Texas Instruments TRF1208-EVM, Руководство пользователя, Страница: 8 / 17

3 Test Setup Diagrams
This section includes general recommendations for S-parameter, noise figure, and two-tone OIP3 setup while
measuring the TRF1208 EVM.
3.1 S-Parameter Test Setup
(J4)
TRF1208
(J6)
TRF1208 EVM
(J5)
INP
INM
OUTM
OUTP
Vector Network Analyzer
Figure 3-1. S-Parameter Test Setup
Use the following guidelines for S-parameter measurement:
1. As Figure 3-1 shows, the S-parameter measurement is typically done using a Vector Network Analyzer
(VNA). For measuring the TRF1208 EVM, a 3-port VNA is recommended which can generate single-ended
and receive differential signals at the input and output ports of EVM respectively.
2. Before connecting the RF coax cables to the EVM, you must calibrate the VNA along with the cables using a
calibration kit.
3. Make sure the frequency sweep and output power level from the VNA is set within the linear operating range
of the TRF1208 devices. The resolution bandwidth (RBW) and dynamic range of the VNA can be adjusted to
give optimum sweep time for the measurement.
4. It is important to account for board trace losses at the input and output side of the device during gain
measurements. Figure 3-2 gives typical input and output trace losses measured on the EVM.
Test Setup Diagrams www.ti.com
8 TRF1208 Evaluation Module SBOU266 – SEPTEMBER 2021
Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated