If Range Correction; Ratio Calculation; Port Characteristics Correction; Sweep Averaging - Agilent Technologies ENA Series User Manual

General Principles of Operation
Data Processing

IF Range Correction

Input signals that went through ranging at the receiver are reverted (corrected) to previous
values before the ranging.

Ratio Calculation

The ratio between two signals is determined by performing divisions on complex numbers.

Port Characteristics Correction

The equivalent source match error, the directivity error, and the tracking error of each test
port bridge are corrected.

Sweep Averaging

The average of complex indices is determined based on data obtained from multiple sweep
measurements. Sweep averaging is effective in reducing random noise in measurements.

Raw Data Array

The results from all data processing done up to this point are stored in this array as raw
data. All prior data processing is performed as each sweep takes place. When the full
N-port error correction (N=2 to 4) is enabled, all 4 ´ N S parameters are stored in the raw
data array and used in error correction. The user is not allowed to access (read/write) this
raw data array.

Error Correction/Error Correction Coefficient Array

When error correction is enabled, the process eliminates the system errors that are
reproducible and stored in the error correction coefficient array (calibration coefficient
array). It accommodates everything from the simple vector normalization to the full
12-term error correction. The user is not allowed to access (read/write) this error correction
coefficient array.

Port Extension

This process carries out a simulation of adding or eliminating a variable length no-loss
transmission path on each test port so that the reference plane of calibration is moved. The
port extension is defined by an electrical delay (sec).

Fixture Simulator

A data conversion by the fixture simulator function is executed. The fixture simulator
function is a collective term for six different functions: balanced-unbalanced conversion,
addition of matching circuits, port reference impedance conversion, network elimination,
addition of differential matching circuits, and differential reference impedance conversion.

Corrected Data Array

Unlike the raw data array, this array stores the results obtained after error corrections, port
extensions, or the fixture simulator functions are applied. The user is allowed only to read
Appendix E 457