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Impedance Characteristic Evaluation
of SMD by Using the ENA with
Inter-Continental Microwave (ICM)
Test Fixture
Application Note 1463-5
With the trend of wireless communications and digital equipment operating
Introduction at higher frequencies, the need to evaluate RF components under higher
and wider frequencies is becoming increasingly important. Generally, an
RF impedance analyzer is used for impedance measurement up to 3 GHz;
however, beyond this frequency range, a network analyzer is commonly used.
The network analyzer is a convenient instrument for measuring impedance
over a wide frequency range, but measurement accuracy is degraded in
comparison with the RF impedance analyzer1. This application note
describes impedance characteristic evaluation of SMD by using the ENA RF
network analyzer with the ICM test fixture. In addition, we also explain the
TRL calibration procedure using the ENA with ICM test fixture (TF-3001-S),
special considerations for measuring surface-mount devices (SMD), and
impedance characteristic evaluation using the impedance parameter
display software.
1. For information on the comparison between
an impedance analyzer and a network
analyzer, refer to reference application
note 1369-2
2
This section describes the TRL Calibration procedure using the ENA, ICM
TRL Calibration test fixture (TF-3001-S), and TRL calibration kit (TRL-3004B).
Procedures
Figure 1 shows the ICM test fixture mainframe (TF-3000 Series) and the
calibration kit (TRL-3004B).
Figure 1. Test fixture mainframe (TF-3000 Series) and calibration kit (TRL-3004B)
Step 1. Setting of the ENA
Before performing the TRL error correction, basic measurement parameters
such as test frequency range, IFBW, power level, and measurement points
should be set in advance. Please note that if you change measurement
parameters such as test frequency range after performing error correction,
the calibration data will be changed to compensation data, and this may
degrade measurement accuracy. In the case of the ENA, once calibration
data is changed to compensation data, status display "Cor", which is located
on the bottom-right corner of the screen, will be changed to "C?".
3
Step 2. Define the calibration kit
To ensure an accurate calibration, it is very important that the standard
coefficient of the calibration kit (TRL-3004B) be entered in the ENA. The
standard coefficient is provided with the calibration kit and each data item
should be entered correctly. Table 1 shows examples of standard coefficient
definitions.
Table 1. Examples of standard coefficient definitions (TRL-3004B)
Standard Offset Frequency Standard
(GHz) label
No. Type Delay Z0 Loss Lower Upper
ps G/s
1 Short