Hi

I was trying to model some transistor level circuits in VHDL AMS using Cadence Spectre VHDLAMS.
I have no clue in how to debug the
"Error found by spectre during DC solution estimation, during IC analysis,
       during transient analysis `amsAnalysis'.
   Matrix is singular (detected at `tb_output' and `uInv.A1.irn').  
ncsim:*E, RNALER: simulation terminated due to analog error"

Thanks in advance. your help is awaited.