Other Parts Discussed in Thread: LMP7711
Hello all.
My application requires to pick up very minute signals from a high output-impedance source, and so the first stage has to be as low-noise as possible. I have been looking for an appropriate amplifier for quite some time now, and the best I could find was OPA141. Unfortunately, it runs on a minimum unipolar supply of 4V5, and my application can provide no more than 3V3. So, I am stuck there, again!
Does TI manufacture any low-noise op-amp with similar, or even better, noise specs and CMMR? I have spent a few days now putting in different parameters into TI's product selector, but could not find anything impressive.
Please note that my application spares me very little space, and since the input impedance is high, the system cannot afford input bias currents of more than 20pA.