Op Amp Circuit Question

[Longcircuit]

Hi ,

I'm trying to reverse engineer this opamp circuit . The input is hall effect sensor that measures input current . As i simulate i notice only the top op amp appears to be doing anything while the bottom is saturated at 0. If this is case what's the point of the bottom op amp?

 

[barry]

It looks to me like that's a full-wave rectifier. Did you simulate a bipolar input? Show your simulation.

 

[KlausST]

Hi,

I agree. I also think it´s a full wave rectifier ... followed by some kind of averaging filter.
But really badly designed. A lot of parts and effort for poor performance. Especially when there is a full wave rectifier example in the OP datasheet. Way more simple and with better performance.

Klaus