Hello all, I have a cct (fairly simple and small) that I am simulating in Spectre. I can push the simulation parameter iabstol to 1e-15, but no less. When, I set iabstol to 1e-16 or less, my DC, tran and noise simulations have convergence problems. Unfortunately, I need a better accuracy than that, in the neighborhood of 50e-18A (or less). How can the simulator to run with an iabstol smaller than 1e-15? Other simulator parameters are : reltol= 1e-6 vabstol= 1e-6 gmin=1e-18 The first 2 parameters have been varied, but alas, these variations do not permit the simulator to accept an iabstol of less than 1e-15. Any help will be appreciated Thank you. Regards, -Roger