eldo_user

Eldo Netlist Setup
Expressions
Expressions
Expressions can be used in a netlist with the following restrictions.
• Numerical expressions must be contained within braces, { and }, single quotes, ' and ', or
parentheses, ( and ).
• String expressions should be contained in double quotes, " and ".
• Mathematical grouping within expressions must be done using normal parentheses, (
and ).
• Constants and parameters may be used in expressions, together with the built-in
functions (see “Arithmetic Functions” on page 109) and operators (see “Operators” on
page 115).
Expressions may be used in the following situations:
• Parameters in the calculation of MOS geometries and R, C and L values.
• Parameter values in the .MODEL command.
• Time point values in the signal descriptions PULSE, PWL, SFFM, SIN and EXP.
• Parameters values in the .SIGBUS command.
• Voltage and current source values.
• S and Z transform (FNS and FNZ) devices.
• .PARAM, .EXTRACT and .DEFWAVE commands.
• E and G sources described by functions or tables.
• R, C and L devices described by functions.
Examples:
Tip
Some parameters may appear in expressions but will cause an error if used in a
.PARAM command. For more information on these see “.PARAM” in the Eldo
Reference Manual.
r1 1 2 {3.0*p1-4k}
.model nn nmos vt0={p2-p2/2.0}
e1 1 2 value={15v*sqrt(v(3,2))}
.defwave pow=v(a)*i(b)
.param x1={2*sqrt(a)}
Note
By default, double quotes are used to specify a parameter string. However, in -compat
mode, double quotes are interpreted as single quotes.
118
Eldo® User's Manual, 15.3