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HB tstab randomly giving bad results compared to regular transient

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Spectre version: 23.1.0.403_ISR6

Virtuoso: 23.1.ISR6

*can't upload images for some reason.

While running a harmonic balance configured like this:

1. Run transient - Decide automatically.

2. Run Envelope tstab - no.

3. 1 Tone - fundamental freq. is LO.

11 harmonics.

oversample factor = 4

freqdivide Ration for Tone1 = 1

For random points - tstab outputs wrong results - for example a DC circuit has it's output on the wrong voltage.

while running regular transient (in Cx) I get the right results for all points.

sometimes HB tstab gets it right.

what am I doing wrong?


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