Peter Feldmann, Age 65181 90Th St, New York, NY 10128

7006931, Feb 28, 2006

Feb 11, 2004

10/776716

Alina Deutsch - Chappaqua NY, US
Peter Feldmann - New York NY, US
Albert E. Ruehli - Chappaqua NY, US
Howard Harold Smith - Beacon NY, US

International Business Machines Corporation - Armonk NY

G01R 15/00

702 57, 333116

A system and method for analyzing a circuit with transmission lines includes determining which sources influence each of a plurality of transmission lines, based on coupling factors. Transmission line parameters are computed based on the sources, which influence each transmission line. A transient response or frequency response is analyzed for each transmission line by segmenting each line to perform an analysis on that line. The step of analyzing is repeated using waveforms determined in a previous iteration until convergence to a resultant waveform has occurred.

7350170, Mar 25, 2008

Jun 1, 2005

11/142709

Bhavna Agrawal - Ennetbaden, CH
Peter Feldmann - New York NY, US
Sani R. Nassif - Austin TX, US
Tomasz J. Nowicki - Briarcliff Manor NY, US
Grzegorz Michal Swirszcz - Ossining NY, US

International Business Machines Corporation - Armonk NY

G06F 17/50

716 6, 716 5

A system and method for analyzing a memory element includes modeling the memory element using a simulation method and determining component response characteristics for components of the memory element. Safety regions are computed in a state space of the memory element, which indicate stable states. A transient analysis is performed to determine a path and time needed to reach one of the safety regions. Based on the path and time needed to reach one of the safety regions, a clock waveform or waveforms are determined which place a corresponding state in that safety region.

7418370, Aug 26, 2008

Mar 31, 2004

10/815432

Peter Feldmann - New York NY, US
Jason D. Morsey - Hopewell Junction NY, US
Barry J. Rubin - Croton-on-Hudson NY, US

International Business Machines Corporation - Armonk NY

G06F 7/60
G06G 7/48
G02N 15/08
G01F 1/00
G01R 15/00

703 2, 703 6, 702 12, 702 48, 702 57

This invention relates to computing numerical solutions of linear systems of equations, specifically to implementing preconditioning of the coefficient matrix of such a system. The preconditioning applies to any coefficient matrix, dense or sparse, based on the solutions of a physical problem of unknown functions, commonly referred to as basis or interpolation functions, where the basis function spans more then one mesh element. Examples of such linear systems can result from, as examples, an electromagnetic analysis of printed circuit boards or field scattering in radar applications, fluid mechanics and acoustics. A method and system to compute a preconditioner for a coefficient matrix A that is compatible with the linear system of equations that provides basis function support over at least two mesh elements. Coupling of the preconditioner between partitions of a portioned mesh representation is only through basis functions at the partition boundaries.

7519526, Apr 14, 2009

Feb 16, 2006

11/355342

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

International Business Machines Corporation - Armonk NY

G06F 17/50

703 14

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.

7788617, Aug 31, 2010

Mar 6, 2008

12/043455

Adil Bhanji - Wappingers Falls NY, US
Soroush Abbaspour - Fishkill NY, US
Peter Feldmann - New York NY, US
Debjit Sinha - Wappingers Falls NY, US

International Business Machines Corporation - Armonk NY

G06F 17/50

716 6, 716 1, 716 2, 716 3, 716 4, 716 5, 703 13, 703 14

An accurate method to compute the capacitance at a pin whose capacitance is slew dependant. The method uses existing library characterized data and provides an equation based approach which can easily be integrated in static timing analysis without the added resource needs that an iterative approach would require. An RC/RLC network from slew and output load dependent pin capacitance tables is generated. The resulting linear network which models the pin capacitance is then stitched to the original interconnect network and used to calculate the propagation delay across a gate and corresponding interconnect. The method steps include: a) determining a response of the gate pin capacitance to its input slew and output load; b) synthesizing a linear time-invariant filter that matches the response; c) extending the interconnect model to include the synthesized time-invariant filter; and d) inputting the extended interconnect model into a static timing analysis for determining timing behavior between a gate input and each of its fan-out gates.

7933751, Apr 26, 2011

Aug 15, 2008

12/192459

Peter Feldmann - New York NY, US
Jason D. Morsey - Hopewell Junction NY, US
Barry J. Rubin - Croton-on-Hudson NY, US

International Business Machines Corporation - Armonk NY

G06F 17/50
G06G 7/48
G06G 7/50
G06G 7/62
G01N 15/08
G01F 7/00
G01F 17/00

703 2, 703 6, 703 7, 703 9, 703 13, 702 12, 702 45, 702 48, 702 50, 702 57

This invention relates to computing numerical solutions of linear systems of equations, specifically to implementing preconditioning of the coefficient matrix of such a system. The preconditioning applies to any coefficient matrix, dense or sparse, based on the solutions of a physical problem of unknown functions, commonly referred to as basis or interpolation functions, where the basis function spans more then one mesh element. Examples of such linear systems can result from, as examples, an electromagnetic analysis of printed circuit boards or field scattering in radar applications, fluid mechanics and acoustics. A method and system to compute a preconditioner for a coefficient matrix A that is compatible with the linear system of equations that provides basis function support over at least two mesh elements. Coupling of the preconditioner between partitions of a portioned mesh representation is only through basis functions at the partition boundaries.

7933752, Apr 26, 2011

Aug 15, 2008

12/192481

Peter Feldmann - New York NY, US
Jason D. Morsey - Hopewell Junction NY, US
Barry J. Rubin - Croton-on-Hudson NY, US

International Business Machines Corporation - Armonk NY

G06F 7/60
G06G 7/48
G06G 7/50
G01V 1/40
G01F 1/00
G01F 17/00
G01R 15/00

703 2, 703 6, 703 7, 703 9, 702 12, 702 45, 702 48, 702 50, 702 57

This invention relates to computing numerical solutions of linear systems of equations, specifically to implementing preconditioning of the coefficient matrix of such a system. The preconditioning applies to any coefficient matrix, dense or sparse, based on the solutions of a physical problem of unknown functions, commonly referred to as basis or interpolation functions, where the basis function spans more then one mesh element. Examples of such linear systems can result from, as examples, an electromagnetic analysis of printed circuit boards or field scattering in radar applications, fluid mechanics and acoustics. A method and system to compute a preconditioner for a coefficient matrix A that is compatible with the linear system of equations that provides basis function support over at least two mesh elements. Coupling of the preconditioner between partitions of a portioned mesh representation is only through basis functions at the partition boundaries.

7941775, May 10, 2011

Mar 7, 2008

12/044223

Soroush Abbaspour - Fishkill NY, US
Peter Feldmann - New York NY, US

International Business Machines Corporation - Armonk NY

G06F 17/50

716115, 716108, 716111, 716113, 716134, 703 19

An approach for performing arbitrary waveform propagation through a logic gate using timing analysis results is described. In one embodiment, there is an arbitrary waveform propagation tool for determining an effect of noise on a digital integrated circuit having at least one logic gate. A timing analysis component is configured to perform a timing analysis on the at least one logic gate and a noise analysis component is configured to perform a noise analysis. A waveform propagation model synthesizer component is configured to dynamically synthesize a waveform propagation model as a function of the timing analysis. The waveform propagation model synthesizer component is further configured to apply an arbitrary voltage waveform comprising one of a noisy waveform or noise glitch waveform and determine an effect of the arbitrary voltage waveform on the at least one logic gate from the dynamically synthesized waveform propagation model.