The plug-in uses metrology grade de-embedding algorithms to eliminate fixture effects on a DUT.
CMT offers 2xThrough (transmission measurement) and 1xReflect (reflection measurement) fixture removal support with three methods that fit different fixture configurations (See table below).
Method |
Description |
|---|---|
Ideal for fixtures having leading transmission lines with long electrical length or for higher frequency options. It supports both 2xThrough and 1xReflect. This method should be used when the electrical fixture length is greater than 4x the rise time. It is acceptable to have some impedance variations along the fixture length. |
|
The most accurate method in cases where signals passing through the fixture significantly overlap in time domain and are difficult to separate from each other. It supports both 2xThrough and 1xReflect. This method should be used when the electrical fixture length is greater than or close to 4x the rise time and there are no impedance variations along the fixture length. |
|
Bisection (Split in Half) |
Method can be used when the fixture has leading transmission lines with short electrical length and inadequate time domain resolution. This is the most basic method. It does not perform processing in time domain. Bisection method supports 2xThrough only. |
A description of the application of the methods is given in the table below.
Description or Case |
Time Gating |
Filtering |
Bisect (Split in Half) |
|---|---|---|---|
Description |
|||
Calculation base |
Time Domain |
Time-Frequency Model |
Frequency Domain |
Principle |
Traditional Time Domain Gating |
LMS Joint Estimation Algorithm |
Advanced Solver of Nonlinear Equations System |
Filtering properties |
YES |
YES |
NO |
Electrical fixture length more than 4 x Rise Time |
+ |
+ |
— |
Electrical fixture length less than 4 x Rise Time |
— |
— |
+ |
Electrical fixture length close to 4 x Rise Time |
— |
+ |
+ |
There are some impedance variations along fixture length |
+ |
— |
|
There are no impedance variations along fixture length |
— |
+ |
|
Rise time is 
0.8/Fmax, where Fmax — maximum frequency range of the analyzer during measurement. NC — not considered.
