Question 1

The input stage of an op- amp is a differential amplifier.

Accepted Answer

A) True 
 B)False  True

Question 2

Figure 2
-Refer to Figure 2. The circuit or circuits with a virtual ground is

Accepted Answer

A) (a) 
B) (b) 
C) (c)and (d) 
D) all of these 
A) (a) 
B) (b) 
C) (c)and (d) 
D) all of these A

Question 3

Figure 2
-Refer to Figure 2(a). The closed- loop gain, ACL, is

Accepted Answer

A) +7.8 
B) +6.8 
C) -6.8 
D) -7.8 
A) +7.8 
B) +6.8 
C) -6.8 
D) -7.8 C

Question 4

Figure 4 Both op- amps are compensated and have AS1U1B1OL S1U1B0= 100 dB and fS1U1B1T S1U1B0= 2 MHz.
-Refer to Figure 4(b). If the feedback resistor is open, the BW will equal

Accepted Answer

A) fT 
B) 0 
C) fc(ol)  
D) none of the above 
A) fT 
B) 0 
C) fc(ol)  
D) none of the above

Question 5

When the closed loop gain, ACL, is equal to 0 dB, the bandwidth is

Accepted Answer

A) the same as at fc 
B) minimum 
C) maximum 
D) none of the above 
A) the same as at fc 
B) minimum 
C) maximum 
D) none of the above

Question 6

The open- loop gain is determined by the feedback circuit.

Accepted Answer

A) True 
 B)False

Question 7

Assume an op- amp has three different internal critical frequencies that are above the fT. The overall roll- off rate is

Accepted Answer

A) a constant -60 dB/decade 
B) a composite of the three critical frequencies 
C) the average of the three critical frequencies 
D) a constant -20 dB/decade 
A) a constant -60 dB/decade 
B) a composite of the three critical frequencies 
C) the average of the three critical frequencies 
D) a constant -20 dB/decade

Question 8

A typical op- amp

Accepted Answer

A) uses dc coupling 
B) has two supply voltages 
C) has very high open- loop gain 
D) all of the above 
A) uses dc coupling 
B) has two supply voltages 
C) has very high open- loop gain 
D) all of the above

Question 9

Common- mode rejection ratio (CMRR)depends on the

Accepted Answer

A) input voltage 
B) frequency 
C) bias current 
D) all of the above 
A) input voltage 
B) frequency 
C) bias current 
D) all of the above

Question 10

Figure 2
-Refer to Figure 2(c). The closed- loop gain, ACL, is

Accepted Answer

A) -9.2 
B) +9.2 
C) +8.2 
D) -8.2 
A) -9.2 
B) +9.2 
C) +8.2 
D) -8.2

Question 11

Figure 2
-Refer to Figure 2. The circuit with the lowest input impedance is

Accepted Answer

A) (a) 
B) (b) 
C) (c) 
D) (d) 
A) (a) 
B) (b) 
C) (c) 
D) (d)

Question 12

At low frequencies, voltage noise density goes up.

Accepted Answer

A) True 
 B)False

Question 13

Figure 5 The RC components shown represent internal R and C of a compensated op- amp.
-Refer to Figure 5. Assume the input frequency is much less that fc. In this case, the overall AOL is

Accepted Answer

A) dependent on the feedback 
B) equal to 1 
C) halved 
D) nearly unaffected 
A) dependent on the feedback 
B) equal to 1 
C) halved 
D) nearly unaffected

Question 14

Differential input impedance is measured from one input to ground.

Accepted Answer

A) True 
 B)False

Question 15

CMRR is the ratio of

Accepted Answer

A) differential open- loop gain to differential closed loop gain 
B) inverting open- loop gain to inverting closed- loop gain 
C) differential open- loop gain to common mode gain 
D) inverting closed- loop gain to common mode gain 
A) differential open- loop gain to differential closed loop gain 
B) inverting open- loop gain to inverting closed- loop gain 
C) differential open- loop gain to common mode gain 
D) inverting closed- loop gain to common mode gain

Question 16

A common- mode input is when two equal amplitude but opposite polarity signals are applied to the inputs of a differential amplifier.

Accepted Answer

A) True 
 B)False

Question 17

Figure 2
-Refer to Figure 2(b). The feedback fraction, B, is

Accepted Answer

A) +1 
B) 0 
C) -1 
D) none of the above 
A) +1 
B) 0 
C) -1 
D) none of the above

Question 18

The need for bias current compensation is reduced by

Accepted Answer

A) using a smaller input signal 
B) using a BIFET op- amp 
C) using a larger load 
D) all of the above 
A) using a smaller input signal 
B) using a BIFET op- amp 
C) using a larger load 
D) all of the above

Question 19

Figure 2
-Refer to Figure 2. The circuit with the highest absolute gain, |ACL|, is

Accepted Answer

A) (a) 
B) (b) 
C) (c) 
D) (d) 
A) (a) 
B) (b) 
C) (c) 
D) (d)

Question 20

Figure 4 Both op- amps are compensated and have AS1U1B1OL S1U1B0= 100 dB and fS1U1B1T S1U1B0= 2 MHz.
-Refer to Figure 4(a). The open- loop critical frequency, fc(ol), is

Accepted Answer

A) 20 Hz 
B) 2.0 Hz 
C) 100 Hz 
D) 10 Hz 
A) 20 Hz 
B) 2.0 Hz 
C) 100 Hz 
D) 10 Hz

The input stage of an op- amp is a differential amplifier.

Figure 2 -Refer to Figure 2. The circuit or circuits with a virtual ground is

Figure 2 -Refer to Figure 2(a). The closed- loop gain, ACL, is

Figure 4 Both op- amps are compensated and have A_OL= 100 dB and f_T= 2 MHz. -Refer to Figure 4(b). If the feedback resistor is open, the BW will equal

When the closed loop gain, ACL, is equal to 0 dB, the bandwidth is

The open- loop gain is determined by the feedback circuit.

Assume an op- amp has three different internal critical frequencies that are above the fT. The overall roll- off rate is

A typical op- amp

Common- mode rejection ratio (CMRR)depends on the

Figure 2 -Refer to Figure 2(c). The closed- loop gain, ACL, is

Figure 2 -Refer to Figure 2. The circuit with the lowest input impedance is

At low frequencies, voltage noise density goes up.

Figure 5 The RC components shown represent internal R and C of a compensated op- amp. -Refer to Figure 5. Assume the input frequency is much less that fc. In this case, the overall AOL is

Differential input impedance is measured from one input to ground.

CMRR is the ratio of

A common- mode input is when two equal amplitude but opposite polarity signals are applied to the inputs of a differential amplifier.

$Figure 2 -Refer to Figure 2(b). The feedback fraction, B, is$ Figure 2 -Refer to Figure 2(b). The feedback fraction, B, is

The need for bias current compensation is reduced by

Figure 2 -Refer to Figure 2. The circuit with the highest absolute gain, |ACL|, is

Figure 4 Both op- amps are compensated and have A_OL= 100 dB and f_T= 2 MHz. -Refer to Figure 4(a). The open- loop critical frequency, fc(ol), is

Introduction to Semiconductors

Diodes and Applications

Special-Purpose Diodes

Bipolar Junction Transistors

Transistor Bias Circuits

BJT Amplifiers

BJT Power Amplifiers

Field-Effect Transistors Fets

Fet Amplifiers and Switching Circuits

Amplifier Frequency Response

Thyristors

Basic Op-Amp Circuits

Special-Purpose Integrated Circuits

Active Filters

Oscillators

Voltage Regulators

Communication Devices and Methods

Filters

Exam 12: The Operational Amplifier

The input stage of an op- amp is a differential amplifier.

Figure 2 -Refer to Figure 2. The circuit or circuits with a virtual ground is

Figure 2 -Refer to Figure 2(a). The closed- loop gain, ACL, is

Figure 4 Both op- amps are compensated and have AOL = 100 dB and fT = 2 MHz. -Refer to Figure 4(b). If the feedback resistor is open, the BW will equal

When the closed loop gain, ACL, is equal to 0 dB, the bandwidth is

The open- loop gain is determined by the feedback circuit.

Assume an op- amp has three different internal critical frequencies that are above the fT. The overall roll- off rate is

A typical op- amp

Common- mode rejection ratio (CMRR)depends on the

Figure 2 -Refer to Figure 2(c). The closed- loop gain, ACL, is

Figure 2 -Refer to Figure 2. The circuit with the lowest input impedance is

At low frequencies, voltage noise density goes up.

Figure 5 The RC components shown represent internal R and C of a compensated op- amp. -Refer to Figure 5. Assume the input frequency is much less that fc. In this case, the overall AOL is

Differential input impedance is measured from one input to ground.

CMRR is the ratio of

A common- mode input is when two equal amplitude but opposite polarity signals are applied to the inputs of a differential amplifier.

Figure 2 -Refer to Figure 2(b). The feedback fraction, B, is

The need for bias current compensation is reduced by

Figure 2 -Refer to Figure 2. The circuit with the highest absolute gain, |ACL|, is

Figure 4 Both op- amps are compensated and have AOL = 100 dB and fT = 2 MHz. -Refer to Figure 4(a). The open- loop critical frequency, fc(ol), is

Introduction to Semiconductors

Diodes and Applications

Special-Purpose Diodes

Bipolar Junction Transistors

Transistor Bias Circuits

BJT Amplifiers

BJT Power Amplifiers

Field-Effect Transistors Fets

Fet Amplifiers and Switching Circuits

Amplifier Frequency Response

Thyristors

Basic Op-Amp Circuits

Special-Purpose Integrated Circuits

Active Filters

Oscillators

Voltage Regulators

Communication Devices and Methods

Filters

Figure 4 Both op- amps are compensated and have A_OL= 100 dB and f_T= 2 MHz. -Refer to Figure 4(b). If the feedback resistor is open, the BW will equal

$Figure 2 -Refer to Figure 2(b). The feedback fraction, B, is$ Figure 2 -Refer to Figure 2(b). The feedback fraction, B, is

Figure 4 Both op- amps are compensated and have A_OL= 100 dB and f_T= 2 MHz. -Refer to Figure 4(a). The open- loop critical frequency, fc(ol), is