cmc
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Hi Gavi, thanks for your input. Unfortunately, only PSS takes autonomous oscillation as an input.
My intuitive solution is to do a PSS without the external signal to obtain the oscillation frequency, then add another very small signal sinusoidal input at that frequency to some reasonably insensitive node. Then run QPSS using the external source and the new small signal source as inputs. One potential problem here is frequency shifts - pushing/pulling - due to the effect of the external source making the frequency of the new signal source inaccurate, so I'm not entirely satisfied with the solution.
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