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slide 1010
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9 K w% D& x. [0 b) LFor a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF.
/ q2 T# p9 x j. J- BThe signal bandwidth is determined by RF and not by the circuit gain.
4 w: R* s: m G |& nThe circuit gain is independently set with RS.
8 C7 }5 O7 x- j% {The signal bandwidth remains stable for all gain settings .$ ]6 Y3 @6 ]& B, w8 n, X: M' X% m
Even for unity-gain operation, an RF resistor is required.
9 Z6 b& c# L! P$ b7 \9 C0 gThe 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.
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