Find vo in the circuit of Fig. 5.95, assuming that Rf = (open circuit)

If the same 741 op amp in Example 5.1 is used in the circuit of Fig.5.7, calculate the closed-loop gain vovs. Find io when vs = 1 V.

Repeat Example 5.1 using the ideal op amp model.

Find the output of the op amp circuit shown in Fig. 5.13. Calculate the current through the feedback resistor

Two kinds of current -to-voltage converters (also known as transresistance amplifiers) are shown in Fig. 5.15.

Calculate vo in the circuit of Fig. 5.20.

Find vo and io in the op amp circuit shown in Fig. 5.23.

Design a dif ference amplifier with gain 7.5.

Obtain io in the instrumentation amplifier circuit of Fig. 5.27

Determine vo and io in the op amp circuit in Fig. 5.30.

If v1 = 5 V and v2 = 5 V, find vo in the op amp circuit of Fig. 5.33.

Rework Practice Prob. 5.1 using PSpice

A three-bit DAC is shown in Fig. 5.37. (a) Determine |Vo| for [V1V2V3] = [010]. (b) Find |Vo| if [V1V2V3] = [110]. (c) If |Vo| = 1.25 V is desired, what should be [V1V2V3]? (d) To get |Vo| = 1.75 V, what should be [V1V2V3]?

Determine the value of the external gain-setting resistor RG required for the IA in Fig. 5.38 to produce a gain of 200 when R = 25 k.

Determine the output voltage vo in the circuit of Fig.5.53.

(a) Determine the ratio vois in the op amp circuit of Fig. 5.54. (b) Evaluate the ratio for R1 = 20 k, R2 = 25 k, R3 = 40 k.

Using Fig. 5.55, design a problem to help students better understand inverting op amps.

Calculate the gain vovi when the switch in Fig. 5.56 is in: (a) position 1 (b) position 2 (c) position 3.

For the circuit shown in Figure 5.57, solve for the Thevenin equivalent circuit looking into terminals A and B.

Determine io in the circuit of Fig. 5.58.

In the circuit of Fig. 5.59, calculate vo of vs = 2 V.

Calculate vo in the op amp circuit of Fig. 5.60.

Design an inverting amplifier with a gain of 15.

For the op amp circuit in Fig. 5.61, find the voltage gain vovs.

In the circuit shown in Fig. 5.62, find k in the voltage transfer function vo = kvs.

Calculate vo in the op amp circuit of Fig. 5.63.

Using Fig. 5.64, design a problem to help other students better understand noninverting op amps.

Find vo in the op amp circuit of Fig. 5.65.

Find io in the op amp circuit of Fig. 5.66

Determine the voltage gain vovi of the op amp circuit in Fig. 5.67.

In the circuit shown in Fig. 5.68, find ix and the power absorbed by the 20-k resistor.

For the circuit in Fig. 5.69, find ix.

Calculate ix and vo in the circuit of Fig. 5.70. Find the power dissipated by the 60-k resistor.

Refer to the op amp circuit in Fig. 5.71. Calculate ix and the power absorbed by the 3-k resistor.

Given the op amp circuit shown in Fig. 5.72, express vo in terms of v1 and v2.

Design a noninverting amplifier with a gain of 7.5

For the circuit shown in Fig. 5.73, find the Thevenin equivalent at terminals a-b. (Hint: To find RTh, apply a current source io and calculate vo.)

Determine the output of the summing amplifier in Fig. 5.74.

Using Fig. 5.75, design a problem to help other students better understand summing amplifie

For the op amp circuit in Fig. 5.76, determine the value of v2 in order to make vo = 16.5 V.

Referring to the circuit shown in Fig. 5.77, determine Vo in terms of V1 and V2.

An averaging amplifier is a summer that provides an output equal to the average of the inputs. By using proper input and feedback resistor values, onecan get vout = 1 __ 4 (v1 + v2 + v3 + v4) Using a feedback resistor of 10 k, design an

The feedback resistor of a three-input averaging summing amplifier is 50 k. What are the values of R1, R2, and R3?

The feedback resistor of a five-input averaging summing amplifier is 40 k. What are the values of R1, R2, R3, R4, and R5?

Show that the output voltage vo of the circuit in Fig.5.78 is vo = (R3 + R4) _________ R3(R1 + R2) (R2v1 + R1v2)

Design an op amp circuit to perform the following operation: vo = 3.5v1 2.5v2 All resistances must be 100 k.

Using only two op amps, design a circuit to solve vout = v3 v1 ______ 5 + v1 v2 ______ 2

The circuit in Fig. 5.79 is for a difference amplifier. Find vo given that v1 = 1 V and v2 = 2 V.

The circuit in Fig. 5.80 is a differential amplifier driven by a bridge. Find vo.

Design a difference amplifier to have a gain of 4 and a common-mode input resistance of 20 k at each input.

Design a circuit to amplify the difference between two inputs by 2.5. (a) Use only one op amp. (b) Use two op amps

Using two op amps, design a subtractor

Design an op amp circuit such that vo = 4v1 + 6v2 3v3 5v4 Let all the resistors be in the range of 20 to 200 k.

The ordinary difference amplifier for fixed-gain operation is shown in Fig. 5.81(a). It is simple and reliable unless gain is made variable. One way of providing gain adjustment without losing simplicity and accuracy is to use the circuit in Fig. 5.81(b). Another way is to use the circuit in Fig. 5.81(c). Show that: (a) for the circuit in Fig. 5.81(a), vo ___ vi = R2 ____ R1 (b) for the circuit in Fig. 5.81(b), vo ___ vi = R2 ____ R1 1 _______ 1 + R1 ____ 2RG (c) for the circuit in Fig. 5.81(c), vo __ vi = R2 ___ R1 (1 + R2 ____ 2RG )

Determine the voltage transfer ratio vovs in the op amp circuit of Fig. 5.82, where R = 10 k.

In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. The individual voltage gains of the first two stages are to be equal, while the gain of the third is to be one- fourth of each of the first two. Calculate the voltage gain of each.

Using Fig. 5.83, design a problem to help other students better understand cascaded op amps.

Find vo in the op amp circuit of Fig. 5.8

Calculate io in the op amp circuit of Fig. 5.85

In the op amp circuit of Fig. 5.86, determine the voltage gain vovs. Take R = 10 k.

Calculate vovi in the op amp circuit of Fig. 5.87.

Calculate vovi in the op amp circuit of Fig. 5.87.

Obtain the closed-loop voltage gain vovi of the circuit in Fig. 5.89.

Determine the gain vovi of the circuit in Fig. 5.90.

For the op amp circuit shown in Fig. 5.91, find vovs.

Find vo in the op amp circuit of Fig. 5.92.

For the circuit in Fig. 5.93, find vo.

Obtain the output vo in the circuit of Fig. 5.94.

Find vo in the circuit of Fig. 5.95, assuming that Rf = (open circuit).

Repeat the previous problem if Rf = 10 k.

Determine vo in the op amp circuit of Fig. 5.96.

Determine vo in the op amp circuit of Fig. 5.97.

Find the load voltage vL in the circuit of Fig. 5.98.

Determine the load voltage vL in the circuit of Fig.5.99.

Find io in the op amp circuit of Fig. 5.100.

Rework Example 5.11 using the nonideal op amp LM324 instead of uA741

Solve Prob. 5.19 using PSpice or MultiSim and op amp uA741.

Solve Prob. 5.48 using PSpice or MultiSim and op amp LM324

Use PSpice or MultiSim to obtain vo in the circuit of Fig. 5.101.

Determine vo in the op amp circuit of Fig. 5.102, using PSpice or MultiSim

Use PSpice or MultiSim to solve Prob. 5.70.

Use PSpice or MultiSim to verify the results in Example 5.9. Assume nonideal op amps LM324.

A four-bit DAC covers a voltage range of 0 to 10V. Calculate the resolution of the DAC in volts per discrete binary step.

Design a six-bit digital-to-analog converter. (a) If |Vo| = 1.1875 V is desired, what should [V1V2V3V4V5V6] be? (b) Calculate |Vo| if [V1V2V3V4V5V6] = [011011]. (c) What is the maximum value |Vo| can assume?

A four-bit R-2R ladder DAC is presented in Fig. 5.103. (a) Show that the output voltage is given by Vo = Rf ( V1 ___ 2R + V2 ___ 4R + V3 ___ 8R + V4 ___ 16R ) (b) If Rf = 12 k and R = 10 k, find |Vo| for [V1V2V3V4] = [1011] and [V1V2V3V4] = [0101].

In the op amp circuit of Fig. 5.104, find the value of R so that the power absorbed by the 10-k resistor is 10 mW. Determine the power gain.

Design a voltage controlled ideal current source (within the operating limits of the op amp) where the output current is equal to 200 vs(t) A.

Figure 5.105 displays a two-op-amp instrumentation amplifier. Derive an expression for vo in terms of v1and v2. How can this amplifier be used as a subtractor?

Figure 5.106 shows an instrumentation amplifier driven by a bridge. Obtain the gain vovi of the amplifier.

Design a circuit that provides a relationship between output voltage vo and input voltage vs such that vo = 12vs 10. Two op amps, a 6-V battery, and several resistors are available.

The op amp circuit in Fig. 5.107 is a current amplifier. Find the current gain iois of the amplifier.

A noninverting current amplifier is portrayed in Fig.5.108. Calculate the gain iois. Take R1 = 8 k and R2 = 1 k.

Refer to the bridge amplifier shown in Fig. 5.109. Determine the voltage gain vovi.

A voltage-to-current converter is shown in Fig.5.110, which means that iL = Avi if R1R2 = R3R4. Find the constant term A.