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5.14 Refer to the circuit in Fig. 5.11, where the op amp PSPICE is assumed to be ideal. Given that Ra = 3 kn, Va = 150 mV, ±6 V, MULTISIM 5 kΩ, = 100 mV, ve specify the range of Rffor which the op amp oper- ates within its linear region. R = 5 kN, Re = 25 kN, 250 mV, and Vcc %3D %3| ||

5.14 Refer to the circuit in Fig. 5.11, where the op amp PSPICE is assumed to be ideal. Given that Ra = 3 kn, Va = 150 mV, ±6 V, MULTISIM 5 kΩ, = 100 mV, ve specify the range of Rffor which the op amp oper- ates within its linear region. R = 5 kN, Re = 25 kN, 250 mV, and Vcc %3D %3| ||

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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5.4 The Summing-Amplifier Circuit Figure 5.11 O shows a summing amplifier with three input voltages. The output voltage of a summing amplifier is an inverted, scaled sum of the voltages applied to the input of the amplifier. We can find the relationship between the output voltage v, and the three input voltages, Va, Vb, and ve,using Analysis Method 5.1. O Rf Figure 5.11 A summing amplifier. Ra in •+Vcc Rp R. Va -Vcc Un Vo Vc amp is in its linear region. We then use the ideal op amp voltage constraint in Step 2 together with the ground imposed by the circuit at v, to determine that v, = Vp = 0. In Step 3, we write a KCL equation at the inverting input The summing amplifier has a negative feedback path that includes the resistor Rf, so in Step 1 we assume the op terminal, using Ohm's law to specify the current in each resistor in terms of the voltage across that resistor, to get Un - Vo + in = 0. R1 Un - Vb Un-Ve Un - va R R Re 158 /790
Transcribed Image Text:5.4 The Summing-Amplifier Circuit Figure 5.11 O shows a summing amplifier with three input voltages. The output voltage of a summing amplifier is an inverted, scaled sum of the voltages applied to the input of the amplifier. We can find the relationship between the output voltage v, and the three input voltages, Va, Vb, and ve,using Analysis Method 5.1. O Rf Figure 5.11 A summing amplifier. Ra in •+Vcc Rp R. Va -Vcc Un Vo Vc amp is in its linear region. We then use the ideal op amp voltage constraint in Step 2 together with the ground imposed by the circuit at v, to determine that v, = Vp = 0. In Step 3, we write a KCL equation at the inverting input The summing amplifier has a negative feedback path that includes the resistor Rf, so in Step 1 we assume the op terminal, using Ohm's law to specify the current in each resistor in terms of the voltage across that resistor, to get Un - Vo + in = 0. R1 Un - Vb Un-Ve Un - va R R Re 158 /790
5.13 a) Design an inverting-summing amplifier using a 120 kN resistor in the feedback path so that v, = -(8v, + 5 + 12v.). Use t15 V power supplies. b) Suppose va = 2 V and ve = -1 V. What range of values for v will keep the op amp in its linear operating region? 5.14 Refer to the circuit in Fig. 5.11, where the op amp PSPICE is assumed to be ideal. Given that R 3 kn, MULTISIM R, = 5 kN, %3D Re = 25 kN, 250 mV, and Vcc = ±6 V, Va = 150 mV, %3D 100 mV, ve specify the range of Rffor which the op amp oper- ates within its linear region. %3D 5.15 Design an inverting-summing amplifier so that DESIGN PROBLEM vo = -(8v + 4v + 10ve + 6va). PSPICE MULTISIM Start by choosing a feedback resistor (R) from Appendix H. Then choose single resistors or con- struct resistor networks using resistor values in Appendix H to satisfy the design values for Ra, Rp. Re, and Ra. Draw your final circuit diagram. S.16 a) The op amp in Fig. P5.16 is ideal. Find v, if PSPICE MULTISIM v =4 V, v = 9 V, ve 13 V, and va = 8 V. %3D
Transcribed Image Text:5.13 a) Design an inverting-summing amplifier using a 120 kN resistor in the feedback path so that v, = -(8v, + 5 + 12v.). Use t15 V power supplies. b) Suppose va = 2 V and ve = -1 V. What range of values for v will keep the op amp in its linear operating region? 5.14 Refer to the circuit in Fig. 5.11, where the op amp PSPICE is assumed to be ideal. Given that R 3 kn, MULTISIM R, = 5 kN, %3D Re = 25 kN, 250 mV, and Vcc = ±6 V, Va = 150 mV, %3D 100 mV, ve specify the range of Rffor which the op amp oper- ates within its linear region. %3D 5.15 Design an inverting-summing amplifier so that DESIGN PROBLEM vo = -(8v + 4v + 10ve + 6va). PSPICE MULTISIM Start by choosing a feedback resistor (R) from Appendix H. Then choose single resistors or con- struct resistor networks using resistor values in Appendix H to satisfy the design values for Ra, Rp. Re, and Ra. Draw your final circuit diagram. S.16 a) The op amp in Fig. P5.16 is ideal. Find v, if PSPICE MULTISIM v =4 V, v = 9 V, ve 13 V, and va = 8 V. %3D
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