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Op Amps for Everyone, 3rd Edition by Bruce Carter

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Chapter 4. Single Supply Op Amp Design Techniques
Ron Mancini
4.1. Single Supply versus Dual Supply
The previous chapter assumed that all op amps were powered from dual or split supplies, and this is not the case in today's world of portable, battery powered equipment. When op amps are powered from dual supplies (see Figure 4.1), the supplies are normally equal in magnitude, opposing in polarity, and the center tap of the supplies is connected to ground. Any input sources connected to ground are automatically referenced to the center of the supply voltage, so the output voltage is automatically referenced to ground.
B9781856175050000041/gr1.jpg is missing
Figure 4.1
Split supply op amp circuit. ...

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