SpiceAge for Windows features

Analyses - Interactive

SpiceAge includes the analyses of:

  • Frequency (AC)
  • Transient (large signal)
  • Non-linear Quiescent DC
  • Fourier


These may be further refined by the effects of component variations

  • Monte Carlo
  • Min & Max (Worst Case)


The end results may be evaluated as a family of curves by having

  • Swept components
  • Swept tolerances
  • Swept temperatures


Frequency (AC)

  • Calculate in addition to voltage, current or power: Gain, Reflection coefficient, Phase, Group delay, Noise, Impedance
  • Real, imaginary or complex plane plotting
  • Choose from several reference dB level options including gain relative to another non-ground point in the circuit
  • Temp, tolerance, & component sweeping

Transient (large signal)


  • Any number of voltage and/or current signals may used to stimulate the circuit
  • Defined in Piece Wise Linear files or · Each Programmable in any combination of: step, impulse, ramp, square triangular, sine,pulse trains.or arbitrary waveform
  • All waveform parameters are adjustable including offset, slew rate, duty cycle
  • Set initial conditions
  • Control of start, stop and step times
  • Step time and signal stimulus may be changed on the fly during a calculation.
  • Pause during transient calculation allows inspection of the results and intervention if necessary, {resUme} to continue
  • Scope mode allows transient calculations to be extended beyond their original stop time
  • Shows the traces in real-time (on autoscaling axes) as the results are calculated
  • X-Y plotting option
  • Temperature, tolerance, and component sweeping


DC - Non-linear Quiescent

  • Circuits may be started: cold or under quiescent conditions
  • Temp, tolerance, & component sweeping



  • Plotted discrete (lines to origin) or continuous spectrum
  • Hanning (raised cosine) window option
  • Inverse Fourier transform
  • Auto-dispersion (based on preceding transient analysis or frequency
  • Phase angle and various y-scale options on autoscaling axes
  • Real or Imaginary option


Monte Carlo

  • All components with a tolerance contribute to a family of curves (or quiescent voltage tabulations)
  • Each component value is chosen at random within the tolerance
  • Tolerancing statistics


Min & Max (Worst Case)

  • The values of all components are set to the MINimum or MAXimum within their tolerances
  • Negative tolerances may be used to create an algebraically negative value change


Swept components

  • Components may optionally take vs (start value) and vf (finish value) pragmas between which a number of swept values produce a family of curves


Swept tolerances

Swept temperatures

  • Temperature may be swept to produce a family of curves in a DC, AC or transient analysis


Sweeping functions for family of curves generation

  • linear
  • logarithmic
  • MIN, MAX
  • Monte Carlo




  • B, Battery (constant voltage source)
  • A, Constant current source
  • R, Resistor
  • Cg, Conductor
  • Sq, Square law conductor
  • Diodes - Fast (area factor +offset temp.) and Zener models
  • Diodes (SPICE.mod implementation). Level 7
  • C, Capacitor
  • L, Inductor
  • LINE, Transmission line (4 terminal) - Frequency and time domain
  • I, current generator
  • V, voltage generator
  • Z, Zener diode
  • S, Voltage-controlled switch with offset and delay (SPICE.mod implementation). Level 7
  • VCVS: (voltage controlled voltage source)
  • VCCS: (voltage controlled current source)
  • CCVS: (current controlled voltage source)
  • CCCS: (current controlled current source)
  • E (SPICE VCVS). Level 7
  • G (SPICE VCCS). Level 7
  • H (SPICE CCVS). Level 7
  • F (SPICE CCCS). Level 7
  • Q, BJT (SPICE.mod implementation). Level 7
  • J, JFET (SPICE.mod implementation). Level 7
  • M, MOSFET (SPICE.mod implementation). Level 7
  • K SPICE coupling coeffient. Level 7
  • SPICE .models and subcircuits. Level 7
  • Logic gate primitives (high speed). Level 11 and above
  • Digital bus generator. Level 11 and above
  • S parameter and Y parameters defined networks


Component Variables/Functions

  • Polynomials non-linearities (all components)- outside of range limiting pragmas
  • Frequency dependent PWL
  • Temperature coefficients
  • offset and linear. Level 3 and above
  • 2nd order and exponential. Level 7 and above
  • Independent & dependent source
  • Delay, jitter
  • Initial conditions
  • Values voltage controllable
  • Magnetic saturation and hystersis


Macro Models Library (open models)


Topology changable and value trimmable

  • NPN/PNP BJT transistors
  • FET field effect transistors
  • OpAmps
  • Thyristor
  • Triac
  • Diodes
  • Bridge rectifier
  • Transformers
  • Logic gates
  • 555 timer
  • Zetex SPICE library
  • Components with value modulated by a controlling voltage ADMUL.lib, admittance VMUL.lib, voltage ZMUL.lib, impedence
  • Phase lock- loop
  • Voltage controlled oscillator
  • Triode vacuum tube
  • TTL Library (gates, latches counters). Level 11 and above



Graphical Presentation

  • 4 trace plots
  • Smith charts
  • Auto or user defined scaling · Fully adjustable on each trace
  • Automatic graph labels
  • Choice of reference signals
  • Pen-width control, thick trace option
  • Offset and multiplier adjustments
  • Displays parameters of
    • voltage
    • signal to noise
    • current
    • noise density
    • power
    • impedance
    • gain
    • phase
    • noise
    • group delay
  • 'Scope' on-line mode to show results plotted in Real time
  • X-Y locus plotting (Lissajou figures, phasor diagrams, etc.)
  • Font scaling option (for screen dumps)
  • Paste over plot comparisons
  • User-definable and placeable labels
  • Truetype fonts
  • Digitizing cursor- Single point or differences
  • Optional graph grid
  • Tiling of multiple netlist windows and/or graph windows
  • Window dedicated to screen capture
  • Direct graph printer dump, Windows drivers
  • Logic circuit analyzer - 32 channels. Level 11 and above


Output Waveforms

  • ASCII and .WAV file compatibility
  • Output file is in the same syntax as user defined input signals
  • Output of one circuit may be chained as the input of the next circuit



  • Tabular (unlimited) or graphic (4 traces)
  • Real time
  • Interruptable settings change


Additional Features


  • Circuit size only limited by RAM memory
  • Built-in ASCII file editor
  • Full color palette
  • SI abbreviated or exponential notation
  • Comprehensive On-line help; tutorials / examples
  • .INI file to personalize initialization
  • 300+ page manual
  • Convenient menu system
  • User selected reference node
  • Sparse matrices - saves memory, increases speed
  • Concurrent analysis from within iconised windows


DDE (dynamic data exchange)


Interface with:

  • SAWTEST example circuit / analyses files (included)
  • MODELMAKER component synthesis (option)
  • Schematic capture companion products
  • Third party CAE software


Circuit Size

  • Calculation speed optimized for circuits up to 300 nodes
  • Larger circuits (up to 1800 nodes) limited only by available RAM


Node Notation

  • Node numbers, real signal or real pin names (alpha-numeric) may be used



Software for engineers


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ModelMaker A set of applets for defining component models using data sheet information.