Interpreting passive filter phase response extending beyond -180 degrees in LTSpice

Thread Starter

SiCEngineer

Joined May 22, 2019
390
Hello!

When conducting AC analysis on a passive LC low-pass filter, or any filter actually, what does it mean when the phase response extends beyond -180 degrees? I have read online that using "Phase wrapping" alleviates the issue. I am having difficulty interpreting the stability of the filter.

Note though that the additional filter at 1MHz is intentionally there. Although the shape of the response of that filter looks OK and as expected in both phase and gain, I am still confused about the phase being more than -400 degrees. Bode plots is something I have notoriously struggled with.

Best,
SiC

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