eldo_user

Simulator Compatibility
Commands in Compat Mode
r1 1 0 1
r2 2 0 1
.alter 1
r1 1 0 2
.alter 2
r2 2 0 2
The second “alter” simulation will be run with both r1 set to 2 (inheritance from later
number 1), and r2 set to 2. In default Eldo mode without the -compat argument, the
second “alter” simulation will be run with r1 set to 1 (original netlist) and r2 set to 2.
Option COMPAT can be placed anywhere in the netlist; it is not order-dependent.
However, if the netlist contains .ALTER statements, and the option is placed in the
.ALTER block then it will not be taken into account in the nominal run, only the
.ALTER run. Then it will remain active for any further .ALTER runs. For example, if
the netlist contains:
title
netlist
.alter 1
.option compat
.alter 2
*...
.end
v1 1 0 1
r1 1 0 1
.dc
.end
Here, the nominal run will not recognize the COMPAT option, the first .ALTER will,
and the second .ALTER will also. The statements between the last two .END statements,
which correspond to the simulation of yet another circuit, will still treat COMPAT as
active. Once activated, compat cannot be deactivated.
See the “.ALTER command” in the Eldo Reference Manual.
• .DC
When only a DC analysis is specified in compat mode, by default the initial transient
value is used.
For .DC with .OP, a DC sweep is done before any OP calculations. The Eldo default
behavior, and in hybrid compat mode (with .COMPAT/.ENDCOMPAT blocks but
without .OPTION COMPAT), is to perform the OP around the first point of the DC
sweep.
See the “.DC command” in the Eldo Reference Manual.
• .EXTRACT RMS()
In compat mode, this extract returns the root mean square value of a waveform for
transient analysis, computed as:
Eldo® User's Manual, 15.3 169