Chapter 4. PCB Layout Design
4.11.4 4. TX performance is not bad, but the RX sensitivity is low.
Analysis: Good TX performance indicates proper RF impedance matching. Poor RX sensitivity may result from
external coupling to the antenna. For instance, the crystal signal harmonics could couple to the antenna. If the TX
and RX traces of UART cross over with RF trace, they will aect the RX performance, as well. If there are many
high-frequency interference sources on the board, signal integrity should be considered.
Solution: Keep the antenna away from crystals. Do not route high-frequency signal traces close to the RF trace.
Please refer to Section RF for details.
Espressif Systems 38
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