I'll soon be building a differential amp/buffer using an OP Amp (possibly a OPA1637 or TPH210). I'm a bit rusty but recall that stability can be an issue when feedback is configured for low gain. I'll be aiming for a voltage gain less than unity, more like 1/5th or 1/6th. I don't need the high bandwidth this would normally produce. Less than 60kHz would be OK.

Am I likely to have stability issues? Any pointers to for how to prevent them? Low pass filter in the feedback path?

 

Actually I an idiot. I think if the OP Amp is stable at unity gain it should be stable at less than 1.

 

Actually I an idiot. I think if the OP Amp is stable at unity gain it should be stable at less than 1.

Yes it will, since non-inverting unity gain has the maximum feedback.
Any inverting gain less than one has less feedback than that.

 

Thanks.

I've also just had a look at the data sheet for the THP210 and it explicitly states its stable at unity gain and below.

 

Datasheet gain and phase plots look OK. What are you interfacing that needs sub-zero, balanced gain? There are a lot of precision opamps and inamps with less open loop bandwidth and gain, that might be less finicky.

ak