Figure 8-9 shows a noninverting amplifier that reduces peaking at low gains. Resistor R_C compensates the OPA830 to have greater noise gain (NG), which reduces the ac response peaking (typically 5dB at G = +1 without R_C) without changing the dc gain. V_IN must be a low impedance source, such as an op amp. The resistor values are low to reduce noise. Using both R_T and R_F helps minimize the impact of parasitic impedances.

The noise gain is calculated as follows:

A unity-gain buffer can be designed by selecting R_T = R_F = 20.0Ω and R_C = 40.2Ω (do not use R_G). This configuration gives a noise gain of 2, so the response is similar to the characteristics plots with G = +2. Decreasing R_C to 20.0Ω increases the noise gain to 3, which typically gives a flat frequency response, but with less bandwidth.

The circuit in Figure 8-1 can be redesigned to have less peaking by increasing the noise gain to 3. This redesign is accomplished by adding R_C = 2.55kΩ across the op amp inputs.