In the following two circuits, I am using a TLE2426 as a low impedance virtual ground to bias multiple single supply opamps/diff amps. At the output is an LRC filter, but I'm not sure whether to connect the filter capacitor to GND or virtual ground. My gut says that shunting the unwanted signal frequencies to GND directly is better and would keep them off of the virtual ground line, but I'm not sure if this is correct, or if there's really any difference. Performance-wise I can't distinguish a difference. Which of the two options is better?
I believe option 2 is the better one.
Reason being transients being driven out on U2B have a shorter signal path to the ground of the device. If you go with option 1, the transient current need to make their way though the virtual rail driver to ground instead. Obviously a longer path through active devices.
I am however a little surprised there are no capacitors on your virtual ground connecting to the other rails. Various examples on line show some pretty large caps there/