Question 1

Nonlinear distortion is often referred to as

Accepted Answer

A)  modulation distortion. 
B)  transistor noise. 
C)  harmonic distortion. 
D)  feedback distortion. 
A)  modulation distortion. 
B)  transistor noise. 
C)  harmonic distortion. 
D)  feedback distortion. C

Question 2

The input to a negative-feedback amplifier is

Accepted Answer

A)  a voltage only. 
B)  a current only. 
C)  either voltage or current. 
D)  regenerative. 
A)  a voltage only. 
B)  a current only. 
C)  either voltage or current. 
D)  regenerative. C

Question 3

What term describes the action of negative feedback that almost eliminates the internal op amp variations and makes the closed-loop voltage gain dependent primarily on external resistances?

Accepted Answer

A)  regulates 
B)  attenuates 
C)  stabilizes 
D)  neutralizes 
A)  regulates 
B)  attenuates 
C)  stabilizes 
D)  neutralizes C

Question 4

What is the feedback attenuation factor for the amplifier shown in Figure 17-4?

Accepted Answer

A)  0.25 
B)  0.025 
C)  3.9 
D)  2.5 
A)  0.25 
B)  0.025 
C)  3.9 
D)  2.5

Question 5

Because of the heavy negative feedback,the current-controlled current source tends to act like a perfect

Accepted Answer

A)  current-to-voltage converter. 
B)  voltage-to-current converter. 
C)  voltage amplifier. 
D)  current amplifier. 
A)  current-to-voltage converter. 
B)  voltage-to-current converter. 
C)  voltage amplifier. 
D)  current amplifier.

Question 6

What effect does negative feedback have on slew-rate distortion?

Accepted Answer

A)  more feedback less distortion 
B)  less feedback less distortion 
C)  more feedback more distortion 
D)  none 
A)  more feedback less distortion 
B)  less feedback less distortion 
C)  more feedback more distortion 
D)  none

Question 7

How does negative feedback increase the bandwidth of an amplifier?

Accepted Answer

A)  the roll-off in open-loop voltage gain means less voltage is fed back, which produces more input voltage as compensation 
B)  the roll-off in open-loop voltage gain means more voltage is fed back, which produces more input voltage as compensation 
C)  the roll-off in closed-loop voltage gain means less voltage is fed back, which produces less input voltage as compensation 
D)  the roll-off in closed-loop voltage gain means more voltage is fed back, which produces less input voltage as compensation 
A)  the roll-off in open-loop voltage gain means less voltage is fed back, which produces more input voltage as compensation 
B)  the roll-off in open-loop voltage gain means more voltage is fed back, which produces more input voltage as compensation 
C)  the roll-off in closed-loop voltage gain means less voltage is fed back, which produces less input voltage as compensation 
D)  the roll-off in closed-loop voltage gain means more voltage is fed back, which produces less input voltage as compensation

Question 8

The current-controlled voltage source amplifier is an almost perfect current-to-voltage converter because it has zero input impedance and zero output impedance.

Accepted Answer

A) True 
 B)False

Question 9

The closed-loop input impedance of a voltage-controlled voltage source is usually

Accepted Answer

A)  much larger than Rin but less than RCM. 
B)  much less than Rin but larger than RCM. 
C)  much larger than Rin and RCM. 
D)  much less than Rin and RCM. 
A)  much larger than Rin but less than RCM. 
B)  much less than Rin but larger than RCM. 
C)  much larger than Rin and RCM. 
D)  much less than Rin and RCM.

Question 10

The feedback attenuation factor indicates how much of the output voltage is attenuated before the feedback signal reaches the inverting input of an op amp.

Accepted Answer

A) True 
 B)False

Question 11

For a given op amp,the gain-bandwidth product is

Accepted Answer

A)  very low. 
B)  very high. 
C)  a variable. 
D)  a constant. 
A)  very low. 
B)  very high. 
C)  a variable. 
D)  a constant.

Question 12

A transresistance amplifier is another name for the

Accepted Answer

A)  voltage-controlled voltage source. 
B)  current-controlled voltage source. 
C)  voltage-controlled current source. 
D)  current-controlled current source. 
A)  voltage-controlled voltage source. 
B)  current-controlled voltage source. 
C)  voltage-controlled current source. 
D)  current-controlled current source.

Question 13

The worst-case error of closed-loop voltage gain occurs when the op amp open-loop voltage gain is minimum.

Accepted Answer

A) True 
 B)False

Question 14

A current-controlled current source has a

Accepted Answer

A)  very low input impedance and a very high output impedance. 
B)  very high input impedance and a very low output impedance. 
C)  very high input impedance and a very high output impedance. 
D)  very low input impedance and a very low output impedance. 
A)  very low input impedance and a very high output impedance. 
B)  very high input impedance and a very low output impedance. 
C)  very high input impedance and a very high output impedance. 
D)  very low input impedance and a very low output impedance.

Question 15

A voltage-controlled current source (VCIS)is also called a voltage-to-current converter.

Accepted Answer

A) True 
 B)False

Question 16

A current-controlled voltage source is sometimes called a transresistance amplifier.

Accepted Answer

A) True 
 B)False

Question 17

Op amps generally have a much higher value of common-mode input resistance than do discrete bipolar diff amps because

Accepted Answer

A)  a current mirror is used. 
B)  an emitter resistor is used. 
C)  a compensating capacitor is used. 
D)  regenerative feedback is used. 
A)  a current mirror is used. 
B)  an emitter resistor is used. 
C)  a compensating capacitor is used. 
D)  regenerative feedback is used.

Question 18

What concept is reinforced by noting that all of the input current of the current-controlled voltage source amplifier must flow through the feedback resistor?

Accepted Answer

A)  loop gain 
B)  feedback fraction B 
C)  virtual ground 
D)  gain-bandwidth product 
A)  loop gain 
B)  feedback fraction B 
C)  virtual ground 
D)  gain-bandwidth product

Question 19

A current-controlled current source is an ideal current amplifier because it has a stabilized current gain,zero input impedance,and infinite output impedance.

Accepted Answer

A) True 
 B)False

Question 20

A transconductance amplifier is another name for the

Accepted Answer

A)  voltage-controlled voltage source. 
B)  current-controlled voltage source. 
C)  voltage-controlled current source. 
D)  current-controlled current source. 
A)  voltage-controlled voltage source. 
B)  current-controlled voltage source. 
C)  voltage-controlled current source. 
D)  current-controlled current source.

Exam 17: Negative Feedback

Nonlinear distortion is often referred to as

The input to a negative-feedback amplifier is

What term describes the action of negative feedback that almost eliminates the internal op amp variations and makes the closed-loop voltage gain dependent primarily on external resistances?

What is the feedback attenuation factor for the amplifier shown in Figure 17-4?

Because of the heavy negative feedback,the current-controlled current source tends to act like a perfect

What effect does negative feedback have on slew-rate distortion?

How does negative feedback increase the bandwidth of an amplifier?

The current-controlled voltage source amplifier is an almost perfect current-to-voltage converter because it has zero input impedance and zero output impedance.

The closed-loop input impedance of a voltage-controlled voltage source is usually

The feedback attenuation factor indicates how much of the output voltage is attenuated before the feedback signal reaches the inverting input of an op amp.

For a given op amp,the gain-bandwidth product is

A transresistance amplifier is another name for the

The worst-case error of closed-loop voltage gain occurs when the op amp open-loop voltage gain is minimum.

A current-controlled current source has a

A voltage-controlled current source (VCIS)is also called a voltage-to-current converter.

A current-controlled voltage source is sometimes called a transresistance amplifier.

Op amps generally have a much higher value of common-mode input resistance than do discrete bipolar diff amps because

What concept is reinforced by noting that all of the input current of the current-controlled voltage source amplifier must flow through the feedback resistor?

A current-controlled current source is an ideal current amplifier because it has a stabilized current gain,zero input impedance,and infinite output impedance.

A transconductance amplifier is another name for the

Introduction

Semoconductors

Diode Theory Key

Diode Circuits

Special-Purpose Diodes Key

BJT Fumdamentals

BJT Biasing

Basic BJT Amplifiers

Multistage,CC,and CB Amplifiers

Power Amplifiers

JFETS

Mosfets

Thyristors

Frequency Effects

Differential Amplifiers

Operational Amplifiers

Linear OP AMP Circuits

Active Filters Key

Nonlinear Op-Amp Circuit Applications Key

Oscillators Key

Regulated Power Supplies Key

Filters