AN851 Datasheet, PDF (21/25 Pages) Silicon Laboratories – Si468X SCHEMATICS AND LAYOUT GUIDE

AN851
ACCS
ID=I2
RES
ID=R3
2
IMPED
ID=X1
1
IND
ID=L9
IND
ID=L10
1
CAP
2
CAP
ID=C12
C=10 pF
VHFSW
Figure 15. Parallel RLC
Optimization of Front End
Silicon Labs recommends using its EVB and the GUI to optimize the front end for a given antenna type and the
cable length. The GUI has an antenna graph function, shown in Figure 16, which exercises the internal varactor
capacitor across its range (1–128 counts) for finding the capacitance required to form resonance at a given
frequency.
Rev. 0.2
21