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From: muyu@idunno.Princeton.EDU!phoenix.UUCP (Muyu Guo,,,)
Newsgroups: sci.physics,sci.electronics
Subject: Re: Circuits and UHV
Message-ID: <5997@idunno.Princeton.EDU>
Date: 6 Feb 91 05:46:10 GMT
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 In article <'-^&7$|@rpi.edu> atchan@aix01.aix.rpi.edu (Anthony C.T. Chan) writes:
 
>Does anyone have tips on building a UHV-compatible electronic circuits? 
 
>I am currently modifying a Scanning Tunneling Microscope for operation in the
>UHV and need to put the STM preamplifier in the UHV in order to minimize the
>noise.
 
>I understand that heat dissipation and outgassing from components could be
>a major problem. 
 
We have a STM with preamp sitting OUTSIDE of the chamber, preamp itself
being enclosed in a Aluminum box to minimize the noise. There is a feedthrough
to connect the preamp to the electrodes of the scanner. I don't know how much 
the noise can be further reduced to some level if the preamp is inside UHV
chamber.


--
Muyu Guo
Princeton University