To assess the closed-loop behavior of the compensated OPA593 in the current booster configuration, a small signal step transient analysis was performed, as shown in Figure 5-5. The closed-loop transient response reveals no overshoot or oscillation, indicating a sufficient phase margin and effective compensation applied to the inner and outer feedback loops.

Figure 5-5 Compensated Composite Amplifier - Step Transient Response in Time Domain

Like the emulated power amplifier in Section 4, gain peaking or Q effects can be more pronounced in actual op-amp simulations. Each op-amp design contains numerous hidden poles and zeros. While these high frequency poles and zeros typically do not interfere with single feedback loop compensation within the UGBW, the DFC compensation methods can be an exception, particularly when managing multiple feedback loops. Thus, it is crucial to examine the AC frequency response behavior, to verify sweep frequency response in ATE applications, as shown in Figure 5-6.

Figure 5-6 OPA593 and Current Booster's Effective Bandwidth: AC Sweep in Frequency Domain