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OPERATIONAL AMPLIFIERS
Figure 3-11.Block diagram of an operational amplifier

Neets Module 08-Introduction to Amplifiers
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3-16 1.     Very high gain 2.     Very high input impedance 3.     Very low output impedance Figure 3-10A.—Schematic symbols of an operational amplifier. Figure 3-10B.—Schematic symbols of an operational amplifier. Since no single amplifier stage can provide all these characteristics well enough to be considered an operational amplifier, various amplifier stages are connected together. The total circuit made up of these individual stages is called an operational amplifier. This circuit (the operational amplifier) can be made up of individual components (transistors, resistors, capacitors, etc.), but the most common form of the operational amplifier is an integrated circuit. The integrated circuit (chip) will contain the various stages of the operational amplifier and can be treated and used as if it were a single stage. BLOCK DIAGRAM OF AN OPERATIONAL AMPLIFIER Figure 3-11 is a block diagram of an operational amplifier. Notice that there are three stages within the operational amplifier.






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