I've got a differential signal, however, the negatives are small and intere sting while the positives are large and less interesting (but still importa nt).
Is there an amplifier topology that allows me to set a larger gain for nega tive signals and small gains for positive signals?
Need to be able to measure the 'positive' signals which can be as high as 8
0mV, but I am more interested in the 'negative' signals which are over an o rder of magnitude smaller (typically -2mV at most). Basically, gains that allow me to see the positive signal leave the negatives in the noise, and i f I crank up the gain I see the negatives clearly but the positives are cli pped.I currently handle this with lots of oversampling on the ADC, then in softw are apply gain/scaling so the charts are readable...works just ok (and requ ires a 24-bit ADC I'd like to avoid in the future and stick with 16-bit)... I just can't help but think there is a hardware solution I am missing to ge t better resolution on the negatives.
I realize I'm using 'positive' and 'negative' here arbitrarily, as it is a differential signal like a wheatstone bridge.
Any suggestions?