eldo_user

Specifying Simulation Output
Types of Waveforms
Types of Waveforms
This section describes the types of waveforms generated by Eldo.
Plotting Output Variables
Many different simulation results can be created by Eldo. The simulator can output simple node
voltages, but also currents through devices, currents through device or subcircuit pins, power
quantities, S parameters, internal variables from device models, and so on. All these results are
direct raw results from a simulation. For example:
.PLOT TRAN V(OUT)
.PLOT DC ISUB(XBIAS.VOUT)
Plotting Extractions
The .PLOT command may also be used to plot extraction results. A flexible language exists in
Eldo to extract characteristics from raw simulation results (for example the maximum value of a
waveform, or the time at which a given threshold is crossed by a waveform, and so on). See
“Extracting Information” on page 321 and “Plot and Print Quantities” on page 323.
Plotting Templates
The .PLOT command combined with the .DEFWAVE command can be used to generate socalled
template waveforms. Using .PLOT, these templates can be displayed together with the
simulation results. See “Defining Waveforms” on page 336.
Related Topics
Monitoring of Hierarchical Nodes
Plotting, Printing and Probing
Monitoring of Hierarchical Nodes
This output format is used to specify nodes that lie within subcircuits. The node itself cannot be
referenced directly from the ‘top-level’ of the circuit and so it must be addressed through the
levels of the subcircuit by separating elements with periods (.) in the output control statement.
The example below illustrates this output format.
.subckt sc1 n10 n12
r10 n10 n11 0.2
x2 n11 n12 sc2
.ends sc1
.subckt sc2 n20 n22
r20 n20 n21 0.1k
r22 n21 n22 0.1k
.ends sc2
x1 a b sc1
.print tran v(x1.x2.n21) v(a) v(b)
Eldo® User's Manual, 15.3 309