[SI-LIST] Re: Guard Rings ... DC
- From: steve weir <weirsi@xxxxxxxxxx>
- To: keithK EPD <epd2001usa@xxxxxxxxxxx>
- Date: Fri, 19 Nov 2010 05:35:07 -0800
Keith there are articles on this sort of stuff from the makers of very
input impedance amps: ADI, TI, NS, LTI, etc. The trade-off with
conformal coating is that the coating will give you a lot more leakage
than a clean, dry PCB. If the board can be kept clean and dry then
avoid the conformal coat. There are other tricks that have been
previously mentioned involving packaging the Hi Z amplifier off the PCB
using PTFE stand-offs and such.
Steve
keithK EPD wrote:
> I am dealing with DC ! so, some of my questions are not for the entire
> High speed audience, so I apologize
>
> I have a 4 gig ohm electrode/electrodes(s) ..... my electrode spacing is
> 0.230" and my socket has a 0.175" diameter / 4 layer
>
> I haven't seen much lit on the subject -
>
> PCB material / voids / components / etch width to the 1 resistor into the
> opAmp / given 0.060" / slots req'd
> what does conformal coating do for me....
>
> comments, pointers to white papers, etc are welcome.
>
>
> Keith Kowal
>
> www.product-designs.com
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
>
--
Steve Weir
IPBLOX, LLC
150 N. Center St. #211
Reno, NV 89501
www.ipblox.com
(775) 299-4236 Business
(866) 675-4630 Toll-free
(707) 780-1951 Fax
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
