[hpsdr] Ground planes with multiple parts in both analog and digital domains

[mj.hamel at verizon.net]

Others may have a different take on this but I strongly recommend one big continuous ground plane, and control current paths by component placement. Split planes work OK for audio and LF but with mixed analog and digital and RF definitely go with a full ground plane.

YMMV

Mike 
WO1U



>From: Howard Long <hlong at btinternet.com>
>Date: 2008/02/25 Mon AM 09:02:11 CST
>To: hpsdr at lists.hpsdr.org
>Subject: [hpsdr] Ground planes with multiple parts in both analog and	digital domains

>***** High Performance Software Defined Radio Discussion List *****
>
>Folks
>
>Traditionally with a signle device such as a CODEC straddling the analog and
>digital domains, there seems to be a fairly uniform agreement to use a
>common ground plane with an insulating split between analog and digital
>sections of the board and a single connection under the CODEC.
>
>How do you deal with a situation where there are multiple devices in both
>the digital and analog domains?
>
>I have read this article
>http://www.google.com/search?hl=en&q=mixed+signal+pcb+layout that seems to
>suggest the use of a single unsplit ground while maintaining physical
>partitioning between the mixed signal/analog devices and their digital
>counterparts.
>
>I wonder if anyone has any views on this? In my particular case I have a
>CODEC, a DDS and a PLL/VCO to deal with using I2S/I2C/SPI interfaces to a
>DSP.
>
>73, Howard G6LVB
>
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