Announcing Broadband SPICE™ (Sigrity)

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SANTA CLARA, Calif. — May 21, 2002 — SIGRITY, INC. today announced the release of a new software tool, Broadband SPICE™, for generating accurate SPICE circuits over broadband frequencies for networks of complex frequency domain responses.

Broadband SPICE™ extracts highly accurate SPICE equivalent circuits from network parameters over broadband frequencies. The network parameters can be scattering, impedance or admittance (S, Z or Y) parameters of an N-port network in Touchstone™ file format. The N-port network can be as simple as a two-terminal (1-port) component or a multi-port complex system. The network parameters can be obtained from actual measurements or from full-wave, broadband electromagnetic field solvers.

HSPICE™, PSPICE™, or other SPICE compatible circuit simulators, including SIGRITY’s own time-domain simulator SPEED2000™, can then use the extracted SPICE circuits for DC, AC and transient analysis. Broadband SPICE™ can be used as a stand-alone tool for the conversion of network parameters to SPICE circuits.

Capabilities of existing tools on the market for similar functions have various limitations that can be characterized as follows:

  • Inability to generate accurate SPICE circuits over broadband frequencies for networks of complex frequency domain parameter curves.
  • Parameters of extracted SPICE circuits are of extreme values - either extremely small or extremely large - which are unacceptable to SPICE simulators. This situation frequently happens for networks of complex frequency domain responses.
  • User has no knowledge of the accuracy of extracted SPICE circuits in comparison with the original network parameters.
  • User has to specify certain conditions, of which he has no knowledge, before extraction -- such as the order of extracted circuits. The user often does not know the number of orders the circuit should be, and cannot determine the difference in accuracies between circuits of different orders.
    Some circuit simulators can take S-parameters directly to perform transient simulations. Such simulators do the conversion to SPICE circuits or perform certain fitting processes internally, or simulate the time-domain responses through direct convolution. They will face the same difficulties above if the conversion or fitting is done internally. Otherwise, direct convolution makes the transient analysis extremely slow, as can be experienced in some of these simulators.

SIGRITY’s breakthrough technologies implemented in Broadband SPICE™ yield the following superior properties:

  • Highly accurate extracted SPICE circuits over broadband frequencies.
  • Easy conversion of SPICE circuits at the touch of a button.
  • Generation of acceptable parameters to SPICE simulators (parameters of extracted SPICE circuits, using our proprietary topologies, are generally not of extreme values).
  • Immediate assessment of the accuracy of extracted SPICE circuits, and comparison of the responses of extracted SPICE circuits against those of original network parameters.
  • Automatic determination of topologies and orders of circuits according to the complexity of network parameter curves and the user required maximum frequency.
  • Faster simulation in HSPICE achieved by customized HSPICE-specific equivalent circuits with much fewer number of circuit components.
  • Convenient user interface to allow review and editing of DC values of network parameters, which may be automatically extrapolated if not user provided.

PowerSI, SIGRITY’s full-wave power and signal integrity tool optimized for frequency-domain analysis, and Broadband SPICE™ can closely work together. After completing the frequency-domain analysis in PowerSI, the computed results can be exported in Touchstone™ format, which can then be loaded into Broadband SPICE™ and converted to SPICE circuits. The SPICE circuits generated by Broadband SPICE™ can also be used in SPEED2000™ for time-domain simulations.

Pricing and Availability
Broadband SPICE™ is available now! North America customers may request an evaluation license by contacting SIGRITY’s sales office (408-260-9344) or please send an Email: Customers outside of North America should contact their local sales representatives.

Perpetual license pricing starts at $10,000 (plus $1,500 for annual maintenance). A one-year license is also available. A special promotion for early adopters will be offered on orders received by July 31, 2002. Contact SIGRITY or your sales representative for details.

About SIGRITY Incorporated
SIGRITY, INC. is a privately held U.S. corporation established in 1994 and incorporated in 1998. SIGRITY provides software tools and services to enable the rapid development of high-performance products in an environment of ever-increasing circuit speed and packaging complexity. The core technologies for the fast electromagnetic computation methodologies used in SPEED2000 were granted two U.S. patents. SIGRITY received the National Science Foundation Small Business Innovation Research (SBIR) Award Phase I in 1996, Phase II in 1997 and Phase IIB in 2000. SIGRITY's first software package, SPEED97, was released in May of 1997 - followed by a major upgrade, SPEED2000 in July of 2000. The SPEED tools have been adopted by leading companies in computer, networking, communications and consumer electronics markets. Corporate headquarters are located at 4675 Stevens Creek Blvd., Suite 130, Santa Clara, CA 95051. World Wide Web site:

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