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PCB layout guidelines for ultra low-noise analog front end
ricko_uk:
Hi,
I have experience in general low-noise PCB layout. But I am looking for EXTREME guidelines (documents, videos or any resources) for analog front end layout measuring microvolts (sometimes to nanovolts) signals.
I am not talking about just the basic well know guidelines (PCB decoupling, plane separation, GND via fences etc) or even the much less known/used one such as amplifier guard ring traces etc. I am talking about truly extreme PCB design guidelines.
Any suggestions and pointers to any resources (PDF, videos, web pages etc)?
Many thanks :)
thm_w:
I think low-noise and low level signals are two related but slightly different things.
You may want to look at the Keithley voltmeter designs for example:
https://xdevs.com/review/k182m/
https://www.eevblog.com/forum/testgear/nanovoltmeters-performance/
low noise amp:
https://www.eevblog.com/forum/metrology/need-lna-for-low-frequency-low-level-preamp/
http://www.hoffmann-hochfrequenz.de/downloads/lono.pdf
Guard ring traces, shields, board cutouts, teflon standoffs.
nctnico:
IMHO these kind of designs come down to designing ground paths (=power supply return paths). A guideline only goes so far.
moffy:
--- Quote from: nctnico on January 30, 2020, 09:44:28 pm ---IMHO these kind of designs come down to designing ground paths (=power supply return paths). A guideline only goes so far.
--- End quote ---
I agree, plus taking care to minimise voltages produced by temperature differences across components, due to thermocouple effects. Also keep the impedances low throughout.
Someone:
--- Quote from: ricko_uk on January 30, 2020, 08:39:54 pm ---I am looking for EXTREME guidelines (documents, videos or any resources) for analog front end layout measuring microvolts (sometimes to nanovolts) signals.
--- End quote ---
Whats the bandwidth of the measurement? That makes a world of difference to the approach. The basics come back to considering all the possible noise sources and their impact on the final result. Not sure there are any public guides on the matter as it is both domain specific, and commercially valuable information.
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