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PCB Precautions on routing voice channels

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Vonn

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Hi Guyes
Is there any precausions when routing voice channels of communication application PCB . I have designed a card but I hear noise when switch to voice channel at the same time data channels are working correctly
 

Hi,

You should keep analog and digital parts of your design separately. Use analog gnd and analog pwr for analog circuits and same for digital. Connect analog ground with digital gnd in only one point, same for power supply. Do not make loops. You should use 4 layer pcb, with two planes. Route digital traces over digital planes only, same for analog. Do not overlap analog plane over digital and vice-versa. If not possible (2 layer pcb), keep as far as possible voice traces from digital circuits, especially buses and clocks. Surround voice traces with copper connected to analog gnd.

Best,
/pisoiu
 

What is the most recommended tool for signal integrity ; I heard that @legro is the best but I want to make sure of that !
and for any signal integrity tool ; is it possible to set a settings on it to tell it that for example these pathes/tracks are speech and it's programmed to take into consideration the precautions of the routing of such signals ?
 

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