Hewlett-Packard Development Company, L.p.

Ansys, Inc.

Sas IP, Inc.

Michael J Tsuk

Jacob K White

Karl Joseph Bois

David W Quint

Brian Kirk

Daniel Wissell

J Eric Bracken

Amit Hochman

Colin E Brench

Subramanian N Lalgudi

Daniel A Strickland

Systems and methods are provided for simulating an electrical characteristic of an electronic device having input ports and output ports. A device frequency response data structure is accessed that contains data associated with a plurality of port-to-port frequency responses of the electronic device, each port-to-port frequency response being associated with a plurality of frequencies. A QR decomposition is performed based on data from the frequency response data structure. A subset of the port-to-port frequency responses is selected based on the QR decomposition. A set of common poles is identified using the selected subset of port-to-port frequency responses, and a model of time domain behavior of the electronic device is generated using the set of common poles.

Systems and methods for parameter fitting and passivity enforcement for multi-port electronic devices

A model synthesizer generates a state-space model of a structure from frequency domain parameters of the structure using a selected number of significant eigenvalues of a matrix derived from the frequency-domain parameters such that the quality of the fit of the model is improved. A matrix of the frequency-domain parameters is reshaped so as to improve performance of determination of the fit quality. Passivity violations in the model can be removed via regularization and error control such that the fit quality of the model after removal of the passivity violations is within a specified tolerance. Cholesky factorization can improve the performance of passivity violation detection. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Enhancements to parameter fitting and passivity enforcement

Systems and methods are provided for constructing a physical transmission line system. Characteristic data associated with a transmission line system is received. A model of the transmission line system is built based on the characteristic data. Building a model of the transmission line system includes determining a characteristic admittance matrix based on the characteristic data, determining a propagation function matrix based on the characteristic data, calculating a linking matrix based on the characteristic admittance matrix and the propagation function matrix, and determining a state space model based on the characteristic admittance matrix and the linking matrix. A simulation is performed using the state space model to determine a physical characteristic, where the transmission line system is built or modified based on the simulation-determined physical characteristic.

Processor-implemented systems and methods for multi-conductor transmission line simulation

In various embodiment, a simulator includes an analysis module for extracting transmission-line parameters of a transmission-line system from a network-parameter representation thereof, using discontinuity-detection-based phase unwrapping without introducing artificial discontinuities, and a simulator module for simulating the response of the transmission-line system to an input based on the extracted transmission-line parameters.

Transmission-line simulators and methods

A simulator includes an analysis module for extracting a state-space model of response of a physical system to an input from a frequency-domain representation thereof, using a SVD, and singular vectors thereof, of a Loewner matrix derived from the frequency-domain representation, and a simulator module for simulating the response of the physical system in the time domain based on the extracted state-space model.

State-space model-based simulators and methods

A method for affecting an impedance of a portion of an electrical circuit loop in an electrical circuit apparatus includes providing an electrical circuit apparatus having at least a portion of an electrical circuit loop including at least one of at least one trace and at least one via, and providing a layer of magnetic material disposed adjacent at least one of the trace and the via. The trace and the via are operatively connected together to provide electrical communication. Dielectric material is disposed in an operative relationship adjacent at least one of the trace and the via. The layer of magnetic material is disposed in operative relationship near at least one of the trace and the via to affect the impedance of at least one of the trace, the via and the portion of the circuit loop formed by the trace and the via.

Method for affecting impedance of an electrical apparatus

Methods and apparatuses for affecting the frequency behavior of connections within a printed circuit board or an integrated circuit are disclosed. Some embodiments include a printed circuit board comprising, a plurality of conductive layers each comprising at least one conductive pad, where each conductive pad on the conductive layers includes a vacancy, and an insulating material disposed about the conductive layers such that the vacancies are at least partially filled with the insulating material.

Printed circuit board including pads with vacancies

In one embodiment, a clock generation system comprises first and second hot-swappable oscillator (HSO) devices that generate respective timing signals, a plurality of controllable attenuators for controllably attenuating one of the timing signals, a combiner for combining the timing signals, a redundant clock source (RCS) device for generating at least one clock for distribution to other circuits using an output of the combiner, and logic for switching which of the timing signals is attenuated in response to failure of one of the first and second HSO devices.

Systems and methods for clock generation using hot-swappable oscillators

A system and method for determining the dielectric properties associated with a substrate. In one embodiment, a network analyzer measures scattering parameters for at least two lines of substantially identical cross-section embedded within the substrate over a specified frequency range. A first engine determines a complex propagation constant based on the scattering parameters and defines the complex propagation constant in terms of an attenuation component and a phase component. A second engine, responsive to the phase component, determines a relative permittivity parameter associated with the substrate over the specified frequency range. A third engine, responsive to the attenuation component and the relative permittivity parameter, performs a least squares analysis to determine a loss tangent parameter associated with the substrate over the specified frequency range.

System and method for determining a dielectric property associated with a substrate

A hexagonal conductor path layout for power and ground distribution planes in a multi-layer VLSI device. The invention reduces crosstalk between switching devices in signal nets by reducing impedance in the distribution planes. Impedance is reduced by providing more direct line current paths and providing maximum path change angles of less than ninety degrees. Reduced impedance causes reduced coupling between current flows which share a common path and hence less crosstalk.

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Arlington, MA, United States of America

Michael J Tsuk