Spartan-6 MGT/GTP power supply

Hello,

I am going to use the 4 of the GTP interfaces. I calculated I need a
dedicated,2V@3A supply.

I checked the EVB from Avnet for the Spartan-6 150T and they implemented
two options: whether a switching relator LMZ from National whether a
TPS54317 LDO from TI. I like the LMZxxxx solution because the design is
simple and my PCB is already pretty busy.

It seems the maximum ripple voltage on the MGT supply is only 10mV so that
perhaps I should use a LDO low noise regulator for a correct operation of
those high speed interfaces? (I can't use electrolytics Capacitors because
of a mezaninne card.)

Do you think I can reach such a low output ripple with this switching
regulator?
Has anybody has some experience about that?

 

Thanks.

	   
					
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>Hello,
>
>I am going to use the 4 of the GTP interfaces. I calculated I need a
>dedicated,2V@3A supply.
>
>I checked the EVB from Avnet for the Spartan-6 150T and they implemented
>two options: whether a switching relator LMZ from National whether a
>TPS54317 LDO from TI. I like the LMZxxxx solution because the design is
>simple and my PCB is already pretty busy.
>
>It seems the maximum ripple voltage on the MGT supply is only 10mV so
that
>perhaps I should use a LDO low noise regulator for a correct operation of
>those high speed interfaces? (I can't use electrolytics Capacitors
because
>of a mezaninne card.)
>
>Do you think I can reach such a low output ripple with this switching
>regulator?
>Has anybody has some experience about that?
>
> 
>
>Thanks.
>
>	   
>					
>---------------------------------------		
>Posted through http://www.EmbeddedRelated.com
>

Suggest you repost to:
http://forums.xilinx.com/t5/Spartan-Family-FPGAs/bd-p/Spartan
	   
					
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Posted through http://www.EmbeddedRelated.com