I created guideline for .bode. Note that the perturbation signal amplitude often needs to vary depending on the scenario. As a rule of thumb, the signal should be large enough to generate measurable input/output responses, but small enough to maintain small-signal loop operation. In fact, you often need different amplitudes across different frequencies. My guide explains how to set this up.
Frequency Response Analysis (.bode) Study Guide - QSPICE - Qorvo Tech Forum
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