I've been working on a design for a filter for a resitor bridge, and I've been considering a synchronous demodulator and a square wave for driving the bridge. However, I need to design it on a single supply. The AD630 uses a dual supply, and I've pretty much design the +/- amplifier like the AD603. However, in a single supply design, for the inverting amplifier, the offset voltage gets multiplied by the gain:
Vout = -G(Vin - V+) + V+
Has anyone heard of any methods arround this?