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Old 21st October 2003, 08:00 PM   #1
svokke is offline svokke  Belgium
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Default Ground planes instead of star ground

I almost finihed the PCB for my OPA549T amp. Just need to route the grounds. Is there any reason why most prefer a starground layout instead making one big ground plane? It's a lot less drawing with the etching pen...
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Old 21st October 2003, 10:12 PM   #2
SY is offline SY  United States
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Star gounds are MUCH less susceptible to ground loops, noise pickup, and oscillation. You might think and hope that your ground plane is unipotential, but it normally won't be.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 22nd October 2003, 12:59 AM   #3
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if you are doing it via PCB, consider running the ground "leads" on the topside to a central point, then place the ground plane on the bottom side -- connect all through one via near the power ground.
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Old 22nd October 2003, 01:01 AM   #4
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There is a good reference on the Analog Devices (App Note AN-345) site about earths, and currents in ground planes - required reading.

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