KTA1550 AC Response Test Procedure Technical Article 01
December 19, 2017 Kinetic Technologies Page 2 of 14
Introduction
The purpose of this document is to outline the instrumentation and test procedure to measure
Common Mode Rejection, Return Loss, and Insertion Loss for the KTA1550 dual channel EMI
and ESD suppressor IC intended for ethernet applications.
The KTA1550 evaluation board is capable of being configured to control the device in any
operation mode and accommodates common mode rejection, return loss, and insertion loss
measurements. Specific evaluation board components must be placed or removed to configure
the board for each AC response measurement. The evaluation board top layer assembly
drawing in Figure 1 shows component locations. Refer to the specific measurement
instructions for component placement requirements.
Required Equipment
The following equipment is required to perform measurements outlined in this document:
1. Vector Network Analyzer (VNA), minimum range of 0.1MHz to 300MHz required. For
measurements outlined in this document, an HP8753E 30kHz to 6GHz VNA was used.
2. Instrument grade 1.5ft. SMA to SMA, 50Ω coaxial test cables, 2 required.
3. 6-inch or shorter SMA to SMA 50Ω coaxial cables, 4 required.
4. VNA calibration kit, HP85033D 3.5mm calibration kit or equivalent calibration kit VNA in
use.
5. Lab Bench Power Supply, Agilent/Keysight E3631A or equivalent DC power supply.
6. KTA1550 Evaluation Board, Revision 1-170915.
7. KTA1550/52 Balun Fixture, 2 required.
a. An unbalanced to balanced line transformer is required to connect the single
ended VNA ports to the differential ethernet line I/O of the KTA1550 EVB. The
transformer should have a 1:2 impedance ratio to match the 50Ω VNA
source/termination impedance to the 100Ω ethernet line termination impedance.
b. The KTA1550/52 balun test fixture utilizes a North Hills 0319NA 1:2 unbalanced
to balanced line transformer. This transformer has a maximumly flat response
from 100kHz to 100MHz with than 0.1dB of insertion loss. The KTA1550/52
balun test fixture uses SMA type connector.
c. Other unbalanced to balanced line RF transformers may be used, but must
demonstrate equal or better electrical characteristics.