1. Introduction
This application note is intended to help users achieve the best 2.4 GHz RF match for targeted applications. It describes the details of
matching network design procedures and presents additional test results.
Thorough derivations of four different matching topologies are presented:
• A ladder 2-element LC match for up to 10 dBm power levels
• A ladder 4-element LCLC match for up to 20 dBm power levels
• A hybrid type match applying both discrete elements and a transmission line (LC-Tline-C) for up to 20 dBm power levels
• A parallel LC 2-element match for up to 13 dBm power levels
Readers simply seeking recommended values, topologies, and RF performance data should skip to
Appendix 2. 2.4 GHz RF Network
Schematics and Technical Data
.
The presented matches are tested with three EFR32 variants:
• 7x7 mm, 48-pin 2.4 GHz
• 5x5 mm, 32-pin 2.4 GHz
• 7x7 mm, 48-pin dual band
For example, the 7x7 mm, 48-pin 2.4 GHz-only version's package pinout is shown in the figure below. The 2.4 GHz RF pins are high-
lighted with a red box.
Figure 1.1. EFR32 2.4 GHz RF Pins
1.1 Related Literature
Related documentation includes:
•
AN923: EFR32 sub-GHz Matching Guide
•
AN928: EFR32 Layout Design Guide
•
AN933: EFR32 2.4 GHz Minimal BOM
•
AN0002.1: EFM32 and EFR32 Wireless Gecko Series 1 Hardware Design Considerations
AN930: EFR32 2.4 GHz Matching Guide
Introduction
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