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slide 1010
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5 W/ N. V. W6 e4 n. Z$ e5 HFor a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF. 9 i$ @: q% s- S4 u
The signal bandwidth is determined by RF and not by the circuit gain.3 Z) W( B2 y; t1 a1 P6 s: ~
The circuit gain is independently set with RS.
" K1 J+ f* m; E+ V B6 ?+ x2 yThe signal bandwidth remains stable for all gain settings .
( ~. t" i, Y& D3 u- |Even for unity-gain operation, an RF resistor is required.
" [; ~: Y2 W, X2 k. rThe 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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