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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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SI4785 Arkusz danych(PDF) 7 Page - Silicon Laboratories |
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SI4785 Arkusz danych(HTML) 7 Page - Silicon Laboratories |
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7 / 69 page  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 |
Podobny numer części - SI4785 |
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Podobny opis - SI4785 |
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