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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.
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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.

Eric.
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