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Opamp layout rules
Opamp layout rules
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Old 27th March 2006, 10:39 AM   #11
Onvinyl is offline Onvinyl
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Quote:
Originally posted by peranders

Now I have "crosses" on both sides. The first batch had this error.
P-A, I don't get it. From what I see, C6/C13 go nowhere. How are they connected now?
Rüdiger
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Old 27th March 2006, 10:44 AM   #12
peranders is offline peranders  Sweden
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Opamp layout rules
Rüdiger, this you'll have to study more. Check Walt Jung's Opamp book but seriously, this applies to signal sources with very high internal impedances', like pH-probes, photo detectors. The this is to eliminate voltage between two traces and by that leakage currents. 478 GOhms a couple of volts plus some dirt => current.
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Old 27th March 2006, 10:46 AM   #13
peranders is offline peranders  Sweden
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Quote:
Originally posted by Onvinyl

P-A, I don't get it. From what I see, C6/C13 go nowhere. How are they connected now?
Rüdiger
The picture shows a groundplane on the "solderside" plus an another one on the "component side" which didn't get connected 100% right but now it's fixed.
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Old 27th March 2006, 10:49 AM   #14
peranders is offline peranders  Sweden
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Opamp layout rules
http://www.analog.com/library/analog..._Ch4_final.pdf
Page 4.44 Guard rings
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Old 27th March 2006, 10:55 AM   #15
Onvinyl is offline Onvinyl
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Quote:
Originally posted by peranders

The picture shows a groundplane on the "solderside" plus an another one on the "component side" which didn't get connected 100% right but now it's fixed.
Yes, it's clear you have two groundplanes. What I don't see is, where do C6/C13 go, as it on the photo it *looks* like the pads are not connected to either groundplane.
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Old 27th March 2006, 11:04 AM   #16
peranders is offline peranders  Sweden
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They have two crosses now one on each side.
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