Although most end applications use a single-supply implementation, most characterizations are done on a bipolar balanced supply. Using a bipolar balanced supply keeps the I/O common-mode inputs near midsupply and provides the most output swing with no DC bias currents for level shifting. These characterizations include the frequency response, harmonic distortion, and noise plots. The time domain plots are in some cases done through single-supply characterization to obtain the correct movement of the input common-mode voltage.