S-Parameters Files

Presentation

Only S2P files are measured and exported by IQSTAR. The extension of files is .s2p.
This file is divided in two parts:
  • Header: contains information about measurement
  • Content: contains measurement values
Note: S-Parameters files contains only one measurement. To append measurements, use IQSTAR Measurement Files.
Important: Other SnP files (S1P, S3P and S4P) are not measured but they are still read by the wwhiteboard.

Header Information

This part contains the information about measurement. All header lines start with a !.

!!Title of measurement q_Vgate1=0V, q_Igate1=0A
! Measurement program: Measurement Program name
! Operator: Operator name
! Laboratory: Laboratory name
! Device: Device name
! Device description: Device description
! Device family: Amplifier
! Device type: HPA
! Transistor class: T class
! Transistor periphery: 2.0 mm
! Date: 2024/03/11 14:50:08
! Quiescent command: Vin=+0.00000E+00, Vout=+0.00000E+00, Vaux1=+0.00000E+00, Vaux2=+0.00000E+00, Vaux3=+0.00000E+00
! Quiescent point: Vin=+0.00000E+00, Iin=+0.00000E+00, Vout=+0.00000E+00, Iout=+0.00000E+00, Vaux1=+0.00000E+00, Iaux1=+0.00000E+00, Vaux2=+0.00000E+00, Iaux2=+0.00000E+00, Vaux3=+0.00000E+00, Iaux3=+0.00000E+00
! Pulse point: Vin=+0.00000E+00, Iin=+0.00000E+00, Vaux1=+0.00000E+00, Iaux1=+0.00000E+00, Vaux2=+0.00000E+00, Iaux2=+0.00000E+00
! Access: ref=Input, name=Gate1
! Access: ref=Output, name=Drain1
! Access: ref=Aux1, name=Gate2
! Access: ref=Aux2, name=Drain2
! Access: ref=Aux3, name=Driver Amplifier
! Thermal command: 20.0
! Thermal point: Monitor=+1.99869E+01, Tsensor1=+2.02588E+01, Tsensor2=+1.98145E+01, Psensor1=+2.01960E+06, Psensor2=+1.94621E+06
! Thermal sensor: ref=Monitor, name=Thermostat
! Thermal sensor: ref=Tsensor1, name=Tsensor 1
! Thermal sensor: ref=Tsensor2, name=Tsensor 2
! Thermal sensor: ref=Psensor1, name=Psensor 1
! Thermal sensor: ref=Psensor2, name=Psensor 2
Here, are stored all information about measurement filled from the software:
measurement_info

Note:
  • All values are defined in the Metric System except unit of the transistor periphery, that must be in millimeter.
  • Custom access name is defined by the line Access : ref=PredefinedName, name=CustomName. But information about the access use always the predefined suffix:
    • Values of Input are defined by the suffix in (e.g. Vin, Iin)
    • Values of Output are defined by the suffix out (e.g. Vout, Iout)
    • Values of AuxiliaryN are defined by the suffix auxN with N is the number of the auxiliary (e.g. Vaux1, Iaux1, Vaux2, Iaux2)

Content

This part contains measurement values.

# GHZ S MA R 50.0
2.000000E+00 +9.769000E-01 -1.343000E+01 +1.036000E-01 +7.318000E+01 +1.028000E-01 +7.420000E+01 +8.375000E-01 -1.221000E+01
3.000000E+00 +9.713000E-01 -2.055000E+01 +1.525000E-01 +6.775000E+01 +1.531000E-01 +6.831000E+01 +8.381000E-01 -1.917000E+01
4.000000E+00 +9.604000E-01 -2.686000E+01 +1.994000E-01 +6.106000E+01 +1.996000E-01 +6.176000E+01 +8.328000E-01 -2.496000E+01
  1. Option line
    The first line of the this part defines how data will be write:
    # <frequency unit> <parameter> <format> R <n>
    Where:
    • #: marks the beginning of the option line
    • frequency unit: specifies the unit of frequency. Allowed values are GHz, MHz, KHz, Hz. The default value is GHz.
    • parameter: specifies what kind of data is contained in the file. Allowed values are:
      • S for Scattering parameters (default)
      • Y for Admittance parameters
      • Z for Impedance parameters
    • format: specifies the format of data pairs. Allowed values are (angles are given in degrees):
      • RI for real-imaginary (default)
      • DB for dB-angle (dB = 20*log10|magnitude|)
      • MA for magnitude-angle
    • R n: specifies the reference resistance in ohms where n represents the normalized impedance in ohms. The default value is 50 ohms
  2. Data line 
    <frequency value> <N11> <N21> <N12> <N22>
    Where:
    • frequency value: frequency value in unit defined by option line
    • N11 N21 N12 N22: data points, where Nxy represent pairs of data values
    All four pairs are required. Values from data lines are separated by white-space. All lines are arranged in increasing order of frequency.
    Important: The order in which data is wrote: ‘21’ data precedes ‘12’ data.