Lpc2000

> Hello,
> 
>   I am currently in the middle of a design for the 2138. EMI is very
> important in the design. 
> 
>    Are you used multilayer boards? How about series resistors on all
> the lines (both input and output)? Do you have a resistor in series
> with the XTAL2 output? How about 100pF capacitors on all the I/O 
that
> goes off the board. What crystal frequency are you using? How about
> ferrites on all level transistion devices (like RS232 and such)?

we use double side board, the problem is not in the crystal 
definitely as if PLL is not enabled this noise is not generated
IIRC PLL works on 150-180 Mhz and the radio iterference is caused 
probably when PLL frequency pass through 108Mhz FM range

Best regards
Tsvetan
---
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