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deep nwell isolation effectiveness (Read 3015 times)

RobG Community Fellow Offline Posts: 570 Bozeman, MT	deep nwell isolation effectiveness Aug 8^th, 2013, 6:21pm Hi All, I have a vague memory of someone (loose-electron?) saying they did some studies on deep Nwell isolation and found that the noise isolation improvements were minimal. Was the issue that you could not contact it at a low enough impedance? Any (decent) papers on the subject? rg
Back to top	« Last Edit: Aug 08^th, 2013, 7:29pm by RobG » IP Logged

loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: deep nwell isolation effectiveness Reply #1 - Aug 18^th, 2013, 11:56am yes - we did some real world studies and the deep well does not help that much in most cases (2-4dB) (IBM, SiGe processes with deep-n-well 6HP IIRC) At high frequencies, coupling is going to be by parasitic paths and the deep wells do not make parasitics go away by magic.
Back to top	Jerry Twomey www.effectiveelectrons.com Read My Electronic Design Column Here Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical IP Logged

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