Hello everyone,
I have a problem with the wifi and Bluetooth interfering with the speakers in the recent board i designed which causes a harsh and disturbing noise every time the controller attempts to connect with the wifi or Bluetooth device.
Is there any suggestion or viable solution to eliminate or mitigate the problem?
here is some description:
- the board contains arm-cortex MCU, ESP32 wifi-Bluetooth module, and MP3 player module next to ESP32 but not facing the antenna.
- the audio output is separated from the ESP32 with around 4 cm of distance and routed on the Top, and the audio signal gets amplified by a tda2230 power amplifier.
- Double side with ground planes on both sides connected using stretching vias.
- SPI and I2C signals are matched in length and with continuous grand plane underneath.
I have a problem with the wifi and Bluetooth interfering with the speakers in the recent board i designed which causes a harsh and disturbing noise every time the controller attempts to connect with the wifi or Bluetooth device.
Is there any suggestion or viable solution to eliminate or mitigate the problem?
here is some description:
- the board contains arm-cortex MCU, ESP32 wifi-Bluetooth module, and MP3 player module next to ESP32 but not facing the antenna.
- the audio output is separated from the ESP32 with around 4 cm of distance and routed on the Top, and the audio signal gets amplified by a tda2230 power amplifier.
- Double side with ground planes on both sides connected using stretching vias.
- SPI and I2C signals are matched in length and with continuous grand plane underneath.
Attachments
-
239.8 KB Views: 9