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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim Linear Network Analysis >
   Running LNA from the Netlist Editor >
       LNA Netlist Syntax           

LNA Netlist Syntax

The netlist syntax of the Linear Network Analysis statement is:

.LNA frequencies [FLAG=analysis_flag] [GROUP_DELAY_PERT=val]
[NOISE_OUTPUT=[list_of_outputs]]
[INPUT_REFERRED_NOISE=[source]]

Optionally, the netlist may also contain an output statement of the form:

.PRINT AC list_of_outputs

LNA Frequency Sweep

The entry frequencies specifies a sweep of frequencies to be applied in the analysis.

The frequencies field has several formats.

The sweep can be just a single frequency value.

A second form of frequencies specifies the starting and ending frequencies, and the incremental step:

[START=]start_val [STOP=]stop_val [STEP=]step_val

If the sweep specification omits the START=, STOP=, and STEP= labels, the start value, stop value and step value must be entered in the order shown. If the labels are used, the values may be entered in any order, but then all three values must have labels.

A third form for the frequencies field has the format:

freq_sweep_type numpoints startfreq stopfreq

This format specifies a count of analysis frequencies defined by numpoints, startfreq and stopfreq, using one of the predefined freq_sweep_type tokens LIN, DEC, or OCT:

LIN
Linear sweep at numpoints different frequencies from the frequency given by startfreq to the frequency given by stopfreq. The spacing between test frequencies is

(stopfreq − startfreq) / (numpoints − 1).

DEC
Logarithmic sweep at numpoints different frequencies in each decade (10× multiple of startfreq) from startfreq to stopfreq. The spacing between test frequencies is logarithmic within decades.

OCT
Logarithmic sweep at numpoints different frequencies in each octave (2× multiple of startfreq) from startfreq to stopfreq. The spacing between test frequencies is logarithmic within octaves.

A fourth format for the frequencies field is:

POI numpoints freq1 [freq2 ...]

This form provides a space-separated list of numpoints test frequencies.

LNA Analysis Flag

The analysis_flag is a string (enclosed in single quotes) that specifies the analyses to be performed. The valid entries for analysis_flag are:

'LNA'
Linear network analysis

'NOISE_DC'
DC noise analysis

'LNAN'
Linear network and DC noise analyses

'LNAG'
Linear network and group delay analyses

'LNANG'
(Default) Linear network, DC noise, and group delay analyses (LNAGN is a synonym for LNANG)

Group Delay Perturbation Factor

When the analysis_flag on the LNA statement is ‘LNAG’ or ‘LNANG’, group delay analysis is enabled. The entry GROUP_DELAY_PERT specifies the perturbation to be applied in calculating group delay. The perturbation is specified as a percentage of the test frequency (see the LNA Technical Notes).

Noise Contributions

The .LNA statement can include specifications for noise output and for input-referred noise.

The syntax entry:

NOISE_OUTPUT=[list_of_outputs]

specifies that noise output is to be calculated for the list of outputs in square brackets. The outputs in the list are node voltages or device currents separated by commas, for example:

NOISE_OUTPUT=[V(1), I(R3), V(Port2)]

The syntax entry:

INPUT_REFERRED_NOISE=[source]

specifies that the single node voltage or device current in square brackets is to be used as the source for an input-referred noise calculation, as in these examples:

INPUT_REFERRED_NOISE=[V(1)]

INPUT_REFERRED_NOISE=[I(R3)]

AC Calculation

On a line that is separate from the .LNA statement, the netlist can contain a PRINT AC statement of the form:

.PRINT AC list_of_outputs

to request the output of small-signal AC analysis that is calculated by the linear network analysis tool. The outputs in the list are node voltages or device currents separated by commas. See LNA-Associated AC Analysis for details.

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