Abstract: A method and a system for validating initial conditions (ICs) generally provided by a user when simulating a VLSI circuit are described. Inconsistent ICs sets are detected and replaced by consistent subsets thereof. The method selects the resistance and source values in a Norton or Thevenin circuit used to enforce the IC, and detects when specified ICs are inconsistent while preserving critical or fragile ICs when a two DC-pass approach is used. It further correlates the set of consistent ICs thus obtained with an equivalent circuit and simultaneously provides an input for future use. This allows a user to be notified and given a measure of how bad the inconsistencies are. Detecting inconsistencies is achieved either by measuring the holding current or by measuring the voltage drift if the two DC-pass approach is used.

Abstract: A process for obtaining accurate DC convergence in a DC phase of a circuit simulation program for models of field effect transistors (FETs) on a silicon-on-insulator (SOI) substrate. The process comprises running iterations of the DC phase of the circuit simulation program such that error criteria are satisfied, wherein the pseudo-time step changes at each iteration until it reaches a value such that a desired current value is achieved. DC convergence is also achieved by reducing the magnitude of the capacitive and/or charge elements connected to the floating body regions of the field effect transistors on the silicon-on-insulator substrate model during the DC phase to achieve a desired current value.

Abstract: Tufted carpeting has a unitary primary backing comprising a woven synthetic scrim with a backing layer of staple fibers needled onto its back surface before tufting. The tuft bases are at least partially surrounded by the fibers of the backing layer, and sizing is applied to the underside of the carpet after tufting. The resulting product has excellent dimensional stability, stiffness and flame retardance, and requires no secondary backing. In the preferred embodiment, the staple fibers are needled through the scrim to provide, in addition to the backing layer, a dyeable subface on the face side.