Allegro/OrCAD/PSpice Version History

PSpice now supports an enhanced encryption engine for model libraries, providing stronger security protection for encrypted PSpice models using the existing command lines and arguments. Existing encrypted libraries can be re-encrypted with the updated secure encryption mechanism with the command:
PSpiceEnc <old_filepath> <enhanced_filepath>

The re-encryption process only applies to the portions of the library that are already encrypted. Additionally, libraries encrypted with a user-defined key can also be re-encrypted.

PSpice now allows modeling of nonlinear behavior for passive devices such as resistors, capacitors, and inductors using mathematical functions. Nonlinear devices are available under the Ideal Devices > Passive Category in the Component Explorer panel.

PSpice A/D now supports the following step, mathematical, and random functions to model the electrical behavior of a circuit:

• SMSTP(X)
• STPA(X)
• BUF(X)
• DNLIM(LOWERLIMIT,X,SOFTNESS)
• HYPOT(X,Y), LENGTH(X,Y)
• INT(X), TRUNC(X)
• INV(X)
• UPLIM(X, UPPERLIMIT,SOFTNESS)
• URAMP(X)
• NRAND(X, S)
• ZRAND(X, S)
• RANDOM(X, S)
• ZRANDOM(X, S)
• ROUND(X)
• WHITE(X, S)

PSpice now supports advanced built-in functions to model memristors. The new models are included in the memristor.olb library.

Transient sources for standard CI 210 have been added, which test AC immunity from continuous disturbances. PSpice now supports the following additional ISO 16750-2 transient sources used for automotive applications for 12V and 24V systems:

• 9.1 Single Line Interruption
• 6.4 Load Dump Without Centralized Load Dump Suppression – Test A
• 6.4 Load Dump With Centralized Load Dump Suppression – Test B

GaN MOSFET models are now available and can be accessed from the Component Explorer panel under Discrete.

PSpice now supports sweeping of components models to perform design exploration with different models in a single simulation run. Evaluate different models for a given base model and compare them to see how the circuit behavior changes for different models.

The .MEASURE commands can now be used to evaluate complex expressions that include node voltages and current. Additionally, different parameters, including voltage, current, global parameters, and temperature; can be swept.

OrCAD X PSpice Designer and OrCAD X PSpice Designer Plus now have access to OrCAD X Cloud.

Use the .MEASURE command to analyze the output of transient, AC, and DC analyses. This command lists the user-defined complex measurement expression to compute the electrical specifications of a circuit in simple text format.

Behavioral diode models are computationally less expensive compared to normal diodes. You can simulate behavioral diode models to analyze the breakdown behavior of a diode for circuit analysis. This also supports temperature effects using temperature coefficients and noise parameters for noise analysis.

PSpice A/D now supports temperature coefficients and grading coefficients:

• TTT1: Transit time temperature coefficients (linear)
• TTT2: Transit time temperature coefficients (quadratic)
• TM1: Linear temperature coefficient for p-n grading coefficient
• TM2: Quadratic temperature coefficient for p-n grading coefficient

ISO Transient sources for automotive applications including ISO 7637-2 for electrical disturbances form conduction and coupling and ISO 16750-2 for environmental conditions and related testing.

Parallel simulation support for parametric sweep, temperature sweep, and Monte Carlo Analysis on desktop to improve performance.

Control noise contributors in noise analysis to produce an accurate simulation.

Use a .wav file as a simulation input or export a .wav file as an output to perform audio simulations.

Use and create PSpice simulation personas as a simplified way to globally apply simulator options.

Cadence Doc Assistant presents help content as individual easy-to-read topics and has improved the speed and relevance of search capabilities.

Wizard-based Modeling Application support for efficient creation of digital models including gates, digital pulse, digital stimulus, flip-flops, and latches.

Include temperature coefficients in model definitions, express temperature as a function of time, and perform a single simulation to understand the effect of temperature variation.

Model and simulate repeated exponential electrical fast transients (EFTs), commonly required in stress testing of AC power mains, automotive DC electrical systems, ethernet and data lines.

Enhanced error and warning messages for expressions leading to high or abnormal values helps users pinpoint issues and ensure convergence.

Input data points from the measured inductor response in the laboratory or extracted datasheet information to quickly and easily model non-linear and frequency dependent impedances.

Easily model an inductor or impedance that varies with frequency using frequency tables in CSV format.

Support for expressions in the PSpice Modeling Application has been extended to the digital clock source, DigClock.

Define the number of top noise contributors to be reported during noise analysis.

PSpice now supports simulation for circuits containing zero value resistors.

Automatic calculation of power dissipation deration for custom-derated resistors. Hierarchical components can now be filtered in the smoke analysis results.

Automatically calculate both the 3-Sigma and 6-Sigma values during Monte Carlo Analysis for a greater level of accuracy.

Access additional Texas Instrument Libraries from OrCAD Capture including 5000 TI-PSpice Models across 100 unique model categories and as many as 4000 test circuits.

Auto launch of PSpice on new project creation, updated menus, and updated PSpice search.

MATLAB 2020/2021 support is now available for PSpice co-simulation flows.

Get notified for missing parts for your PSpice models as you place them with Online DRC. Navigate warnings and errors with cross-probe between DRC and schematic. PSpice parts are loaded automatically when a new PSpice project is created. Improved capture integration with the ability to view PSpice models within Capture.

Easy-to-use DIODE and MOSFET model parameters from device datasheet, specifically targeted for power applications.

You can now create complex expressions of up to 245 characters in netlists. The length of lines in netlist has been increased from 132 to 245 characters.

Numerical values can now have a higher precision as the minimum parameter value supported is 1e-80 in comparison to the earlier 1e-33.

Convergence has been enhanced because of the following new controls for Pseudo Transient Analysis to handle bias point convergence:

• PTRANABSTOL: Determines stabilization of currents (capacitor). Default value is 1e-7
• PTRANVNTOL: Determines stabilization of voltages (inductor). Default value is 1e-6.
• PTRANSTABSTEPS: Sets the maximum iterations to run before stopping. Default is 2100000.

The process of Device Modeling Interface (DMI) has been enhanced with the ability to generate Device Modeling Interface (DMI) template independent of MS Visual Studio version. Use use any version of MS Visual Studio to generate DMIs.

The new enhancements in PSpice Advanced Analysis (AA) allow users to run PSpice AA on existing designs without the need to update any parts/models of the design. The key functional enhancements including:

• • Assign global tolerance on device/model parameters
  • Assign global tolerance on global variables
  • Assign global tolerance on Voltage and Current sources
  • Assign global tolerance on sub circuit parameter
  • Models downloaded from web can be readily used in Advanced Analysis flows
  • Enhancements in PSpice AA GUI