Suppose you have to amplify a signal with a gain of 2 . The signal is referenced to ground, which means V1 is zero. Is there any reason why one would use this circuit below instead of a normal non-inverting amplifier. https://www.electronicshub.org/differential-amplifier/ Picture obtained from https://www.electronicshub.org/differential-amplifier/

So in that case what is the difference between this circuit and the "normal" non-inverting amplifier were R2=zero and R4= removed. The only difference I see, is that with the differential amplifier you are able to achieve a gain less than 1. Are there any more reasons?accuracy?etc

  • \$\begingroup\$ No - I don`t think that there are any other reasons for using such a voltage divider... \$\endgroup\$ – LvW Nov 4 '19 at 11:01
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    \$\begingroup\$ The differential input is useful if the ground of the source and the amplifier are not identical - it can reject ground noise and avoid causing a ground loop. \$\endgroup\$ – Kevin White Nov 4 '19 at 15:27

The beauty of that 4-resistor circuit is the flexibility of centering Vout to whatever you wish, done by unGrounding that R4 and biasing to your desired Vout_center.

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  • \$\begingroup\$ Ohh yes...this may make sense for single supply systems. \$\endgroup\$ – LvW Nov 4 '19 at 14:04

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