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Could you explain the conclusion in more detail?Kral said:The inverting configuration has lower bandwidth because the feedback factor is smaller.
Let
. Rf = Feedback Resistor
. Ri = Input resitor for Inv configuration, Resistor to ground in Non-Inv configuration.
. a = feedback factor (fraction of the output that is fed back to the input).
.
For the Inverting configuration,
. Rf = 2 Ri
. a = Ri/(Rf + Ri) = Ri/(2Ri+Ri) = Ri/3Ri = 1/3
For the Non-Inverting configuration
. Rf = Ri
. a = Ri/(Rf + Ri) = Ri/(2Ri) = 1/2
.
At any frequency (above DC), the gain error due to limited open loop bandwidth will be higher for the inverting configuration than for the non-inverting configuration.
Regards,
Kral
Kral said:The inverting configuration has lower bandwidth because the feedback factor is smaller.
Let
. Rf = Feedback Resistor
. Ri = Input resitor for Inv configuration, Resistor to ground in Non-Inv configuration.
. a = feedback factor (fraction of the output that is fed back to the input).
.
For the Inverting configuration,
. Rf = 2 Ri
. a = Ri/(Rf + Ri) = Ri/(2Ri+Ri) = Ri/3Ri = 1/3
For the Non-Inverting configuration
. Rf = Ri
. a = Ri/(Rf + Ri) = Ri/(2Ri) = 1/2
.
At any frequency (above DC), the gain error due to limited open loop bandwidth will be higher for the inverting configuration than for the non-inverting configuration.
Regards,
Kral