Trace Data Touchstone File
The Analyzer allows the user to save S-parameters to a Touchstone file. The Touchstone file contains the frequency values and S-parameters. The files of this format are typical for most of circuit simulator programs.
The *.s2p files are used for saving all the four S-parameters of a 2-port device.
The *.s1p files are used for saving S11 and S22 parameters of a 1-port device.
Only one (active) trace data are saved to the file.
| Note | If a channel does not have all the S-parameter traces, only available S-parameter responses will be represented. For example, if one S11 trace is enabled, S21 response will be represented, and S12 and S22 will not be represented. The missing S-parameters are displayed as zeroes in the file. | |
|---|---|---|
The Touchstone file saving function is applied to individual channels. To use this function, first activate the channel.
The Touchstone file contains comments, header, and trace data lines. Comments start from «!» symbol. Header starts from «#» symbol.
The *.s1p Touchstone file for 1-port measurements:
| ! Comments | ||||||||
|---|---|---|---|---|---|---|---|---|
| # Hz S FMT R Z0 | ||||||||
| F[0] | {S11}’ | {S11}” | ||||||
| F[1] | {S11}’ | {S11}” | ||||||
| . . . | ||||||||
| F[N] | {S11}’ | {S11}” |
The *.s2p Touchstone file for 2-port measurements:
| ! Comments | ||||||||
|---|---|---|---|---|---|---|---|---|
| # Hz S FMT R Z0 | ||||||||
| F[0] | {S11}’ | {S11}” | {S21}’ | {S21}” | {S12}’ | {S12}” | {S22}’ | {S22}” |
| F[1] | {S11}’ | {S11}” | {S21}’ | {S21}” | {S12}’ | {S12}” | {S22}’ | {S22}” |
| . . . | ||||||||
| F[N] | {S11}’ | {S11}” | {S21}’ | {S21}” | {S12}’ | {S12}” | {S22}’ | {S22}” |
Hz – frequency measurement units (kHz, MHz, GHz)
FMT – data format:
- RI – real and imaginary parts,
- MA – linear magnitude and phase in degrees,
- DB – logarithmic magnitude in dB and phase in degrees.
Z0 – reference impedance value
F[n] – frequency at measurement point n
{…}’ – {real part (RI) | linear magnitude (MA) | logarithmic magnitude (DB)}
{…}” – {imaginary part (RI) | phase in degrees (MA) | phase in degrees (DB)}
Touchstone File Saving/Recalling
| To select the saving type, use the following softkeys: | ||
|---|---|---|
| For 1-port saving type select the port number using the following softkeys: | ||
| To select the data format, use the following softkeys: | ||
| To save file to the hard disk, use the following softkeys: |