phaseNoiseToJitter

Measure RMS phase jitter from phase noise data

Since R2020b

Syntax

[Jrms_rad,Jrms_deg] = phaseNoiseToJitter(PNFreq,PNPow)

[Jrms_rad,Jrms_deg, Jrms_s] = phaseNoiseToJitter(___,'Frequency',frequency)

Description

[Jrms_rad,Jrms_deg] = phaseNoiseToJitter(PNFreq,PNPow) returns the effective RMS phase jitter in radians and degrees from the phase noise frequency and power levels.

[Jrms_rad,Jrms_deg, Jrms_s] = phaseNoiseToJitter(___,'Frequency',frequency) also returns the effective RMS phase jitter in seconds when you specify the signal frequency in addition to the input arguments in the previous syntax.

Examples

Measure Effective RMS Phase Jitter from Phase Noise Profile

Use a signal of 100 MHz frequency. The phase noise profile is:

• -125 dBc/Hz at 100 Hz

• -150 dBc/Hz at 1 kHZ

• -174 dBc/Hz at 10 kHz

• -174 dBc/Hz at 200 MHz

Calculate the effective RMS phase jitter in radian, degree, and second using the phaseNoiseToJitter function.

PNFreq = [100,1e3,1e4,200e6];
PNPow = [-125,-150,-174,-174];
[Jrms_rad Jrms_deg  Jrms_sec] = phaseNoiseToJitter(PNFreq,PNPow,'Frequency',100e6)

Jrms_rad = 
4.0430e-05

Jrms_deg = 
0.0023

Jrms_sec = 
6.4346e-14

Input Arguments

PNFreq — Frequency points relative to fundamental frequency at which phase noise is calculated

real-valued vector

Frequency points relative to the fundamental frequency to which phase noise is calculated, specified as a real-valued vector in hertz.

Data Types: double

PNPow — Phase noise power at specified frequency offsets relative to fundamental frequency

real-valued vector

Phase noise power in 1-Hz bandwidth centered at the specified frequency offsets relative to the fundamental frequency, specified as a real-valued vector in dBc/Hz. The elements of PNPow correspond to the elements of PNFreq.

Data Types: double

frequency — Signal frequency

100e6 (default) | scalar

Signal frequency, specified as a scalar in hertz. Signal frequency is used to calculate the RMS phase jitter in seconds.

Data Types: double

Output Arguments

Jrms_rad — Effective RMS phase jitter in radians

scalar

Effective RMS phase jitter, returned as a scalar in radians.

Jrms_deg — Effective RMS phase jitter in degrees

scalar

Effective RMS phase jitter, returned as a scalar in degrees.

Jrms_s — Effective RMS phase jitter in seconds

scalar

Effective RMS phase jitter, returned as a scalar in seconds. To calculate Jrms_s, define the signal frequency using Name-Value pair arguments.

Version History

Introduced in R2020b