8.1.3 Stability Circuit

For a current-to-voltage design (see Figure 30), the DAC7811 current output (I_OUT) and the connection with the inverting node of the op amp should be as short as possible and according to correct printed circuit board (PCB) layout design practices. For each code change, there is a step function. If the gain bandwidth product (GBP) of the op amp is limited and parasitic capacitance is excessive at the inverting node, then gain peaking is possible. Therefore, for circuit stability, a compensation capacitor C₁ (1pF to 5pF typ) can be added to the design, as shown in Figure 30.

Figure 30. Gain Peaking Prevention Circuit With Compensation Capacitor