skrf.calibration.deembedding.IEEEP370_SE_NZC_2xThru¶

class skrf.calibration.deembedding.IEEEP370_SE_NZC_2xThru(dummy_2xthru, name=None, z0=50, use_z_instead_ifft=False, verbose=False, forced_z0_line=None, *args, **kwargs)[source]¶

Creates error boxes from a test fixture 2xThru network.

Based on [ElSA20] and [I3E370].

A deembedding object is created with a single 2xThru (FIX-FIX) network, which is split into left (FIX-1) and right (FIX-2) fixtures with IEEEP370 2xThru method.

When Deembedding.deembed() is applied, the s-parameters of FIX-1 and FIX-2 are deembedded from the FIX_DUT_FIX network.

This method is applicable only when there is a 2x-Thru network.

Example

>>> import skrf as rf
>>> from skrf.calibration import IEEEP370_SE_NZC_2xThru

Create network objects for 2x-Thru and FIX_DUT_FIX

>>> s2xthru = rf.Network('2xthru.s2p')
>>> fdf = rf.Network('f-dut-f.s2p')

Create de-embedding object

>>> dm = IEEEP370_SE_NZC_2xThru(dummy_2xthru = s2xthru, name = '2xthru')

Apply deembedding to get the actual DUT network

>>> dut = dm.deembed(fdf)

Note

numbering diagram:

 FIX-1    DUT      FIX-2
 +----+   +----+   +----+
-|1  2|---|1  2|---|2  1|-
 +----+   +----+   +----+

Warning

There are two differences compared to the original matlab implementation [I3E370]:

FIX-2 is flipped (see diagram above)

A more robust root choice solution is used that avoids the apparition of 180° phase jumps in the fixtures in certain circumstances

References

[ElSA20]

Ellison J, Smith SB, Agili S., “Using a 2x-thru standard to achieve accurate de-embedding of measurements”, Microwave Optical Technology Letter, 2020, https://doi.org/10.1002/mop.32098

[I3E370]

https://opensource.ieee.org/elec-char/ieee-370/-/blob/master/TG1/IEEEP3702xThru.m, commit 49ddd78cf68ad5a7c0aaa57a73415075b5178aa6

Methods

`COM_receiver_noise_filter`	receiver filter in COM defined by eq 93A-20
`DC`
`__init__`	IEEEP370_SE_NZC_2xThru De-embedding Initializer
`dc_interp`	enforces symmetric upon the first 10 points and interpolates the DC point.
`deembed`	Perform the de-embedding calculation
`makeStep`
`makeSymmetric`	this takes the nonsymmetric frequency domain input and makes it symmetric.
`split2xthru`