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RCC post layout simulation problem

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pbs681

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Hi all,

Currently I am simulating my opamp loop gain char by using stb analysis. The simulation results looks good for pre-layout simulation and also post layout simulation extracted CC. The problem happen when I use RCC, RC and R extractiion netlist for the post layout simulation. The phase at low freq seems to have almost 180 deg difference with pre layout simulation. Gradually, as freq increases, the phase plot will follow pre-layout simulation plot closely. Can anybody help me on this. Appreciate ur help.
 

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