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SI4713 Datasheet(PDF) 7 Page - Silicon Laboratories

No. de pieza SI4713
Descripción Electrónicos  Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES
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SI4713 Datasheet(HTML) 7 Page - Silicon Laboratories

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AN383
Rev. 0.8
7
2.2. Emissions Mitigation Components
The following components may be placed to reduce VCO emissions. This is only required if regulatory testing
requires measuring emissions at the VCO frequency of 3–4 GHz. Refer to Section “2.6.1. Emissions Mitigation
Checklist” for detailed layout and grounding recommendations pertaining to the components described below.
2.2.1. FMI Mitigation Components
C5 (NP) is an optional filter capacitor for FMI pin 2 and may be placed to shunt VCO energy to GND and prevent it
from radiating from an antenna connected to the FMI pin. This pad is a placeholder for alternate emission
mitigation option 2. While it is recommended to select option 1 for best sensitivity and mitigation performance,
leaving this pad ensures that there is no redesign necessary between options. Route pin 2 to GND/RFGND if the
pin functionality is not used.
F1 (BLM15GA750SN1) is an optional bead for FMI pin 2 and may be placed to prevent VCO energy from radiating
from FMI pin. Place F1 as close as possible to FMI pin 2. Route pin 2 to GND/RFGND if the pin functionality is not
used.
C14 (6 pF) is an optional filter capacitor for FMI pin 2 and may be placed to shunt VCO energy to GND and prevent
it from radiating from an antenna connected to the FMI pin. Place C14 as close as possible to FMI pin 2. The
ground path should be optimized on the top layer. Route pin 2 to GND/RFGND if the pin functionality is not used.
2.2.2. AMI Mitigation Components
C17 (3.3 pF) is an optional filter capacitor for AMI pin 4 on Si473x devices and may be placed to shunt VCO energy
to GND and prevent it from radiating from an antenna connected to the AMI pin. Place C17 as close as possible to
AMI pin 4 and RFGND pin 3. The ground path should be optimized on the top layer. Route pin 4 to GND/RFGND if
the pin functionality is not used.
L2 (10 nH) is an optional filter inductor for AMI pin 4 on Si473x devices and may be placed to prevent VCO energy
from radiating from AMI pin. Place L2 as close as possible to AMI pin 4. Route pin 4 to GND/RFGND if the pin
Table 2. FMI Mitigation Components
Option
Components
Sensitivity
Mitigation
Cost
1C5 = NP
F1 = BLM15GA750SN1
C14 = 6 pF
Best
Best
Higher
2C5 = 2.7 pF
F1 = 20 nH
C14 = 2.7 pF
Less
(+1.75 dB vs Option1)
Good
Lower
Table 3. AMI Mitigation Components
Option
Components
Sensitivity
Mitigation
Cost
1
C17 = 3.3 pF
L2 = 10 nH
C16 = 3.3 pF
Best
Good
Lower
2
C17 = 2.7 pF
L2 = 20 nH
C16 = 2.7 pF
Less
(+3 dB vs Option1)
Better
Lower
3C17 = NP
L2 = BLM15GA750SN1
C16 = NP
Least
(+6 dB vs Option1)
Best
Higher


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