Electronic Circuits with MATLAB, PSpice, and Smith Chart

5OP Amp Circuits

CHAPTER OUTLINE

1. 5.1 OP Amp Basics ^[Y-1]
2. 5.2 OP Amp Circuits with Resistors ^[Y-1]
   1. 5.2.1 OP Amp Circuits with Negative Feedback
   2. 5.2.2 OP Amp Circuits with Positive Feedback
3. 5.3 First‐Order OP Amp Circuits ^[Y-1]
   1. 5.3.1 First‐Order OP Amp Circuits with Negative Feedback
   2. 5.3.2 First‐Order OP Amp Circuits with Positive Feedback
   3. 5.3.3 555 Timer Using OP Amp as Comparator
4. 5.4 Second‐Order OP Amp Circuits ^[Y-1]
   1. 5.4.1 MFB (Multi‐FeedBack) Topology
   2. 5.4.2 Sallen‐Key Topology
5. 5.5 Active Filter ^[Y-1]
   1. 5.5.1 First‐Order Active Filter
   2. 5.5.2 Second‐Order Active LPF/HPF
   3. 5.5.3 Second‐Order Active BPF
   4. 5.5.4 Second‐Order Active BSF
6. Problems

The operational amplifier (OP Amp) is probably the most versatile analog chip available. It was originally designed to be used for analog computers that perform mathematical operations such as addition, subtraction, integration, and differentiation. As it was widely used for many other applications, early OP Amps constructed from discrete components (such as vacuum tubes and then transistors and resistors) have been superseded by integrated‐circuit (IC) OP Amps made up of a large number of transistors, resistors, and (sometimes) one capacitor. With only a few external components, it can be made to perform a wide variety of analog signal processing tasks. One of the most common and famous OP Amps is the μA741, which was introduced by Fairchild in 1968 and is now available at less than a dollar.

(Note) A handbook of OP Amp applications ...