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Stabilizing Current-Feedback Amps

 

Optimizing a circuit design with a current-feedback (CFB) op amp is a relatively straightforward task, once one understands how CFB op amps achieve stability. This application note explains a 2nd-order CFB model so that any designer can better understand the flexibility of the CFB op amp. This report also discusses stability analysis, the effects of parasitic components due to PCBs, optimization of noise components, and changing the feedback resistor while maintaining amplifier performance and stability. Numerous other topics pertaining to CFBs are also addressed with detailed examples.