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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Probes >
   Phase Noise Probe (PNP)       

Phase Noise Probe (PNP)

 

 


Properties

Description

Units

Default

Range

NAME

Probe name

None

Required

String

FMIN

Minimum measurement frequency

Frequency

100

[100, 1e6]/Real

WINDOW_TYPE

0 for Bartlett,

1 for Hanning,

2 for Rectangular,

3 for Hamming,

4 for Blackman,

5 for Blackman-Harris (3 term),

6 for Blackman-Harris (4 term)

7 for Gaussian (alpha=3),

8 for de la Valle-Poussin.

None

1

[0,8] /Integer

INITSAMP

Number of initial samples removed from waveform

None

0

[0, Inf)/Integer

RIN

Input impedance

Ohm

Inf

(0, Inf]/Real

Ports

Input

Input signal (real)

 

Notes

1. In general, this phase noise probe (PNP) takes the noise signal from the PN pin of the VCODI­VBYN (combined VCO and Frequency Divider component) and outputs the single side band noise spectrum. If you plot the data with the dB operation, the units will be dBc/Hz.

2. Due to the statistical nature of the noise simulation, the number of samples need to be simu­lated should be at least 10*fs/FMIN, where fs is the sampling rate. The more samples are sim­ulated, the more accurate the spectrum is. If not enough samples are sent, this model may not generate any plot, and the simulator will give a warning message saying not enough samples after the simulation is completed.

3. Normally, RIN should be set to 1ohm when measuring phase noise.

4. This probe always assumes the input signal is the base-band phase noise signal. If you want to measure the phase noise for a carrier signal, you need to extract the phase noise (e.g. using a complex multiplier) first, and then feed this extracted noise signal to the probe. Also note that you will have to remove the unwanted samples in a PLL simulation during the locking period

Netlist Form

PNP:NAME n1 [FMIN=val] [WINDOW_TYPE=val][INISTSAMP=val] [RIN=val]

Netlist Example

PNP:1 1 FMIN=100Hz WINDOW_TYPE=1 RIN=1ohm



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