Oznog
Active Member
I have a couple of silicon strain gauge pressure sensors which are inherently quite noisy (500Hz - MHz range), but I must have a high accuracy reading out of a 16 bit op amp. Oversampling was not helpful enough, so I need to construct a lowpass filter, but the ADC will have an unacceptable loss of accuracy with the high source impedance.
So, I need to add a 1:1 buffer after the filter. It needs to be as low offset as possible, as well as low noise since the whole point is to lower the noise.
It's powered by a single 5v supply and the signal on one sensor swings to 4.1, but the other can swing to 4.95v, which may mean I need to select another sensor since fewer buffers can go rail-to-rail in 5v (voltage dividers are bad for accuracy so I will be staying away). Power output and supply current are not an issue.
Any recommendations? There's just a crapload of op amps out there and I'm going to looking through specs for awhile.
So, I need to add a 1:1 buffer after the filter. It needs to be as low offset as possible, as well as low noise since the whole point is to lower the noise.
It's powered by a single 5v supply and the signal on one sensor swings to 4.1, but the other can swing to 4.95v, which may mean I need to select another sensor since fewer buffers can go rail-to-rail in 5v (voltage dividers are bad for accuracy so I will be staying away). Power output and supply current are not an issue.
Any recommendations? There's just a crapload of op amps out there and I'm going to looking through specs for awhile.