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slide 1010
, I! _: z, D; V4 {3 U8 ]- x' `2 l, r7 P
For a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF. , z4 M L+ y4 f% ?. G
The signal bandwidth is determined by RF and not by the circuit gain.2 [; V6 Y" {( a$ M. g
The circuit gain is independently set with RS.
& `6 p3 {, _7 pThe signal bandwidth remains stable for all gain settings .( n7 K2 O, {- A+ s
Even for unity-gain operation, an RF resistor is required.8 Z y9 r6 A) I! n# U
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.4 [$ ~" P, N% K3 }$ I7 Z
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