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Operational Amplifiers and Linear Integrated Circuits

Robert F. Coughlin, Frederick F. Driscoll

Chapter 9

DC PERFORMANCE: BIAS, OFFSETS, AND DRIFT - all with Video Answers

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Chapter Questions

03:13

Problem 1

Which op amp characteristics normally have the most effect on (a) dc amplifier performance; (b) ac amplifier performance?

M Hassan Anwar
M Hassan Anwar
Numerade Educator
02:39

Problem 2

If $I_{B+}=0.2 \mu \mathrm{A}$ and $I_{B-}=0.1 \mu \mathrm{A}$, find (a) the average bias current $I_B$; (b) the offset current $I_{\text {ose }}$

AK
Ankur Khosla
Numerade Educator
04:51

Problem 3

In Example 9-2, $V_o=0.2 \mathrm{~V}$. Find $I_B-$

Manish Haldankar
Manish Haldankar
Numerade Educator
01:20

Problem 4

In Example 9-3, $V_o=-0.2 \mathrm{~V}$. Find $I_{B+}$.

Lucas Finney
Lucas Finney
Numerade Educator
06:36

Problem 5

$I_{B-}$ is $0.2 \mu \mathrm{A}$ in Fig. 9-2(c). Find $V_o$.

Thomas Thompson
Thomas Thompson
Numerade Educator
02:21

Problem 6

In Fig. 9-4(a), $R_f=R_G=100 \mathrm{k} \Omega . I_{B+}=0.3 \mu \mathrm{A}$ and $I_{E^{-}}=0.2 \mu \hat{\mathrm{A}}$. Find $V_o$.

Manik Pulyani
Manik Pulyani
Numerade Educator
02:21

Problem 7

In Fig. 9-4(b), $R_f=R_i=25 \mathrm{k} \Omega$ and $R=12.5 \mathrm{k} \Omega$. If $I_{o r}=0.1 \mu \mathrm{A}$, find $V_o$.

Manik Pulyani
Manik Pulyani
Numerade Educator

Problem 8

In Fig. 9-4(b), $R_i=R_f=25 \mathrm{k} \Omega$ and $R=12.5 \mathrm{k} \Omega$. If $I_{o y}=-6 . \mathrm{i} \mu \mathrm{A}$, find $V_{\sigma .}$

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03:20

Problem 9

In Fig. 9-6(b), $V_o=200 \mathrm{mV}$. Find $V_{i o}$.

Vishal Gupta
Vishal Gupta
Numerade Educator
02:07

Problem 10

Resistors $R_1, R_2, R_3$, and $R_f$ all equal $20 \mathrm{k} \Omega$ in Fig. 9-7(a). $E_1=E_2=E_3=V_{l o}=2 \mathrm{mV}$. Find (a) the actual value of $V_o$; (b) $V_o$ assuming that $V_{i o}=0$.

Sanjeev Kumar
Sanjeev Kumar
Numerade Educator
01:21

Problem 11

What value of current-compensating resistor should be added in Problem 9-10?

Varsha Aggarwal
Varsha Aggarwal
Numerade Educator
01:55

Problem 12

What is the general procedure to null the dc output voltage of an op amp to $0 \mathrm{~V}$ ?

Nikhil Kumar Rajpurohit
Nikhil Kumar Rajpurohit
Numerade Educator
04:56

Problem 13

In Fig. 9-9, $V_{i o}$ changes by $\pm 0.5 \mathrm{mV}$ when the temperature changes by $50^{\circ} \mathrm{C}$. What is the change in $V_o$ due to the change in $V_{i o}$ ?

João Gabriel Alencar Caribé
João Gabriel Alencar Caribé
Numerade Educator
01:49

Problem 14

$I_{o s}$ changes by $\pm 2 \mathrm{nA}$ in Fig. $9-9$ for a temperature change of $50^{\circ} \mathrm{C}$. What is the resulting change in $V_o$ ?

Aashna Calidas
Aashna Calidas
Numerade Educator
07:20

Problem 15

$V_o=101 \mathrm{mV}$ in the circuit in Fig. 9-10(a), $V_o=201 \mathrm{mV}$ in Fig. 9- $\mathrm{iO}(\mathrm{b})$, and $V_o=-99 \mathrm{mV}$ in Fig. 9-10(c). Find (a) $V_{i o}$; (b) $I_{B-}$; (c) $I_{B+}$.

Ralph Maestre
Ralph Maestre
Numerade Educator
06:11

Problem 16

Refer to Fig. P9-16. $V_{i o}=3 \mathrm{mV}, I_{B-}=0.4 \mu \mathrm{A}$, and $I_{B^{+}}=0.1 \mu \mathrm{A}$. (a) What is the best value for resistor $R$ ? Calculate the individual error in the output voltage, $V_o$, due to (b) $V_{i o}$ only; (c) $I_{B+}$ only; (d) $I_{B-}$ oniy; (e) $I_{s s}$ only. The ideal value of $V_\sigma$ should be $1.00 \mathrm{~V}$ because of $E_i$. (f) What is the actual value of $V_o$ when both input offset voltage and current are present along with $E_i$ ?

Km Neeraj
Km Neeraj
Numerade Educator
02:29

Problem 17

An op amp's typical common-mode rejection is $110 \mathrm{~dB}$ for the change in common-mode voitage of $12 \mathrm{~V}$. What is the change of input olfiset voltage?

Nikhil Kumar Rajpurohit
Nikhil Kumar Rajpurohit
Numerade Educator

Problem 18

Refer to Maxim Integrated Products' Web site and compare their MAX4281 op amp CMRR and PSRR with the OP-177 device.

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