This will be a conceptual question. I'm sometimes dealing with data-acquisition of transducers, like strain gauges, accelerometers ect. sort of sensors.
Most of these sensors have their own precision amplifiers. So what I mean by the transducer output is the amplified sensor signal.
These signals then go to data-acquisition's input amplifier which is simply a differential amplifier ect.
But most of the time the transducer outputs are single ended.
Sometimes I encounter all sorts of noise, common mode noise ect.
Since differential signalling is more immune to noise, I thought about converting a single ended signalling to a differential signalling as below(I want to implement Figure 2):
So here are my questions.
1-) Some transducers are manufactured and sold as differential signalling transducers. So they are ready to be wired to a differential amplifier.
But if one has a transducer and want to use it as differential signalling as in my Figure 2, would that be a wrong treatment?
Im asking because If I invert the signal myself to obtain a differential signalling as in Figure 2, then I might introduce noise to the inverted input by interacting it with the inverting opAmp circuit,
and that will not be common on both signals.
So my first question is: is it a common practice to convert single ended signalling to differential ended signalling(in the aim of noise immunity) where the transducer was actually designed for single ended signalling?
2-) If this method makes sense. Here is the typical inverting opAmp configuration:
I would choose R1 and R2 10k. How does the input impedance of the data-acquisition's differential amplifier have affect on choosing R1 and R2 here?
I want the inverting as precise as possible. Is there an opAmp category for that, an example would be great? I dont want use LM741 for instance.