I need a half-rail virtual ground in a 3.3 volt circuit. I couldn't find anything like a TLE2426 that would work at that voltage so I thought I would use a low-voltage opamp configured as a follower with VCC/2 connected to the positive input. The TI LMV721 has a supply voltage range of 2.2 to
5.5 volts and a GBW of 10 MHz. That would be probably be acceptable but I would like to extend the range of low impedance output to as high a frequency as possible and so perhaps a cap on the output would be helpful. The data sheet implies that the '721 is stable with 2.1 nF on it's output with a 2.2 V supply and 21 nF at 5 volts, but doesn't state a maximum value of capacitive load. Linear extrapolation would imply that 9.5 nF would be OK at 3.3 volts. Any idea wha the actual maximum value might be?Also, my circuit will not impose a DC load on the virtual ground; should there some DC load on the opamp?