In order to intelligently select the correct high speed op amp for a given application, an understanding of the various op amp topologies as well as the tradeoffs between them is required. The two most widely used topologies are voltage feedback (VFB) and current feedback (CFB). An overview of these topologies has been presented in previous tutorials (MT-050, MT-051, MT-052), but the following discussion treats the frequency-related aspects of the two topologies in considerably more detail.
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