Re: Rigol caught with their pants down! (DS1052E Oscilloscope)

Article View: sci.electronics.design

Article #855

Back to sci.electronics.design Previous Next

#855

From: krw
Date: Mon, 20 Jul 2009 01:11

21 lines
1495 bytes

On Mon, 20 Jul 2009 07:52:09 +1000, "David L. Jones"
<altzone@gmail.com> wrote:

>a7yvm109gf5d1@netzero.com wrote:

<snip>

>> You corrected the number of PLLs in the FPGA, how do they get the
>> clocks' phases aligned?
>
>Beats me.
>Could be as simple as fixed tuned gate delay inside the FPGA, or could be 
>some more complex system that auto-calibrates perhaps.

Tuning gate delays in an FPGA doesn't work.  Routing is over half the
delay and there is no way to fix that part.  Every time you "wire" the
part it'll have a different routing and your delays will be off.
Indeed, the idea is to make sure you don't rely on placement or
routing.

<snip>

Technical Details

Message-ID: <9tg765516n6j1pirsvj2md4ej503d6sjo0@4ax.com>

Path: arc1-ca.pugleaf.net!g2news2.google.com!news3.google.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail

References:

<9ZD8m.24080$Qg6.2130@newsfe14.iad> <07025c9a-509e-471b-b3a0-8965c4f191b8@g19g2000vbi.googlegroups.com> <aAM8m.14055$8B7.9612@newsfe20.iad>

Show Full Headers

Complete Article Headers

X-Google-Language: ENGLISH,ASCII-7-bit
Path: arc1-ca.pugleaf.net!g2news2.google.com!news3.google.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: krw <krw@att.bizzzzzzzzzzz>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Rigol caught with their pants down! (DS1052E Oscilloscope)
Date: Sun, 19 Jul 2009 20:11:55 -0500
Lines: 22
Message-ID: <9tg765516n6j1pirsvj2md4ej503d6sjo0@4ax.com>
References: <9ZD8m.24080$Qg6.2130@newsfe14.iad> <07025c9a-509e-471b-b3a0-8965c4f191b8@g19g2000vbi.googlegroups.com> <aAM8m.14055$8B7.9612@newsfe20.iad>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Trace: individual.net 6HwDgI+eNA4FFI2O9ZTYZAGOPnMFMC9rZCxsB5VZybQnbDaV+e
Cancel-Lock: sha1:kM0z0T31f1CkV7ePQr7BY/TsgxE=
X-Newsreader: Forte Agent 5.00/32.1171

Reply to Parent Message