I have a prototype circuit that is based around some arbitrary bipolar-supply OpAmp.
It uses "virtual ground" voltage divider so that it can be powered from a 9V battery (hence the "-" of the battery goes to -4.5V rail, the "+" goes to +4.5V rail and the middle point is the "virtual ground").
The requirements evolved such that now I need to add a high-precision OpAmp to one of the stages. However the chip that I will be using is a single-supply chip that would be connected to the "virtual ground" and the +4.5V rail.
Is there any general reason that I should expect degradation in signal quality, now that one of the stages uses the -4.5V rail as negative supply and the new stage uses some internal-to-the-chip negative rail that might be slightly different?
The various datasheets and implementation notes that I have found do not discuss anything of the type.
Here is the single supply opamp datasheet: http://pdf1.alldatasheet.com/datasheet-pdf/view/28867/TI/TLC277.html