skrf.calibration.calibration.NISTMultilineTRL

class skrf.calibration.calibration.NISTMultilineTRL(measured, Grefls, l, er_est=1, refl_offset=None, ref_plane=0, gamma_root_choice='estimate', k_method='multical', c0=None, z0_ref=50, z0_line=None, *args, **kwargs)[source]

NIST Multiline TRL calibration.

Multiline TRL can use multiple lines to extend bandwidth and accuracy of the calibration. Different line measurements are combined in a way that minimizes the error in calibration.

At every frequency point there should be at least one line pair that has phase difference that is not 0 degrees or a multiple of 180 degrees otherwise calibration equations are singular and accuracy is very poor.

By default the reference impedance of the calibration is the characteristic impedance of the transmission lines. If the characteristic impedance is known reference impedance can be renormalized by giving z0_ref and z0_line. Alternatively if capacitance/length of the transmission line is given with c0 argument, characteristic impedance can be solved assuming that conductance/length is zero.

Algorithm is the one published in 0, but implementation is based on 1.

References

0
    1. DeGroot, J. A. Jargon and R. B. Marks, “Multiline TRL revealed,” 60th ARFTG Conference Digest, Fall 2002., Washington, DC, USA, 2002, pp. 131-155.

1
  1. Yau “On the metrology of nanoscale Silicon transistors above 100 GHz” Ph.D. dissertation, Dept. Elec. Eng. and Comp. Eng., University of Toronto, Toronto, Canada, 2011.

Attributes

T_matrices

Intermediate matrices used for embedding and de-embedding.

biased_error

Estimate of biased error for overdetermined calibration with multiple connections of each standard.

caled_ntwk_sets

Return a NetworkSet for each caled_ntwk, grouped by their names.

caled_ntwks

List of the corrected calibration standards.

coefs

Dictionary or error coefficients in form of numpy arrays.

coefs_12term

Dictionary of error coefficients for 12-term Model.

coefs_12term_ntwks

Dictionary or error coefficients in form of Network objects.

coefs_3term

Dictionary of error coefficients for One-port Error model.

coefs_3term_ntwks

Dictionary of error coefficients in form of Network objects.

coefs_8term

Dictionary of error coefficients for 8-term (Error-box) Model.

coefs_8term_ntwks

Dictionary of error coefficients in form of Network objects.

coefs_ntwks

Dictionary of error coefficients in form of Network objects.

er_eff

Effective permittivity of the solved line.

error_ntwk

The calculated error Network or Network[s].

family

frequency

Frequency object of the calibration.

gamma

Propagation constant of the solved line.

measured_unisolated

measured_unterminated

normalized_directivity

Directivity normalized to the reflection tracking.

nstandards

Number of ideal/measurement pairs in calibration.

nstd

Normalized standard deviation of the calibration error.

output_from_run

Return any output from the run().

residual_ntwk_sets

Returns a NetworkSet for each residual_ntwk, grouped by their names.

residual_ntwks

Dictionary of residual Networks.

total_error

Estimate of total error for overdetermined calibration with multiple connections of each standard.This is the combined effects of both biased and un-biased errors.

unbiased_error

Estimate of unbiased error for overdetermined calibration with multiple connections of each standard.

verify_12term

verify_12term_ntwk

z0

Solved characteristic impedance of the transmission lines.

Methods

__init__

NISTMultilineTRL initializer.

apply_cal

Apply correction to a Network.

apply_cal_to_all_in_dir

Apply correction to all touchstone files in a given directory.

apply_cal_to_list

Apply correction to list of dict of Networks.

apply_cal_to_network_set

Apply correction to a NetworkSet.

embed

from_coefs

Create a calibration from its error coefficients.

from_coefs_ntwks

Create a calibration from its error coefficients.

load_calibration_archive

plot_caled_ntwks

Plot corrected calibration standards.

plot_errors

Plot biased, unbiased and total error in dB scaled.

plot_residuals

Plot residual networks.

pop

Remove and return tuple of (ideal, measured) at index.

remove_and_cal

Remove a cal standard and correct it, returning correct and ideal.

renormalize

Renormalizes the calibration error boxes to a new reference impedance.

run

Run the calibration algorithm.

save_calibration

save calibration as an archive containing the standards, parameters and calibration results

terminate

Terminate a network with switch terms.

unterminate

Unterminates switch terms from a raw measurement.

update_coefs

Update current dict of error coefficients.

write

Write the Calibration to disk using write().