Steven D Walker

US Patent:

7519526, Apr 14, 2009

Filed:

Feb 16, 2006

Appl. No.:

11/355342

Inventors:

Emrah Acar - Montvale NJ, US
Bhavna Agrawal - Ennetbaden, CH
Peter Feldmann - New York NY, US
Ying Liu - Austin TX, US
Steven G. Walker - Pleasantville NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/50

US Classification:

703 14

Abstract:

A solution for analyzing a circuit using initial charge information is provided. In particular, one or more nodes in a design for the circuit is initialized with an initial charge. The charge can comprise a non-equilibrium charge, thereby simulating the history effect, the impact of a charged particle, electro-static discharge (ESD), and/or the like. Operation of the circuit is then simulated over the set of input cycles based on the initial charge(s). To this extent, the non-equilibrium initial condition solution enables the state of the circuit to be controlled and solves the initial system based on these values. This capability is very useful to condition the circuit at a worst-case, best-case, and/or the like, status. Further, in one embodiment of the invention, a set of equations are provided to implement the non-equilibrium initial charge analysis, which provide a more efficient initialization of the circuit than current solutions.

US Patent:

8290760, Oct 16, 2012

Filed:

Jun 27, 2008

Appl. No.:

12/163318

Inventors:

Emrah Acar - Montvale NJ, US
Bhavna Agrawal - Ennetbaden, CH
Peter Feldmann - New York NY, US
Ying Liu - Austin TX, US
Steven G. Walker - Pleasantville NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/50

US Classification:

703 14, 703 2

Abstract:

A solution for analyzing a circuit using initial charge information is provided. In particular, one or more nodes in a design for the circuit is initialized with an initial charge. The charge can comprise a non-equilibrium charge, thereby simulating the history effect, the impact of a charged particle, electro-static discharge (ESD), and/or the like. Operation of the circuit is then simulated over a set of input cycles based on the initial charge(s). To this extent, the non-equilibrium initial condition solution enables the state of the circuit to be controlled and solves the initial system based on these values. This capability is very useful to condition the circuit at a worst-case, best-case, and/or the like, status. Further, in one embodiment of the invention, a set of equations are provided to implement the non-equilibrium initial charge analysis, which provide a more efficient initialization of the circuit than current solutions.