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SPECTRE RF convergence error pss analysis in an N-path filter combiner design

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Alipoursaadaty

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Hi everyone
I'm designing a wideband receiver with N-path filters.
At the last stage we must use combiner to collect the voltages on the capacitors.
I have designed combiner with 3-stage inverters. To work properly, I added resistor feedback between first and last stage.
But when I run pss analysis, I get convergence error. Without resistor feedback, there is no problem. but when I add the resistor feedback, I get this convergence error:
3.jpg1.jpg2.jpg
 

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