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Analysis (stb): phase plots shows reversal i.e. phase plot starting from 0 degree

BitanMallik

Hi,

I am doing stb analysis of an opamp within my circuit.

During schematic simulation (spectre), the phase plot stats from 180 degree and then goes down to 0.

However, extracted netlist simulation, the phase plot stats from 0 degree and then goes up to 90 and falls back.

Is it a simulator issue?! Or does it mean at DC there is a positive feedback?!

Note: Transient response exhibits no positive feedback.

Kindly give your response!

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