Pittsburgh, Pa.--Feb. 9, 1998--Ansoft Corp. announced Serenade7.5 for PC-based, high-frequency circuit design. The new versionimproves the highly successful Serenade 7.0 design suite for RF circuitsused in cellular phones, pagers, wireless LANs, satellite communications,and telecommunications.
The Serenade 7.5 design suite for Windows 95 and NT is 100 percent compatible with previous versions and offers integrated schematic, circuit analysis, and layout capability in an easy-to-use graphical interface. High-frequency designs can be captured,analyzed, optimized, and physically designed, while taking performance andmanufacturability requirements into account.
The Serenade suite, combined with Ansoft's electromagnetic field solvers, Ansoft HFSS, and Maxwell Strata, allows users to include rigorous analysis of electromagneticcoupling effects within their circuit analyses.
A new harmonic-balance engine, based on Krylov subspace methods, cansimulate significantly more nonlinear devices and spectral components in asingle analysis. The new method provides a speed and memory improvement of4( for typical circuits and 10( (or more) for large circuits. Many circuitsthat previously required inordinately large CPU and memory resources cannow be analyzed on a desktop PC.
Designers of RF circuits for digital wireless applications need RF designtools that can evaluate popular digital waveforms. Serenade 7.5 has newmodulation sources for GMSK, BPSK, QPSK, DQPSK, OQPSK, and user-definedsources to support the GSM, IS-54, IS-95, and other standards. Ansoft builtthese generators directly into Serenade 7.5, so circuit designers cananalyze modulation performance at the circuit level. Users can performharmonic balance analysis with the modulation waveform and carrierfrequency specified independently. Results can be displayed in spectrumplots, eye diagrams, and constellation plots. A new capability allowsdirect calculation of adjacent channel power ratio (ACPR) for distortionevaluation. ACPR can also be set as an optimizable goal enabling directreduction of undesired nonlinear effects in modulated RF circuits.
Users need confidence that circuit models will be available formanufacturers' components. Serenade 7.5 has over 72,000 devices in theexpanded library, over 64,000 of which are new with this release. Designerscan be confident that Ansoft's device library contains the components theyneed.
Ansoft customers requested an advanced filter synthesis capability tocomplement the linear and nonlinear design suites. Ansoft answered with anew filter synthesis tool fully integrated into the Serenade 7.5 desktop.Popular filter types, like stepped-impedance, interdigital, hairpin, stub,combline, and edge-coupled, can be synthesized to user specifications.Prototype responses include Tchebyshev, Butterworth, and elliptical.Bessel, Cauer, Gaussian, or any other filter prototype can be analyzed withuser-defined G values. Filter schematics can be exported for use in theSerenade linear and nonlinear circuit optimizers. Once the filter type andresponse have been synthesized, the software automatically createsdimensions for implementations in microstrip, stripline, coax,lumped-element, and round-rod and rectangular bars for interdigital andcombline filters.
A new stability analysis capability allows Serenade users to detectnonlinear circuit instabilities and oscillations. DC Nyquist analysis andsolution path tracing predict instabilities and provide estimates ofoscillation frequencies.
Serenade 7.5 was built on a firm foundation of uncompromised simulationaccuracy. Critical circuit models have been hailed by the industry as beingthe most accurate, as they are physics-based rather than based on a limitedcurve-fitting method. Linear and nonlinear models are easily included insimulations through simple pull-down menus, and an on-line elements catalogprovides quick reference. A multiple coupled-line model (MCPL), based onefficient full-wave analysis algorithms, allows simulation of complexarrays of up to 20 coupled transmission lines. Ansoft's nonlinearsimulation tools have the lowest noise floor in the industry, relying onthe multi-dimensional FFT technique to ensure over 180 dB of dynamic range,especially important for robust harmonic balance convergence. Comprehensivemixer analysis provides fast and accurate evaluation of small-signal, fulltwo-tone, and full three-tone effects. Oscillator analysis is simplified bySerenade's oscillator design aid, followed by exact nonlinear analysis ofoscillator frequency, power, and phase noise. Design automation featureslike transmission line (TRL) synthesis, coupled-line synthesis, matchingnetwork synthesis, and a powerful automated Smith Chart graphical designutility streamline critical circuit design. The superior noise analysisallows simulation and optimization of oscillator phase noise and mixernoise figure.
Serenade 7.5 will be available on Windows 95 and Windows NT in the Springof 1998. Licensing options include a portable hardware key, node-lockedsoftware key, and network-based floating licenses. List price for asingle-user, node-locked, linear suite is $9,995; the full nonlinear suiteis $21,945.
John C. Arnold, marketing associate
Fax: (412) 471-9427
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