User Guide

Chapter 3 Preparing a design for simulation
72
DDT(x) time derivative
of x
which is applicable to
transient analysis
only
SDT(x) time integral of x which is applicable to
transient analysis
only
TABLE(x,x
1
,y
1
,...) y value as a
function of x
where x
n
,y
n
point
pairs are plotted and
connected by straight
lines
MIN(x,y) minimum of x
and y
MAX(x,y) maximum of x
and y
LIMIT(x,min,max) min if x < min
max if x > max
else x
SGN(x) +1 if x > 0
0 if x = 0
-1 if x < 0
STP(x) 1 if x > 0
0 otherwise
which is used to
suppress a value until
a given amount of
time has passed
IF(t,x,y) x if t is true
y otherwise
where t is a relational
expression using the
relational operators
shown in
Table 9
* M(x), P(x), R(x), and IMG(x) apply to Laplace expressions only.
Table 10 Functions in arithmetic expressions (continued)
This function... Means this...
Note In wave
f
orm ana
l
ysis, t
h
is
f
unction is
D(x).
Note In wave
f
orm ana
l
ysis, t
h
is
f
unction is
S(x).
Examp
l
e: {v(1)*STP(TIME-10ns)} gives a
value of 0.0 until 10 nsec has elapsed, then
gives v(1).
Pspug.book Page 72 Wednesday, November 11, 1998 1:14 PM