eldo_user

Introduction to Eldo
Getting Started With the Eldo Simulation Flow
* Subcircuit calls
x1 1 2 6 inv
x2 2 3 6 inv
x3 3 4 6 inv
cload 4 0 1p
* Electrical source definitions
vdd 6 0 5v
vin 1 0 pulse(0 5 10e-9 5e-9 5e-9 30e-9 50e-9)
* Simulation options & commands
.tran 0.5n 100n uic
.ic v(1)=0
.plot tran v(1) v(2) v(3) v(4)
.print tran v(1) v(2) v(3) v(4)
.option eps=0.5e-3 tnom=50 list node
.end
Prerequisites
• The netlist file must include the following:
o
o
o
o
Circuit connectivity, that is, a netlist.
Model parameter values defining the specific device models to be used.
Electrical stimuli (sources).
Simulation options and commands.
Input and output formats are compatible with Berkeley SPICE 2G6, however Eldo
provides additional features not implemented in SPICE. See “Eldo Netlist Setup” on
page 95.
Procedure
1. Setup a netlist with the circuit description and simulation options and commands. You
may generate the .cir control file for Eldo using a basic text editor, or alternatively a
schematic editor capable of generating SPICE-like format.
See “Eldo Netlist Setup” on page 95.
2. Run Eldo on the netlist to simulate your design. To run a simulation from the command
line use the command:
eldo cir_file_name.cir
For a full list of options see “Running Eldo” on page 41.
3. Analyze the results of your simulation during or after simulation.
After the simulation has complete, Eldo writes simulator information to the .chi file.
This file contains details of the simulation, including any warning or error messages
which may have been encountered during simulation. A binary .wdb file is also
Eldo® User's Manual, 15.3 33