News – Xyce

Announcing the release of Xyce™ 7.8

December 15, 2023 — Xyce™ 7.8 has been released.

Please see the Release Notes for details.

Announcing the release of Xyce™ 7.7

August 21, 2023 — Xyce™ 7.7 has been released.

Please see the Release Notes for details.

Announcing the release of Xyce™ 7.6

November 14, 2022 — Xyce™ 7.6 has been released.

Please see the Release Notes for details.

Announcing the release of Xyce™ 7.5

June 13, 2022 — Xyce™ 7.5 has been released.

Please see the Release Notes for details.

Announcing the release of Xyce™ 7.4

November 2, 2021 — Xyce™ 7.4 has been released.

Please see the Release Notes for details.

Announcing the release of Xyce™ 7.3

May 24, 2021 — The Xyce™ team is pleased to announce the release of Xyce™ Version 7.3.

Please see the Release Notes for a complete list of new features and enhancements.

Announcing the release of Xyce™ 7.2

November 2, 2020 — The Xyce™ team is pleased to announce the release of Xyce™ Version 7.2.

Please see the Release Notes for a complete list of new features and enhancements.

Announcing the release of Xyce™ 7.1

June 8, 2020 — The Xyce™ team is pleased to announce the release of Xyce™ Version 7.1.

Please see the Release Notes for a complete list of new features and enhancements.

Announcing the release of Xyce™ 7.0

April 2, 2020 — The Xyce™ team is pleased to announce the release of Xyce™ Version 7.0. This release is focused on compatibility with commercial simulators, with a focus on HSPICE-based commercial PDKs. Therefore, several improvements have been made to Xyce™ to improve this compatibility. This release also includes the Xyce™ XDM netlist translator. XDM is a stand-alone tool for converting between different netlist types. This version of XDM can translate HSPICE and PSPICE syntax into the Xyce™ netlist syntax. The XDM User Guide includes instructions and advice for translating netlists and PDKs.

Please see the Release Notes for a complete list of new features and enhancements.

Announcing the release of Xyce™ 6.12

October 28, 2019 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.12. This release fixes a number of bugs in Xyce™ 6.11 and includes improvements to existing features of Xyce™ 6.11. Please see the Release Notes for a complete list of new features and enhancements.

Announcing the release of Xyce™ 6.11.1

June 25, 2019 — The Xyce™ team has issued a patch release version 6.11.1 to fix three specific issues in the HSPICE compatibility features that were added in version 6.11.0, but did not function as intended.

A bug in the handling of binning (Reference Guide section 2.1.17.2)
when applied to the BSIM6, PSP102, or MVSG-HV FET models was fixed,
and this technique now works correctly for those models.
The C and Q instance parameters are allowed to be solution-dependent
for the C-device. In Xyce 6.11, or earlier, an attempt to use an
expression (that did not depend on solution variables such as nodal
voltages) in the definition of other parameters, such as TEMP, for
the C device would cause a parsing error.
The -hspice-ext command line option would fail on .FUNC statements
that contained logical OR or logical AND operators. Examples were
as follows, where P1 and P2 were previously defined on .PARAM lines:

.FUNC ANDFUNC(p1,p2) {(P1&&P2) ? 1.0 : 2.0}
.FUNC ORFUNC(p1,p2) {(P1||P2) ? 1.0 : 2.0}

No changes other than these have been made since release 6.11.0.

Announcing the release of Xyce™ 6.11

June 3, 2019 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.11. This release fixes a number of bugs in Xyce™ 6.10 and includes improvements to existing features of Xyce™ 6.10. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.11 include the following.

New Devices and Device Model Improvements

Performance improvements for these device models:
- VBIC 1.3 4-terminal (BJT level 12)
- HICUM levels 0 and 2 (BJT levels 230 and 234)
- PSP version 102 and 103 (MOSFET levels 102 and 103)
- JUNCAP 200 (Diode level 200)
- MEXTRAM (BJT level 504)
- MVS 2.0.0 (MOSFET levels 2000 (ETSOI) and 2001 (HEMT))
A new "charge expression" variant of the capacitor, where users may specify a solution-dependent expression for the capacitor’s "Q" (charge) parameter.
Bug fixes for the HEMT version of MVS 2.0.0 (level 2001 MOSFET).
The BSIM3 device now supports analytic parameter sensitivities.
Device-level parameter finite-difference sensitivities are now much more efficient for transient adjoints.
A new pattern (PAT) source function was added for the V and I devices.

Enhanced Solver Stability, Performance and Features

S-parameter analysis is now supported in Xyce.
The initial guess method based on DC op solutions for HB is now
supported and it can be enabled by using the TAHB option.

Interface Improvements

Transient direct sensitivities can now be processed using .FOUR.
Parameter sensitivities are now supported for .AC analysis.
The Xyce expression library now accepts C-style ternary conditional operators.
Expressions may now contain curly braces in most contexts.
Improved support for "arithmetic operators" (e.g., + – or *) in node names and device names that are used in expressions.
Ongoing improvements to .MEASURE, including support AC measures.

Announcing the release of Xyce™ 6.10

November 30, 2018 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.10. This release fixes a number of bugs in Xyce™ 6.9 and includes improvements to existing features of Xyce™ 6.9. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.10 include the following.

New Devices and Device Model Improvements

An exponential temperature coefficient (TCE) was added to the resistor device.
The lossy and lossless transmission lines (O and T devices) now work in harmonic balance analysis.
The BSIM-CMG version 110 (MOSFET level 110) and the 3-terminal version of VBIC 1.3 (BJT level 11) have been extensively optimized. They now run much faster than they did in previous releases.
The VBIC version 1.2 (BJT level 10) is deprecated and will be removed in the next version of Xyce. Users of VBIC are strongly advised to begin using the VBIC 1.3 3T device instead.
The HICUM L2 model has been updated to the latest version (2.4.0).
A long-standing bug in applying capacitor initial conditions (when IC= was specified on the instance line of a capacitor and either NOOP or UIC was used on a .TRAN line to skip the operating point computation of a transient) has been fixed.

Enhanced Solver Stability, Performance and Features

Improved robustness for HB analysis when the TAHB option is turned off.

Interface Improvements

Sampling methods (Monte Carlo and Latin Hypercube Sampling) are now supported in Xyce, using the .SAMPLING command to specify sampling options, and .MEASURE for statistical outputs.
Sweep loops can now be specified using the HSpice-style .DATA command. This capability has been applied to .STEP, .DC and .AC analysis.
For linear circuits, .AC analysis can now also sweep device parameters at the same time as frequency, magnitude and phase.
For sensitivity analysis, .PARAM, .GLOBAL_PARAM and .FUNC now work inside of objective functions.
Model binning based on length and width parameters is now supported for MOSFET devices.

Announcing the release of Xyce™ 6.9

May 7, 2018 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.9. This release fixes a number of bugs in Xyce™ 6.8 and includes improvements to existing features of Xyce™ 6.8. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.9 include the following.

The Analog Behavioral Modeling (ABM) devices have been improved to handle "instantaneous transitions".
Xyce now provides three different device distribution strategies that can provide improved parsing and simulation performance for flattened or post-layout netlists.
Expression library now supports floor and ceil functions.
The Connectivity checker, that ensures all voltage nodes have a DC path to ground, now works with devices that have more than 10 leads.
.MEASURE and -remeasure are now supported for .DC analyses.
Doping profiles for one-dimensional TCAD devices can now be specified using expressions.
It is now possible to explicitly set time integration breakpoints from the netlist.
It is now possible to specify a list of discrete timepoints for output.

Announcing the release of Xyce™ 6.8

November 6, 2017 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.8. This release fixes a number of bugs in Xyce™ 6.7 and includes improvements to existing features of Xyce™ 6.7. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.8 include the following.

Improved robustness of GMIN stepping and SPICE DC OP strategy.
Improved performance of the BSIM-CMG model.
Addition of the Piecewise Empirical Model (PEM) memristor model.
The CSV print format is now supported for homotopy and noise output.
Improved Gnuplot compatibility for .STEP data.
Improved handling of hierarchical ".lib" file parsing.

Announcing the release of Xyce™ 6.7

May 8, 2017 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.7. This release fixes a number of bugs in Xyce™ 6.6 and includes improvements to existing features of Xyce™ 6.6. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.7 include the following.

New Devices and Device Model Improvements

The HICUM Level 0 BJT model version 1.32 was added as Xyce BJT level 230.
The HICUM Level 2 BJT model version 2.34 was added as Xyce BJT level 234.
The Multiplicity Factor (M) is now supported for the R, L and C devices.
Power output is now supported for the component inductors in both linear and nonlinear mutual inductors (K device).

Interface Improvements

A "-randseed" command line argument has been added to allow the user to specify a seed for the
random number generator that is used for the expression library’s "rand," "gauss," and "agauss" functions.
When any expression includes use of a random number function ("rand," "gauss," or "agauss"), or if
"-randseed" is given, Xyce will output the seed that is being used for that run.

Deployment Improvements

The Xyce binary release for Windows is now a 64-bit executable. Binaries for all prior releases had been
32-bit executables.

Announcing the release of Xyce™ 6.6

November 9, 2016 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.6. This release fixes a number of bugs in Xyce™ 6.5 and includes improvements to existing features of Xyce™ 6.5. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.6 include the following.

New Devices and Device Model Improvements

All Verilog-A-derived models now support lead currents, and many more devices support power output.
THE VBIC 1.2 (Level=10) MODEL IS NOW DEPRECATED, and will be removed in the next version of Xyce. Please use the VBIC 1.3 model (levels 11 and 12) instead.
The PSP MOSFET, BSIM6 MOSFET, and MEXTRAM BJT have been updated to more recent versions.
The Xyce/ADMS Verilog compiler back-end can now produce correct code for models that collapse
internal nodes to ground based on model parameter values.
The legacy version (102.5) of the PSP MOSFET has been added to Xyce as a new MOSFET level
102.
The BSIM-CMG model version 110.0.0 has been added to Xyce as a new MOSFET level 110.

Enhanced Solver Stability, Performance and Features

Improved performance of device evaluation and loading through the separation of device types.
Improved performance and scalability of parallel netlist parsing and device distribution.
Improved robustness of the internal KSparse solver by employing KLU for numeric factorization failures.
A new time step error-control method (MASKIVARS option), based on types of circuit variables.
Note: The BDF time integration method (METHOD=BDF or METHOD=6) is now deprecated. It will be removed in version 6.7 of Xyce. The Trapezoid (METHOD=TRAP or METHOD=7) and Gear (METHOD=GEAR or METHOD=8) methods will be the only supported time integration methods in version 6.7.
Improved performance and accuracy of transient adjoint sensitivity analysis.

Interface Improvements

Remeasure now supports .CSV files and comma-delimited .PRN files.
New ERROR measure calculates the norm between the measured waveform and a “comparison waveform”
specified in a file. The supported norms are L1, L2 and INFNORM.

Announcing the release of Xyce™ 6.5

June 8, 2016 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.5. This release fixes a number of bugs in Xyce™ 6.4 and includes improvements to existing features of Xyce™ 6.4. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.5 include the following.

New Devices and Device Model Improvements

BSIM6 and VBIC 1.3 enhancements with observed performance gains as high as 25% on some circuits.
Xyce/ADMS Verilog-A model compiler code generation enhancements: improved support for (initial model) and (initial instance) blocks.
Xyce/ADMS new feature: added support of white noise and flicker noise for use in small-signal noise analysis.
Noise models have been added for all devices generated from Verilog-A using ADMS, except for the FBH HBT model.
The JUNCAP200 diode model has been added as Diode level 200.
The MVS MOSFET model has been added as models level 2000 (ETSOI version and 2001 (HEMT version).
The BSIM3 and BSIM4 models can now output transconductance on the .PRINT line.
Support for tap-changing in the Power Grid Transformer model.

Enhanced Solver Stability, Performance and Features

Internal full-step Newton method is now the default for transient simulation, which improves memory efficiency and performance.
Xyce has been updated to use Trilinos 12.6.3.
Transient adjoint parameter sensitivities are now supported.

Interface Improvements

Improved support for RISE, FALL, CROSS and LAST qualifiers in .MEASURE statements.
Re-measure now supports .CSD files and .STEP with .TRAN.
Improved support for lead currents, expressions and power in .MEASURE and .FOUR statements.
Restart can now provide seamless checkpointing for all time integration methods.
Power calculations are now supported for the level 1 BJT.
Improved output for restart result interpolations.

Announcing the release of Xyce™ 6.4

January 19, 2016 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.4. This release fixes a number of bugs in Xyce™ 6.3 and includes improvements to existing features of Xyce™ 6.3. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.4 include the following.

New Devices and Device Model Improvements

VBIC version 1.3, 3- and 4-terminal variants (Q levels 11 and 12)
MEXTRAM 504.11 with self-heating (Q level 505)
New memristor device using the Yakopcic model
Support for Reactive Power limits in the Power Grid Generator Bus model.

Enhanced Solver Stability, Performance and Features

The Kundert SPARSE linear solver has been added as a linear solver option
The netlist parser has been significantly refactored to reduce memory consumption and improve parsing speeds for large circuits
Improved Harmonic Balance (HB) robustness during the initial guess calculation
New Local truncation Error (LTE) criterions that use history information of signals improve time stepping for all time integrators
Oversampling capability for Harmonic Balance time domain output enables users to produce well-resolved time-domain outputs
Arclength continuation is now much more useful and robust
Sensitivity analysis can now allow multiple objective functions

Interface Improvements

Power calculations supported for controlled-source devices (B,E,F,G and H)
Support for additional .MEASURE statement syntaxes
New output options, that allow the user to suppress the header and footer of standard-format output files
Improved error handling during netlist parsing
Improved Harmonic Balance Output
Improved compatibility between Xyce and PSpice Digital Behavioral models, via support for the DIGINITSTATE option

Announcing the release of Xyce™ 6.3

July 20, 2015 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.3. This release fixes a number of bugs in Xyce™ 6.2 and includes improvements to existing features of Xyce™ 6.2. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.3 include:

Small signal noise analysis (.NOISE)
New devices (MEXTRAM version 504, BSIM 6.1.0 and TEAM Memristor added)
.DC operating point strategy now applies SPICE-like source-stepping if other attempts fail.
New devices (Branch, Bus shunt, Transformer and PV Generator Bus) for modeling steady-state power flow in electric power grids.
ADMS back-end enhanced to generate code for analytic sensitivity derivatives.
Support for measure statements when .STEP is used.
The ability to re-measure existing data in .PRN files.
New multi-tone Harmonic Balance capability.
ADMS back-end improved to support Verilog-A ternary operators more correctly.
Extensive bug fixes and usability improvements for .MEASURE. This includes user-configurable output precision, and more informative output to standard output and log files.

Announcing the release of Xyce™ 6.2

October 9, 2014 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.2. This release is a minor release that fixes a number of bugs in Xyce™ 6.1 and includes improvements to existing features of Xyce™ 6.1. Please see the Release Notes for a complete list of new features and enhancements.

Highlights for Xyce Release 6.2 include:

Calculation of transient direct sensitivities.
Support for lead current calculation and output for Harmonic Balance (HB) analysis.
Improved interpolation for both the Trapezoid and Gear time integrators.
Improved results output (.PRINT) capabilities.
New models for a lumped transmission line and a digital latch.
Fixes for nearly 60 bugs and enhancement requests.

Also associated with this release are updates to the web site. The Frequently Asked Questions page and the instructions for adding device models to Xyce™ through Verilog-A have been updated.

Announcing the release of Xyce™ 6.1

April 14, 2014 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.1. Highlights for Xyce™ Release 6.1 include improved robustness of harmonic balance analysis, and the introduction of parallel AC, harmonic balance, and MPDE analysis. The BSIM-CMG was added as a new device, in addition to new digital models. Also, a simplified device code interface allows for easier integration of user device models into the Xyce code base. See the Release Notes for a complete list of new features and enhancements.

Also associated with this release are several additions to the web site. First, we moved the instructions for Building Xyce™ to a web page rather supplying them as a pdf. Second, we added a Frequently Asked Questions page that we will continue to expand, making it a significant resource for the Xyce™ user community. Additionally, with the improved device code interface, we have provided instructions for adding new device models to Xyce™ through Verilog-A.

Finally, a new Google Groups page has been made available as a forum for members of the Xyce community to ask questions and discuss any topic related to Xyce, including installation, use and development.

Announcing the release of Xyce™ 6.0.1

February 5, 2014 — The Xyce™ team is pleased to announce the release of Xyce™ Version 6.0.1. This release is a patch release that fixes a number of small bugs in Xyce™ 6.0. Also included is a new option for turning off transient assisted harmonic balance for faster start-up of HB simulations on linear problems. Please see the Release Notes for a complete list of new features and enhancements.

Announcing the Open Source Release of the Xyce™ Parallel Electronic Simulator

October 30, 2013 — For the first time, Xyce™, Sandia National Laboratories’ SPICE-compatible parallel circuit simulator, is available for free public download. Xyce™ has been developed internally at Sandia National Laboratories and funded by the National Nuclear Security Administration’s Advanced Simulation and Computing (ASC) Campaign. In providing an Open Source version of Xyce™ to the external community, Sandia hopes to contribute a robust and modern electronic simulator to users and researchers in the field.

While designed to be SPICE-compatible, Xyce™ is not a derivative of SPICE. It was designed from scratch to be a parallel simulation code, written in C++ and using a message-passing implementation (MPI). Xyce™ also leverages Sandia’s open-source solver library, Trilinos, which includes a number of circuit-specific solvers, such as the KLU direct solver. With its modular and flexible design, Xyce™ applies abstract interfaces to enable easy development of different analysis types, solvers and models.

Xyce™ is compatible with SPICE-based codes, in that it supports a canonical set of SPICE compact models and standard SPICE analysis methods, such as steady-state (DCOP), transient (TRAN), and small-signal frequency domain (AC). However, Xyce™ goes beyond most SPICE-based codes in a number of ways, including support for a large number of non-traditional models, such as neuron and reaction network models. Xyce™ also supports several additional analysis methods, including Harmonic Balance, Multi-Time PDE and Model-Order Reduction methods.

In releasing Xyce™ to the public, the Xyce™ development team hopes to foster external collaborations and solicit feedback from the simulation community to make Xyce™ an even more robust and useful code. Please see the Contact Us page for contact information.

New Publications

"A Hybrid Approach for Parallel Transistor-Level Full Chip Circuit Simulation," Heidi K. Thornquist and Siva Rajamanickam, in High Performance Computing for Computational Science – VECPAR 2014.
"N2A: a computational tool for modeling from neurons to algorithms, " Fredrick Rothganger, Christina E. Warrender, Derek Trumbo and James B. Aimone. Frontiers in Neural Circuits, Volume 8, Article No. 1, 2014.

Awards and Achievements

In 2008 the Xyce team received an R&D 100 Award.