Ive created two PCBs, a power board to output a +-5V supply and a midway voltage reference (using the TLE2426) at 0V. This PCB powers a biosignal acquistion board shown in the spice diagram below.
The amplifier is an INA129 and the rest of the op amps are AD822ARZ. The power board does exactly as its meant to do, it supplies the board with +-5V and a midway reference voltage for the INA129, however there is almost a 1.3V difference between my floating virtual ground outputted from my power board and my ground plane on my biosignal board.
The V- and V+ are -+5V with reference to the Vref but are +1.3V and -8.7V when measured from the ground plane in my biosignal board, is there anyway to correct/explain this?