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4.9 Advanced frequency domain analyses
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variable. The variable may be either frequency or some device instance parameter. Not all device
instance parameters are modifiable, and some of those that will change the DC operating point
when modified. If changing a parameter affects the DC operating point, it will be recomputed on
each step. The modified parameter is reset to its original value after the analysis.
ANALYSIS DEFINITION:
Name sp <parameter=value> . . .
ANALYSIS PARAMETERS:
annotate Integer (default is global annotate level): degree of annotation. Values from 1 to 7
turn on display of generic information about the analysis run. Values above 7 are bitwise
and turn on specific printouts:
0x08 : print MNA matrix; 0x10 : dump MNA matrix in the "analysis_name.m" file.
freq Real (-): the frequency value when a device value parameter is swept or the frequency
value in single frequency analysis. This parameter must not be specified contemporary to
the frequency sweeping command.
port Active port, may be repeated
file S-parameters output file name
start Start sweep limit
stop Stop sweep limit
center Center of sweep
span Sweep limit span
step Step size, linear sweep
lin Number of points, linear sweep
dec Points per decade
log Number of points, log sweep
sweep Device whose parameter value is to be swept
param Name of parameter to be swept
4.9.5
Noise analysis of a periodic circuit
Noise analysis computes the total noise at the specified port of a circuit. Noise is computed by
linearising the circuit in the operating point, therefore a DC analysis is done before any noise
analysis if a valid operating point is not available, yet. The thermal, shot and fliker sources of
noise in circuit elements are considered. Note that since the circuit is linearised in the operating
point, currents of elements have constant values.
ANALYSIS DEFINITION:
Name noise <parameter=value> . . .
ANALYSIS PARAMETERS:
annotate Degree of annotation. It is an integer number values from 1 to 7 turn on displaying
of generic informations about the analysis run.
start Start sweep limit
stop Stop sweep limit
center Center of sweep
span Sweep limit span
step Step size, linear sweep
lin Number of points, linear sweep
dec Points per decade
log Number of points, log sweep
freq Real (-): the frequency value in single frequency analysis. This parameter must not be