I have an application that requires very long term DC stability. Upon looking into some choppers, I've found the datasheet for the OPA188 shows a slight rise in the voltage noise that looks to continue off the graph. TINA-TI simulation also shows the noise continually rising in a "1/f fashion" at very low frequencies.
I haven't run into any other choppers that exhibit 1/f nosie, so I'm afraid I may be discounting the OPA188 for no real reason. Before I get too far down the road, I'd like to verify if the OPA188 exhibits a real-life continual rise in low frequency noise.