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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim Oscillator Analysis >
   Oscillator Analysis Netlist Formats >
       .OSC Phase Noise Analysis Statement           

.OSC Phase Noise Analysis Statement

The Nexxim netlist syntax for phase noise analysis consists of extensions to the basic oscillator analysis.

.OSC TONES=val MAXK=val
NOISE_OUTPUT=[outputs] HARMONIC_NUMBER=val frequency_sweep

The TONES and MAXK entries can use either the single-tone format or the multi-tone format. See .OSC Single-Tone Statement and .OSC Multi-Tone Statement for details.

The NOISE_OUTPUT parameter specifies the noise outputs of interest. A noise output can be:

•  The voltage at a single node, format V(node), for example, V(n1).

•  The voltage differential between two nodes, format V(node,node), for example, V(n1,n2).

•  The current across a branch, format I(branch), for example, I(V1)

The HARMONIC_NUMBER parameter selects one of the harmonics of the oscillator frequency around which to calculate the phase noise. The default is harmonic number 1 (the fundamental oscillating frequency).

The entry frequency_sweep specifies a range of frequencies (offsets from the frequency specified by the HARMONIC_NUMBER parameter) to be applied in the analysis.

The frequency_sweep field has several formats.

The sweep can be just a single frequency value.

A second form of frequency_sweep 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 of the frequency_sweep field has the format:

freq_count_type numpoints startfreq stopfreq

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

LIN
Linear count 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 count 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 count 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 form of frequency_sweep has the format:

POI numpoints freq1 [freq2 ...]

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

The phase noise analysis can also include a sweep of temperature or any other parameter. See Variable Sweep for details.

Here are examples of .OSC Phase Noise statements:

.OSC TONES=1E10 MAXK=3 NOISE_OUTPUT=[V(1,2),V(NET_3),I(VD)]
+ HARMONIC_NUMBER=2 LIN 100 0.1 2E10

.OSC TONES=1E6 MAXK=3 NOISE_OUTPUT=[V(NET_3),I(VD)]
+ HARMONIC_NUMBER=1 LIN 10 0.5e6 2E6
+ SWEEP TEMP POI 5 15 20 25 30 35

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