Active RC Filters Using Current-Feedback Amplifiers
This chapter is devoted to simplified design of active RC filters using current-feedback amplifiers or CFAs (sometimes called Norton amplifiers). CFAs are similar to op amps, but are closer to OTAs (operational transconductance amplifiers) because the CFA 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 op amps. For a thorough but dull discussion of CFAs, read the author’s Simplified Design of IC Amplifiers (Butterworth-Heinemann).
9.1 Basic CFA Operation
With a CFA, there is no separate pin for control current. Any change in amplifier characteristics is set by current ...
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