I recall having seen a rather simple circuit with 2 opamps (IIRC) which could switch from inverting to non-inverting operation by means of switching a single transistor or FET on and off -- but I can't find it anywhere anymore.
For a particular type of ramp generator, I need to switch electronically between two voltages, mirrored around a reference voltage of 1.25V -- e.g.1.0V and 1.5V, or 0.7V and 1.8V etcetera.
Sure, I can build a simple opamp inverter with 1.25V at its + input, and use a 4053 two-channel multiplexer gate to switch between the input and output voltages, but that seems like a bit of waste in terms of devices and PCB space.
Can anyone remember how this was done? Thanks already for any suggestions.