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slide 1010
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For a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF.
$ w; [; E; X, o3 j9 yThe signal bandwidth is determined by RF and not by the circuit gain.8 H& x$ o/ o x) q
The circuit gain is independently set with RS.! d' Q4 N; c+ S$ v
The signal bandwidth remains stable for all gain settings .
7 J" h) J9 L/ m' hEven for unity-gain operation, an RF resistor is required.3 }$ S- L. ~4 `7 B& @/ ?
The best practice when designing with CFB op-amps is to use the RF values given in the datasheet and to adjust the desired gain level through RS./ @* Y, r$ Y2 V. s, a" h4 r B, ]
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