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slide 1010
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, Z! B; `/ p7 S: x. l8 KFor a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF.
2 H# m& D. S6 @The signal bandwidth is determined by RF and not by the circuit gain.
; ^& j+ Y7 k1 G. K. T3 iThe circuit gain is independently set with RS.3 u; ^1 c6 |5 w5 I7 x
The signal bandwidth remains stable for all gain settings .
, S' C3 J" B `) B$ kEven for unity-gain operation, an RF resistor is required.
1 O1 W1 X4 k$ A% h0 mThe 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.# h" G9 W# C) Z8 N6 C; ]
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