TABLE OF CONTENTS Marc Thompson
| Note | In this chapter, Marc shows us an example of a real op-amp as well as how to analyze it and use it. This is not a perfect op-amp, but what op-amp is? Answer: None. But this one would be usable. (I've seen worse.) The main point is, how do we apply an op-amp even if it is not perfect? In a real-life application where the capacitive load is not perfect. /rap |
The basic operational amplifier is discussed from a topological point of view. A step-by-step case study illustrates the basic building blocks in a monolithic op-amp. At the end of this chapter we'll consider some of the real-world limitations of operational amplifiers.
The ideal operational amplifier ( Figure 3-1) has the following characteristics:
Differential inputs. The output is an amplified version of the difference between the +and ?terminals.
Infinite gain. The gain is infinite.
Infinite bandwidth. There are no bandwidth limitations.
Infinite slew rate. There is no limit to the rate with which the output can change. In other words, there is no limit to dV out/dt.
Zero input current. The input current to both inputs is zero.
Zero output impedance. The output impedance is zero.
Zero power dissipation. The ideal op-amp doesn't draw or dissipate any power.
Infinite power supply rejection. The output is not dependent on variations in power supply voltage.
Infinite common-mode signal rejection. The...
