Second breakdown

The main features of a large-signal amplifier is the circuit's ___ Power efficiency Maximum power limitations Impedance matching to the output device All of the above

All of the above

Which power amplifier can deliver maximum load power

Class C (requries high efficiency)

Class A amplifier

Pout = 0.5Vceq Iceq

Class B and AB

Pout = 0.25Vcc Ic(sat)

Class C

Pout = 0.5 Vcc²/Rc

Increases gain by minimizing the effect of re

Swamping circuit

A darlington transistor has:

A very high current gain

What is the key to FET operation?

Effective cross-sectional area of the channel

In an N chann JFET, pinch off occurs when the gate bias is

Very negative

In E-mosfet, for a fixed balue of Vt, then the higher the level of Vgs, the more the ____ level for Vds

Saturation

An n-channem e-mosfet conducts when it has:

An n-type inversion layer

A mosfet that has an initial state :on Operates only on D mode

D-mosfet

A mosfet that has initial state: off (No channel, no loss) First create a channel, then control current

E-mosfet

An E-mosfet that operates at cut-off or in the ohmic region is an example of:

A switching device

An E-mosfet that operates at saturation region is used in ____

Amplifier