[quote user="Simon Attard"]
Hi all,
I am building a wireless audio system using an AIC3254 audio codec and a Bluetooth module. I am having a problem because of RF interference from the Bluetooth module. I have tried shielding the audio codec using a grounded steel container, but this did not help at all.
I was wondering if there was anybody who have had a similar problem in the past. What is the best way to tackle this issue?
Thanks in advance.
Simon
[/quote]
Hi Simon,
RF interference problems can be debiltating. A good ground reference plane, good shielding, analogue ground planes decoupled via ferite beeds may solve the problem ... but really having the intereference next to a very small signal, generally will cause problems with interference. You may want to check out some of the publications on X2Y feedthru capacitors, that may solve your problems in conjuction with above mentioned suggestions. I belive AVX and others do X2Y with Yageo etc. specifically for serious interference due to RF radios. Careful PCB layout will probably be necessary to get the most effective results, but there is never just one killer solution ... You may also look into synchronous audio sampling to ensure that audio sampling is done only during radio dead-time do avoid RF trasnmissions just as you sample audio, but this may be difficult if you cannot control your radio transmissions synchronously with your audio ...
hope this helps somewhat, cheers, Mike