Current-Feedback Amplifier Design

This chapter is devoted to simplified design with current-feedback amplifiers, sometimes called Norton amplifiers, CFAs, or CFBs, depending on which literature you read. We will call them CFAs for simplicity. CFAs are similar to OTAs (Chapter 4) in that their characteristics are controlled by an external current or voltage. However, the internal circuits and functions of CFAs are quite different from those of OTAs (and from op-amps).

With a CFA, there is no separate pin for control current. Any change in amplifier characteristics is set by current that is applied at the (+) noninverting and (–) inverting inputs. Some (but not all) manufacturers use a modified amplifier symbol such as shown in Fig. ...

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