325
525
725
925
1130
1330
1530
1730
4
6
8
10
12
14
16
18
20
Q Value
Resistance (
)
W
680.71
1300
R
PAR
42E-12
52E-12
62E-12
72E-12
82E-12
92E-12
102E-12
4
6
8
10
12
14
16
18
20
Q Value
Capacitance (pF)
68E-12
82E-12
97E-12
51E-12
C
PAR
C
SER
www.ti.com
Antenna Tuning Details
The calculations and simulations for a desired Q range of 5 to 20 result in the graphs shown in
and
, which indicate the required resistor and capacitance values that should be populated.
Figure 10. Theoretical Parallel Resistor Value for Desired Q
Figure 11. Theoretical Capacitance Values for Resonance at Desired Q
17
SLOU297 – October 2010
TRF7960TB HF RFID Reader Module
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