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Is this opamp stable ?

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MahmoudHassan

MahmoudHassan

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Hello again
Iam sharing my results for my first OTA results
the problem that phase diagram starts from +180 and I was thinking that phase should start from 0 degree - how can I fix that ?
my 2nd question Is this opamp stable ?
first two points for gain and phase and 2nd points for phase at zero gain
the opamp is stabilized with miller compensation of 2pF and load capacitance also 2pF
and there is no feedback other than this

IS this opamp stable.png
 

It would be helpful to see - at least - a kind of block diagram for the simulation arrangement.
What is shown? Loop gain? Open-loop gain?
If the input signal is connected to the inverting input terminal the phase will start at 180eg.
Your simulation results reveal a negative phase margin
 

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