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Port Matching...
2-port clamp de-embedding
Port impedance conversion...
Four-port fixture embedding/de-embedding
7.9.1.
Terms of Fixture Simulator
Fixture
The fixture refers to a device which is set between the tested device and cable and used to fix the tested device. The S-parameter is
the key to fixture embedding and de-embedding. However, it is difficult to determine the S- parameter. One of the current feasible
methods is to establish the fixture model by linear simulation or simulate the fixture with the three-dimensional electromagnetic
structure, and the other method is used to determine the fixture loss and delay time by means of port extension.
Touchstone data file (SnP file)
It is a data format created by EEsoft before purchase by HP, or widely known as the S2P format. If multiple ports are extended, the file
is generally known as the SnP file, where n represents the number of ports. The corresponding S-parameters of n ports are saved in
this file.
Circuit parameter model
The impedance of the components and circuits should be matched in the microwave component and circuit design phase. Generally,
the conjugate matching circuit is composed of the resistance (R), inductance (L), capacitance (C) and conductance (G) in the
impedance matching design. The parameter form of the conjugate matching circuit is referred to as the circuit parameter model.
7.9.2.
Enabling of Fixture Simulation Function
Menu path: [Calibration] > [Fixture simulator]. Click [Fixture ON/OFF] under [Fixture simulator]. Then this option will change into
[Fixture ON/OFF]. Thus the fixture simulator function is enabled (in this case, all the functions of the fixture simulator are effective). In
the default mode, this option is [Fixture ON/OFF], indicating that the fixture simulator function is shut down.
Fig. 7.20 Enabling of Fixture Simulation Function
7.9.3.
Port Matching...
This function is used to transform the original measurement results into one characteristic determined by inserting the matching circuit
between the DUT and test port (one-port). The inserted matching circuit is selected from the five preset circuit models or from the
circuits defined in the 2-port Touchstone file.
