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slide 1010, n3 ]/ d: A* q, a. k
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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.
9 C) G* Z& `1 d! x* TThe signal bandwidth is determined by RF and not by the circuit gain.
p1 [4 Q0 o0 k5 W' zThe circuit gain is independently set with RS.
3 B: ~: k* P+ {5 W; o$ ?The signal bandwidth remains stable for all gain settings .
4 g5 h( ]' [6 |" J& H* bEven for unity-gain operation, an RF resistor is required.
6 Q5 u4 |# s/ }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.
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