NXP Semiconductors
NFC Tandem User Manual
447202
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User manual
Rev. 0.2 — 17 August 2018
COMPANY PUBLIC
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3.2 Matching guide
The NFC Tandem reference design comprised of 2 matching/tuning areas, respectively
for PN7150/NTAG I
2
C
plus
, influencing each other.
Figure 3. NFC Tandem matching/tuning
3.2.1 Step 1 - Reader matching
•
Plug TX1 and TX2 to an NWA/NVA and enable the switching transistors (VBAT =
High/3V3/5V)
•
Just match like a "normal" reader matching using NWA / VNA
•
Define matching impedance to e.g. 30Ohms
•
Bandwitdh resistors serial or paralell (shown) possible
–
Parallel e.g. 10kOhms
–
Serial e.g. 1,8 Ohms