The small-signal step transient simulation plot confirms that the DFC is stable in the closed loop, as shown in Figure 4-6. There is no output overshoot, and the design meets the timing requirements outlined in Table 4-2.

Figure 4-6 The Compensated Closed-Loop Response: Step Transient Analysis in Driving 1μF Load

The final validation step in the simulation involves a frequency sweep of the OPA593 with the current booster and analyzing the gain responses, as shown in Figure 4-7. If the AC gains increase with frequency near the -3dB point, it typically suggests that two poles are too closely spaced or overlapped. This phenomenon is discussed in the next section.

Figure 4-7 AC Frequency Sweep of the Emulated PA Driving 1μF Load