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current feedback or voltage feedback

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surianova

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hi all!

may i know current feedback is faster or voltage feedback and why?
 

current feedback is faster . For detail please refer to a book written by palumo & peninsi
 

In general, one can say that current feedack amps are faster (although there are voltage feedback amps on the market with a current feedback architecture and with the same speed).

The reason is that CFA´s must NOT be universal compensated. Nevertheless, they can be operated with each resistive divider in the feedback path, provided the resistor between output and neg. input is larger than a minimum specified value (in the region of 500 ohms...1kohm). Therefore, pure capacitive feedback as in integrating circuits is NOT allowed.
 

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