Here is the data that was taken last week on the driver circuit.
At first there was a LF356 chip instead of the AD743, and it gave the following response:

Which looked reasonable, but it made sense to take noise measurements using 2 AD743s so I swapped it out, but then the response was this:

For some reason, the cutoff frequency moved to close to 100Hz. The noise measurement was:

I also tried replacing the 10uF capacitors with 22uF capacitors to try to move the cutoff frequency back down, and got the following response:

So that worked, but then the noise measurement went up by a lot:

I'm not sure what the noise requirements are, but it looks like using 10uF caps gives a pretty high cutoff frequency, but using 22uF caps increases the noise.
I also put in the BUF634 chip but when I powered it, I smelled something burning, so I'm going to test out that chip in isolation before trying to integrate it with the rest of the circuit.
Edit (11/17/2016): Attached Matlab workspace with relevant data, plotting script, and Andrew's freqStich script (used to combine noise measurements). |