Inverting summing amplifier

Summing inverting amplifier

Vout = -R4*(Vin1/R1+Vin2/R2+Vin3/R3)

R5 = R1||R2||R3||R4 for minimum offset error due input bias current

Note: it’s not possible to get┬ásumming without amplification (gain = 1) with the inverting schematic, which could be easily achieved when using non-inverting summing setup.

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