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（接上）The difference of two voltages; e.g., V(a)-V(b); can equivalently written as V(a,b). The following functions are available for real data:
Function Name
Description
abs(x)
Absolute value of x
acos(x)
Arc cosine of x
arccos(x)
Synonym for acos()
acosh(x)
Arc hyperbolic cosine
asin(x)
Arc sine
arcsin(x)
Synonym for sin()
asinh(x)
Arc hyperbolic sine
atan(x)
Arc tangent of x
arctan(x)
Synonym for atan()
atan2(y, x)
Four quadrant arc tangent of y/x
atanh(x)
Arc hyperbolic tangent
buf(x)
1 if x > .5, else 0
ceil(x)
Integer equal or greater than x
cos(x)
Cosine of x
cosh(x)
Hyperbolic cosine of x
d()
Finite difference-based derivative
exp(x)
e to the x
floor(x)
Integer equal to or less than x
hypot(x,y)
sqrt(x**2 + y**2)
if(x,y,z)
If x > .5, then y else z
int(x)
Convert x to integer
inv(x)
0. if x > .5, else 1.
limit(x,y,z)
Intermediate value of x, y, and z
ln(x)
Natural logarithm of x
log(x)
Alternate syntax for ln()
log10(x)
Base 10 logarithm
max(x,y)
The greater of x or y
min(x,y)
The smaller of x or y
pow(x,y)
x**y
pwr(x,y)
abs(x)**y
pwrs(x,y)
sgn(x)*abs(x)**y
rand(x)
Random number between 0 and 1 depending on the integer value of x.
random(x)
Similar to rand(), but smoothly transitions between values.
round(x)
Nearest integer to x
sgn(x)
Sign of x
sin(x)
Sine of x
sinh(x)
Hyperbolic sine of x
sqrt(x)
Square root of x
table(x,a,b,c,d,...)
Interpolate a value for x based on a look up table given as a set of pairs of points.
tan(x)
Tangent of x.
tanh(x)
Hyperbolic tangent of x
u(x)
Unit step, i.e., 1 if x > 0., else 0.
uramp(x)
x if x > 0., else 0.
white(x)
Random number between -.5 and .5 smoothly transitions between values even more smoothly than random().
For complex data, the functions atan2(,), sgn(), u(), buf(), inv() uramp(), int(), floor(), ceil(), rand(), min(,), limit(,), if(,,), and table(...) are not available. The functions Re(x) and Im(x) are available for complex data and return a complex number with the real part equal to the real or imaginary part of the argument respectively and the imaginary part equal to zero. The functions Ph(x) and Mag(x) are also available for complex data and return a complex number with the real part equal to the phase angle or magnitude of the argument respectively and the imaginary part equal to zero. The function conj(x) is also available for complex data and returns the complex conjugate of x.
The following operations, grouped in reverse order of precedence of evaluation, are available for real data:
Operand
Description
&
Convert the expressions to either side to Boolean, then AND.
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Convert the expressions to either side to Boolean, then OR.
^
Convert the expressions to either side to Boolean, then XOR.
>
TRUE if expression on the left is greater than the expression on the right, otherwise FALSE.
<
TRUE if expression on the left is less than the expression on the right, otherwise FALSE.
>=
TRUE if expression on the left is less than or equal the expression on the right, otherwise FALSE.
<=
TRUE if expression on the left is greater than or equal the expression on the right, otherwise FALSE.
+
Addition
-
Subtraction
*
Multiplication
/
Division
**
Raise left hand side to power of right hand side.
!
Convert the following expression to Boolean and invert.
@
Step selection operator
TRUE is numerically equal to 1 and FALSE is 0. Conversion to Boolean converts a value to 1 if the value is greater than 0.5, otherwise the value is converted to 0.
The step selection operator, '@' is useful when multiple simulation runs are available as in a .step, .temp, or .dc analysis. It selects the data from a specific run. For example, V(1)@3 would plot the data from the 3rd run no matter what steps where selected for plotting.
For complex data, only +, -, *, /, **, and @ are available. Also with regard to complex data, the Boolean XOR operator, ^ is understood to mean exponentiation, **.
The following constants are internally defined:
Name
Value
E
2.7182818284590452354
Pi
3.14159265358979323846
K
1.3806503e-23
Q
1.602176462e-19
The keyword "time" is understood when plotting transient analysis waveform data. Similarly, "freq" and "omega" are understood when plotting data from an AC analysis. "w" can be used as a synonym for omega.
2. Compute the average or RMS of a trace.
The waveform viewer can integrate a trace to obtain the average and RMS value over the displayed region. First zoom the waveform to the region of interest, then move the mouse to the label of the trace, hold down the control key and left mouse click.
3. Display the Fourier Transform of a Trace.
You can use the menu command View=>FFT to perform a Fast Fourier transform on various data traces. |
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发表于 2010-4-21 09:13
