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[SI-LIST] [Question]Mixed Signal PCB
- From: ³²¼º¿± <bogus97@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Nov 2001 18:23:13 +0900 (KST)
<body bgcolor="white" text="black" link="blue" vlink="purple" alink="red">
<p style="margin-top:0px; margin-bottom:0px;">To Dear</p>
<p style="margin-top:0; margin-bottom:0;"> </p>
<p style="margin-top:0px; margin-bottom:0px;">When we design the mixed signal
PCB(analog device and digital device)</p>
<p style="margin-top:0px; margin-bottom:0px;">we often split the ground layer
into analog ground and digital ground with copper pour, or</p>
<p style="margin-top:0px; margin-bottom:0px;">don't split the ground layer.</p>
<p style="margin-top:0; margin-bottom:0;"> </p>
<p style="margin-top:0px; margin-bottom:0px;">My first question is that which
is better in this case?</p>
<p style="margin-top:0; margin-bottom:0;"> </p>
<p style="margin-top:0px; margin-bottom:0px;">According to Burr Brown Tech
article(related to ADC), In low speed system, We must split
the ground into analog and digital ground. But in high speed system, two
method(split or
not split) is all O.K.</p>
<p style="margin-top:0; margin-bottom:0;"> </p>
<p style="margin-top:0px; margin-bottom:0px;">My second question is that Why
two methods are allowed in high speed system ?</p>
<p style="margin-top:0px; margin-bottom:0px;">In my option, In high speed
system, we must split ground into analog and digital ground</p>
<p style="margin-top:0px; margin-bottom:0px;">because that we protect analog
signal from digital noise (ex ground bounce, and signal</p>
<p style="margin-top:0px; margin-bottom:0px;">return path, so on) I don't
understand the words in Burr Brown Tech article.</p>
<p style="margin-top:0px; margin-bottom:0px;"> </p>
<p style="margin-top:0; margin-bottom:0;">Please reply to me</p>
<p style="margin-top:0px; margin-bottom:0px;">Thank you for reading my
e-mail<br>
-------------------------------------------------- <br>
Computer Systems Lab Seoul National University <br>
Name : Nam Sung Yuep <br>
TEL : (02)880-8700,880-1836 <br>
E_Mail : bogus97@xxxxxxxxxxxxxxx <br>
bogus97@xxxxxxxxxxx <br>
adriano97@xxxxxxxxx <br>
-------------------------------------------------- <br>
H.P 019-532-2755</p>
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