This document is an application note on adjacent channel rejection measurements for the STM32W108 platform. It describes a method that could be used to characterize the adjacent channel rejection (ACR) on RF chips and compares it with other methods used by different manufacturers.
This document explains how to characterize adjacent channel rejection (ACR) on the STM32W108 platform. It details the IEEE 802.15.4-2003 standard requirements for receiver jamming resistance and defines the specific test conditions, including signal levels and channel definitions.
The note compares different interferer signal generation methods, specifically contrasting ideal 802.15.4 signals with heavily filtered signals often used by other manufacturers. It argues that filtered signals do not represent real-world scenarios and can lead to misleading performance figures, concluding that only ideal signals and CW tones provide unambiguous results for IC comparison.
| Minimum adjacent channel rejection | 0 dB |
|---|---|
| Minimum alternate channel rejection | 30 dB |
| Target frequency band | 2450 MHz |
The only unambiguous interferer signal waveforms to use for IC comparison are an ideal 802.15.4 signal and a CW tone.
The use of a filtered 15.4 signal is not representative of a real world scenario and is not well enough specified to ensure consistency between manufacturers.