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ch_08_probs

ch_08_probs - CHAPTER Amplifiers and Operational Amplifiers...

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189 CHAPTER 8 Amplifiers and Operational Amplifiers

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190 Chapter 8: Amplifiers and Operational Amplifiers PROBLEMS 8.1 Assume every op-amp is ideal. For the circuit shown below, determine Vo1 and Vo2 in terms of V1 and V2. 8.2 For the circuit shown below, determine Vo in terms of V1 and V2. 6 k + - + - V1 1 k 5 k 1 k 5 k V2 Vo1 Vo2 + - + - V1 V2 Vo 1 k 1 k 1 k 5 k
191 Analog Electronics 8.3 Consider the circuit shown below. (a) Find an expression for Vx in terms of V1 and V2. (b) Find an expression for Vo1 in terms of Vx. (c) Find an expression for Vo2 in terms of Vo1 and V3. (d) Combine the above for your final answer. That is, give Vo2 in terms of V1, V2 and V3. 8.4 In the op-amp circuit below, dtermine Vo vs. V1 and V2. 10 k + - V1 5 k 10 k 1 k 10 k Vo1 Vo2 + - 5 k 2 k V3 Vx + - 2 k 1 k V 2 Vo 10 k 1 k + - 1 k V 2 + - V 1 4 k

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192 Chapter 8: Amplifiers and Operational Amplifiers 8.5 Consider the op-amp circuit shown below. First, find the val- ues of Rf and Ra such that V0 = -3V1 + 13V2. Then, using these values and given that V1 = 3V and V2 = 1V, find the cur- rent Io flowing into the op-amp. 8.6 Consider the Op-amp circuit shown below. The Op-amp is ideal and in its linear range. Find the expression fro Vo vs. Vi. Vo Rf 1 k 15 k Io 10 k + - + - V 2 V1 Ra Vo 1 k 2 k 5 k 3 k + - + - 5V Vi 4 k
193 Analog Electronics 8.7 The Op-amp in the circuit below is ideal (a) What is the name of this type of circuit. What is the general expression for Vo vs V+ and V- if the gain A of the op-amp is 100,000. (b) Determine Vo when: V1 = 1.1V and V2 = 1.0V (c) Determine Vo when: V1 = 1.0V and V2 = 1.1V 8.8 Consider the Op-amp circuit shown below. The Op-amps are ideal and in their linear range. Find the expression for Vo vs.

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