[SI-LIST] Re: AC DC SPEC FOR POWER PINS
- From: Zheng Edison <edisonzheng@xxxxxxxx>
- To: <ah.vinod@xxxxxxxxx>, SI-LIST <si-list@xxxxxxxxxxxxx>
- Date: Fri, 24 May 2013 13:45:24 +0800
Vinod, the voltage drop is divided Into two parts artificially :Ac drop and dc
drop. We can measure the maximum value of the total voltage drop. After that
we have to decide the proportions of ac and dc drop, which is not necessary
all the time. The proportions depend on the kind of power. For example, the pll
power is sensitive on ac drop, so We should distribute less proportion to ac
drop. But for power of I/O buffer, it's not necessary to make attention to the
proportions of ac and dc drop.
Edison
-----Original Message-----
From: vinod ah
Sent: 24 May 2013 05:03:16 GMT
To: SI-LIST
Subject: [SI-LIST] AC DC SPEC FOR POWER PINS
Hi All,
Have a very basic question on AC DC spec provided to power pins of an
ASIC/IO Controller.
I am working on PLL Characterisation and i find that supply voltage for
that PLL is from an Pin which is 1.2V powered. AC spec is +2% while DC
spec is +4%.
I assume that AC spec means ripple while DC spec means supply voltage
tolerance (not ripple).
So was wondering how is the AC DC spec derived in the first place?
Regards
Vinod A H
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