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lesson19 - It is good for the students to see alternate...

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Lesson 19 – Op-Amps #4 (Section 4-5) (CLO 4-3) This lesson focuses on Op-Amp design and evaluation. Since there are often several ways to achieve a particular design – especially with Op Amps – it is useful to dedicate a lesson to helping students understand what to consider when designing circuits . Start by having students design a circuit to implement the following input-output relationship V 3 18 6 2 1 O + - = v v v Tell them to create first a block diagram of the task. Then have the students decide which Op-Amp building blocks to use. Since the summer is also an inverter, we will need to consider those. In general, signals like v 1 and v 2 cannot be inverted by simply inverting the source, however, the bias voltage like the 3 V in this exercise can. So there are two approaches both shown here. These are quite similar and there is no real advantage of one over the other except if there is no negative 3 V available.
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Unformatted text preview: It is good for the students to see alternate approaches and how a block diagram can be rearranged to achieve the same end. You can ask the students to draw the block diagram of approach (b). Another similar problem asks students to determine if the second simpler circuit really does everything that the more complex circuit does. This requires students to analyze both circuits and make a decision. Although this is a very easy problem, it does point out that complex circuits can often be significantly simplified and still perform the same task. Both circuits produce 1 O 1 11 v v .-= . v 1 v 2 v O 6 18 3 V (a) v O V 1 180 k Ω-3 V 10 k Ω 10 k Ω 10 k Ω v 2 180 k Ω 30 k Ω (b) v O V 1 180 k Ω 3 V 60 k Ω 10 k Ω 10 k Ω v 2 180 k Ω 60 k Ω O 1 k Ω v 1 v 10 k Ω 10 k Ω 1 k Ω 10 k Ω 9 k Ω 1 v 100 k Ω O v (a) (b)...
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