40 N5186A MXG and X-Series SA Measurement Guide
Corrections
Corrections/De-embedding Using PathWave E7653APPC Software
Corrections/De-embedding Using PathWave E7653APPC Software
De-embedding is used to remove the effects of test fixtures and cabling from
the measurement results. De-embedding uses a model of the test fixture and
mathematically removes the fixture characteristics (cables, connectors and
other passive components) between the source and the device under test
(DUT). Once the desired topology has been characterized, its effects can be
removed from the output signal, moving the effective reference plane to the
point at which the power sensor was connected.
Blocks can be added from supported file formats (.s2p, .csv, .uflat) or by direct
measurement, using one of the supported power sensors (power meter,
spectrum analyzer, or a network analyzer).
Adding Fixture Blocks using s2p Files
Amplitude and phase can be corrected by adding multiple s2p files as Fixture
Blocks.
An s2p file (also known as a Touchstone file) is an ASCII text file used for
documenting the n-port network parameter data and noise data of linear
active devices, passive filters, passive devices, or interconnect networks. Each
record contains 1 stimulus value and 4 S-parameters (total of 9 values)
The first line in the figure below (# GHz DB R 50) designates:
— (GHz) designates the frequency in Hz, kHz, MHz, or GHz
— (S) the measurements are in S parameters (rather than Y or Z)
— (DB) the values are given in decibel/angle. Instead of DB, you can have RI
(real/imaginary) or MA (magnitude/angle)
— (50) the characteristic impedance is 50 ohms
1. Create s2p files in Notepad in the format shown above.
The MXG must have the E7653APPC PathWave Automatic Channel
Response Correction and S-parameter De-embedding license installed.
If there is not a first line header, the default format is GHz, S-parameters,
and magnitude/angle.
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