TX_OUT
Pin 5
L1
L2
C2 and C3
Combination
C4, C5, and C7
Combination
C8, C9, C10, and C11
Combination
50
W
(4.00 + j0.00)
at 13.6 MHz
W
Z
L
3.0 nF
150.0 nH
1.2 nF
330.0 nH
256.0 pF
Z
IN
60
SLOS757G – DECEMBER 2011 – REVISED MARCH 2020
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Applications, Implementation, and Layout
Copyright © 2011–2020, Texas Instruments Incorporated
Figure 7-2. Impedance Matching Circuit
This yields the following Smith Chart simulation.
Figure 7-3. Impedance Matching Smith Chart
Resulting power out can be measured with a power meter, spectrum analyzer with power meter function,
or other equipment capable of making a "hot" measurement. Take care to observe maximum power input
levels on test equipment and use attenuators whenever available to avoid any possibility of damage to
expensive equipment.
lists the expected output power levels under various operating conditions.
7.2.3
Reader Antenna Design Guidelines
For HF antenna design considerations using the TRF7962A, see the following documentation:
Antenna Matching for the TRF7960 RFID Reader
TRF7960TB HF RFID Reader Module User's Guide
, with antenna details at end of manual