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From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: Low leakage parts
References: <firstname.lastname@example.org> <3E17D633.378A@sneakemail.com> <3E184B38.588B@sneakemail.com> <email@example.com> <3E186B3C.5BA0@sneakemail.com> <firstname.lastname@example.org>
Date: Sun, 05 Jan 2003 13:58:38 -0500
NNTP-Posting-Date: Sun, 05 Jan 2003 13:58:06 EST
Organization: Bell Sympatico
Boris Mohar wrote:
> On Sun, 05 Jan 2003 12:28:28 -0500, Mike Monett
> >Boris Mohar wrote:
> >[... good info]
> >> Regards,
> >> Boris Mohar
> >> Viatrack Printed Circuit Designs
> >Thanks for the excellent info. If you find a sub for the 3N155A please
> >let us know.
> 3N163 from Siliconix. The specify the IGSS leakage of <-1pA at VGS of
> -40V. They were also used in same instrument that measured 1fA and up.
> I would still like to find something better.
> Boris Mohar
> Viatrack Printed Circuit Designs
Do you have to select devices to get low enough leakage?
Have you thought about the LMC662: 2fA typ, 1.3uV/C tempco? This would
raise the minimum current that can be measured, but the drift with
temperature is attractive for long-term meaurements.
How important is the low-fA region anyway? Are there many instances where
being able to measure it directly really matters?
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