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Lesson 16 – OpAmps #1 (Sections 43 and 44) (CLO 42)
There are seven lessons dedicated to OpAmps.
By the end of this module the students should feel
comfortable analyzing and designing OpAmp circuits. The lessons are as follows:
1.
The basics (this lesson).
2. The fundamental building blocks (inverter, noninverter, summer, difference amp).
3. Cascading OpAmps and loading issues.
4. OpAmp Design and Evaluation considerations.
5. OpAmp Applications including Comparators.
6. Instrumentation System Design – Active Transducers.
7. Instrumentation System Design – Passive Transducers.
A good way to begin is with an introduction of why an OpAmp is called an OpAmp (it can
perform mathematical operations like addition, subtraction, scalar multiplication, integration and
differentiation).
It was developed by John Ragazzini of the National Defense Research Council
during WWII to perform mathematical operations needed for the radar systems being developed.
The key to the OpAmp’s success was the use of feedback – the
R
F
studied in previous lessons.
Point out that we use dependent sources to help model the operation of the OpAmp – a nonlinear
device – but in its linear region. A showandtell here is useful. Show off a uA741 OpAmp so that
students can see the scale of the device we are describing. The actual device has dozens of
components inside but fortunately, it can be simply modeled.
Next, draw a picture of an OpAmp circuit diagram and name each of the 5 terminals.
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 Spring '08
 MAURICIODEOLIVERIA

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