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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.
8 O+ N# K9 E3 X) I# H1 w2 SThe signal bandwidth is determined by RF and not by the circuit gain.
. J, ?1 i! O: k2 m) ~The circuit gain is independently set with RS.
9 \8 n# w d# dThe signal bandwidth remains stable for all gain settings .
; f8 z3 J/ D$ mEven for unity-gain operation, an RF resistor is required.
( S" h! L( i( o0 ]# s; VThe 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.1 {+ Y; ?/ M7 k7 Z8 a% b
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