PCB layout for audio - Page 4 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th August 2007, 02:01 AM   #31
diyAudio Member
 
panson_hk's Avatar
 
Join Date: Aug 2005
Blog Entries: 10
a useful reference http://www.hottconsultants.com/pdf_f...ixedsignal.pdf
  Reply With Quote
Old 28th August 2007, 02:11 AM   #32
diyAudio Member
 
panson_hk's Avatar
 
Join Date: Aug 2005
Blog Entries: 10
Quote:
Originally posted by ilimzn


Even though we are talking audio frequencies here, some of the things that happen in an amp are way above that band - in particular half-wave rectification in output stages of class AB amps, correction signals for NFB loops, etc. At these frequencies, you need to consider the full current loop, not just the ground line part of it. A ground plane (properly implemented) has the advantage that return paths tend to form a shadow of he outgoing path on the ground plane, hence keeping impedances at a minimum,
I agree with your point.
  Reply With Quote
Old 28th August 2007, 03:56 AM   #33
banana is offline banana  Hong Kong
diyAudio Member
 
Join Date: Feb 2003
Location: Hong Kong
Quote:
Originally posted by panson_hk
a useful reference http://www.hottconsultants.com/pdf_f...ixedsignal.pdf
This is very true.

I've worked with an OEM project, which is a DAC board designed with the ground plane jointed at power supply only (like the Burr-Brown EVM approach). It radiates very badly around 700MHz, clearly the harmonics of I2S MCK. Later I solved the problem by adding wide junction across AGnd/DGnd plane, just underneath the I2S bus.
  Reply With Quote
Old 3rd September 2007, 04:00 PM   #34
h_a is offline h_a  Europe
diyAudio Member
 
h_a's Avatar
 
Join Date: Sep 2006
Location: Graz, Austria
@panson_hk: thanks a lot for the article! It's a pity that interesting information like this can only be found scarcely!

Anyway, it mainly argues against the isolation of ground planes and recommends physically separated layouting (and a common ground plane in general).

However there's no hint of the usefullness or potential disadvantages of using ground planes per se. Oh dear.


All the best, Hannes
  Reply With Quote
Old 3rd September 2007, 10:08 PM   #35
diyAudio Member
 
Join Date: Dec 2005
Location: At work
You must have some clearance...
Attached Images
File Type: png brd.png (41.0 KB, 191 views)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
JL Audio Mainboard Layout? XxGoKoUxX Car Audio 9 20th February 2008 03:33 AM
audio buffer layout digi01 Chip Amps 71 7th October 2006 05:34 AM
could John Audio re-desigh the Trace elliot TDA 1514A layout RIC Chip Amps 1 27th December 2003 04:39 PM
PCB layout of audio controller with PGA2310 louischia Pass Labs 20 24th April 2003 11:11 PM


New To Site? Need Help?

All times are GMT. The time now is 05:55 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2