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juan_vegag
Newbie
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Registered: ‎03-19-2018

Zynq-7000Q Decoupling

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Hi!,

 

I'm doing decoupling analysis for the Zynq-7000Q, specifically XQ7Z045-1RF900Q.  I know there's on-die capacitance for high frequencies ... but I haven't been able to find technical data about it.  So my question is:  Up to what frequency do we need to decouple to?  At what point does the internal decoupling take over?  Please let me know.  Thanks!

 

Best Regards,

- J. Vega

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austin
Scholar
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Registered: ‎02-27-2008

Follow the pcb guide:

 

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj044GXjvvZAhVEwlQKHZa8B9EQFggnMAA&url=https%3A%2F%2Fwww.xilinx.com%2Fsupport%2Fdocumentation%2Fuser_guides%2Fug483_7Series_PCB.pdf&usg=AOvVaw1JBQGpUMJQ448J0YasV...

 

Generally speaking, the on package decoupling does not 'solve' the high frequency decoupling:  additional decoupling is still required (although less than what would otherwise be required if those capacitors were not there).

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose

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austin
Scholar
Scholar
2,027 Views
Registered: ‎02-27-2008

Follow the pcb guide:

 

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj044GXjvvZAhVEwlQKHZa8B9EQFggnMAA&url=https%3A%2F%2Fwww.xilinx.com%2Fsupport%2Fdocumentation%2Fuser_guides%2Fug483_7Series_PCB.pdf&usg=AOvVaw1JBQGpUMJQ448J0YasV...

 

Generally speaking, the on package decoupling does not 'solve' the high frequency decoupling:  additional decoupling is still required (although less than what would otherwise be required if those capacitors were not there).

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose

View solution in original post

juan_vegag
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Registered: ‎03-19-2018

Ok.  Thanks for the reply!

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juan_vegag
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Newbie
1,571 Views
Registered: ‎03-19-2018

I found this other guide which I think is more suitable for the Zynq FPGA.

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