SECTION 1-2

Op Amp Topologies

Walt Kester, Walt Jung and James Bryant

The previous section examined op amps without regard to their internal circuitry. In this section the two basic op amp topologies—voltage feedback (VFB) and current feedback (CFB)—are discussed in more detail, leading up to a detailed discussion of the actual circuit structures in Section 1-3.

Although not explicitly stated, the previous section focused on the voltage feedback op amp and the related equations. In order to reiterate, the basic voltage feedback op amp is repeated here in Figure 1-12 (without the feedback network) and in Figure 1-13 (with the feedback network).

Figure 1-12 Voltage feedback (VFB) op amp

Figure 1-13 Voltage feedback op amp with feedback ...

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