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slide 10103 C5 w, o* Q1 C o
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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.
, T1 P0 m* Y1 |" }3 nThe signal bandwidth is determined by RF and not by the circuit gain.) Y3 P; t) g" T3 a0 E6 l4 R
The circuit gain is independently set with RS.
# Y* a- w0 V) }* ?; nThe signal bandwidth remains stable for all gain settings .
2 `3 M6 f. z* q! N8 GEven for unity-gain operation, an RF resistor is required.
: n- @ g1 }& _+ A. c3 {7 N. ~6 z* H4 uThe 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.5 z" n* S+ ^3 D0 v/ U$ S( a9 M1 i
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