The OPA210 output buffer provides a balance between fast settling, bandwidth, voltage and current noise, and wide voltage rails. The buffer uses ±15-V voltage rails to make sure there is no voltage clipping. The REF5025 is a low-noise, very low-drift, precise voltage reference and is used to generate a stable 2.5-V reference for this application. To further reduce noise, use a 100-pF capacitor between the non-inverting input pin and the output of the OPA210.