AN851 Datasheet, PDF (22/25 Pages) Silicon Laboratories – Si468X SCHEMATICS AND LAYOUT GUIDE

AN851
Figure 16. GUI Antenna Cap Graph for FM
The process stated below should be applied to three frequencies (Low, Mid and High) within a given band.
1. Initially use the Silicon Labs-recommended values for C1 (33pf) and L1 (56nh) shown in Figure 16.
ACVS
ID=V2
Mag=1 V
Ang=0 Deg
Offset=0 V
DCVal=0 V
RES
ID=R2
CAP
1
2
COAXI2
ID=CX2
Z=50
L=6500 mil
K=2.1
A=0.0833
CAP
ID=C1
C=33 pF
IND
ID=L1
L=56 nH
VHFI
IND
ID=L2
IND
ID=L3
1
CAP
2
CAP
ID=C8
C=10 pF
VHFSW
Figure 17. Antenna Interface with Module FE
22
Rev. 0.2