This absolute value amplifier has a gain of 0.5V/V and has an input range of within a few mV of -5V to +5V. A buffer amplifier should be used on the output to prevent loading. For a faster amplifier, use an OPA354.
The rail- to- rail input and output characteristics of these CMOS op amps allow them to swing very close to their supply rails– +5V and ground. By using both an inverting and noninverting amplifier to swing only positive (due to their not being capable of swinging below ground) , each op amp acts like a perfect rectifier. Summing their outputs together in R3 & R4 combines them into an absolute value of the amplifier’s input voltage. (Circuit created by Neil P. Albaugh, TI-Tucson)
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