eldo_user

Working with S, Y, Z Parameters
Detailed Functionality
• DC Simulation.
• AC Simulation. When the CPF algorithm is chosen either by the monitor or the user, the
frequency response of the system is computed based on the found poles/residues, to
enable smooth and causal simulation results. In the case of the DSP method, AC
simulation is performed by interpolation and extrapolation of the tabulated parameters,
with the response made symmetrical around the maximal tabulated frequency point, and
the obtained spectrum is made periodic. With the SI algorithm, AC simulation produces
the frequency response of the transfer function that best fits the tabulated frequency
points. If AC simulation is performed without transient simulation and without any
method forced by the user, the response is obtained through interpolation of the given
frequency-domain data points.
• Transient Simulation. Transient simulation is obtained through the application of the
most appropriate of the CPF, DSP, or SI algorithms.
• Input data can be specified as S, Y, Z, G, H, T or A parameters.
• Tabulated data may have linear, logarithmic, or irregular distribution in its frequency
range. Frequency values may start from 0 Hz or any positive value. Any number of
points is allowed.
• The choice of the CPF, DSP, or SI algorithm can be forced through a parameter of the
model. All algorithms allow any kind of spacing. However, since internally DSP
requires linearly spaced K 2 +1 data points starting at zero frequency, it uses interpolation
and extrapolation of the input data to satisfy this requirement.
• Simulation is possible with the Eldo default options.
• For an N-port block (N>1), port impedances can be identical, or different for each port.
• Speed-optimized CFAS model.
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Eldo® User's Manual, 15.3