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Simulators >> AMS Simulators >> Debugging Analog Erros in Spectre-NCSIM
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Message started by badamsssl on Feb 26^th, 2007, 7:32pm

Title: Debugging Analog Erros in Spectre-NCSIM
Post by badamsssl on Feb 26^th, 2007, 7:32pm

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.

Title: Re: Debugging Analog Erros in Spectre-NCSIM
Post by Ken Kundert on Mar 27^th, 2009, 11:26am

Look for floating nodes, particularly `tb_output' and `uInv.A1.irn'. Once you find them, add a large value resistor from that node to ground.

-Ken