noiseParameters

Extract noise data from Touchstone file or build noise figure data

Since R2022a

Description

Use the noiseParameters object to extract noise data from Touchstone file or build noise data from a noise figure data. You can also use this object to set the NoiseData property in the amplifier object.

Creation

Syntax

np = noiseParameters(filename)

np = noiseParameters(fmin,freq,z0)

Description

np = noiseParameters(filename) creates a noise parameters object np from the noise data in the two-port Touchstone file specified by filename.

np = noiseParameters(fmin,freq,z0) creates a noise parameters object np and sets the Fmin and Frequencies properties with the reference impedance z0.

Input Arguments

filename — Name of two-port Touchstone file

string scalar | character vector

Name of the two-port Touchstone file from which to extract noise data, specified as a string scalar or character vector.

Example: np = noiseParameters('default.s2p')

z0 — Reference impedance

real scalar

Reference impedance, specified as a real scalar in ohms. z0 must be equal to the reference impedance of the network parameters.

Example: np = noiseParameters(fmin,freq,z0)

Properties

Frequencies — Noise frequencies

column vector

Noise frequencies, specified as a column vector in Hz.

Example: np.Frequencies=(2:2:22)*1e9

Fmin — Minimum noise figure

column vector

Minimum noise figure, specified as a column vector in dB.

Example: np.Fmin=2:10

GammaOpt — Source reflection coefficient

complex column vector

Source reflection coefficient to realize the minimum noise figure, specified as a complex column vector. You cannot set this property when creating the object. You can modify the property once you have created the object using dot notation.

Example: np.GammaOpt=[2+j*5; 7; 3+j*9]

Rn — Effective noise resistance

column vector

Effective noise resistance normalized to the same resistance as the network parameters, specified as a column vector in ohms. You cannot set this property when creating the object. You can modify the property once you have created the object using dot notation.

Example: np.Rn=[2:10]

Object Functions

amplifier

Create two-port amplifier element

Examples

Extract Noise Data from Touchstone File

Extract the noise data from a touchstone file.

np = noiseParameters('default.s2p')

np = 
  noiseParameters with properties:

    Frequencies: [9x1 double]
           Fmin: [9x1 double]
       GammaOpt: [9x1 double]
             Rn: [9x1 double]

Add this noise data to an amplifier object.

a = amplifier(FileName='default.s2p',NoiseData=np)

a = 
  amplifier: Amplifier element

              Name: 'Amplifier'
    UseNetworkData: 1
          FileName: 'default.s2p'
       NetworkData: [1x1 sparameters]
         NoiseData: [1x1 noiseParameters]
              OIP2: Inf
              OIP3: Inf
          NumPorts: 2
         Terminals: {'p1+'  'p2+'  'p1-'  'p2-'}

Build Noise Parameters from Measured NF Data

Define a measured noise figure (NF), noise frequencies, and the reference impedance data.

NF = [4 3 2 2 2 2 2 2.5 2.5 3 3.5];
freqs = (2:2:22)*1e9;
z0 = 50;

Build the noise parameters from the measured NF data.

np = noiseParameters(NF,freqs,z0);

Add this noise data to an amplifier object.

a = amplifier(FileName='default.s2p',NoiseData=np)

a = 
  amplifier: Amplifier element

              Name: 'Amplifier'
    UseNetworkData: 1
          FileName: ''
       NetworkData: [1x1 sparameters]
         NoiseData: [1x1 noiseParameters]
              OIP2: Inf
              OIP3: Inf
          NumPorts: 2
         Terminals: {'p1+'  'p2+'  'p1-'  'p2-'}

Version History

Introduced in R2022a