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Article #2460Re: Making thick-film resistors
From: Russell Shaw
Date: Tue, 15 Jan 2002 10:59
Date: Tue, 15 Jan 2002 10:59
38 lines
2962 bytes
2962 bytes
Tony Williams wrote: > > In article <r8LfJZB47uQ8EwOR@jmwa.demon.co.uk>, > John Woodgate <jmw@jmwa.demon.co.uk> wrote: > > > 'How does the impedance of a carbon-film resistor behave at GHz > > frequencies, taking skin-effect into account?' > > AFAIR skin-depth also depends on the resistivity > of the conducting material...being larger for a > conducting material of high resistivity. So it > could be possible to make film resistors where > the film thickness is smaller than the skin-depth > (at the highest frequency of interest). In which > case there would be little or no skin-effect. That's how i was going to choose the resistivity and thickness. > It would also seem sensible for the conducting > material (resistive in this case) to be non- > -magnetic. > > Which is possibly why the radar lab next door > seemed to prefer resistors made up of a continuous > layer (not spiral ground) of carbon deposited onto > hollow ceramic tubes. > > > I suspect that shunt capacitance is quite as > > significant as skin effect. > > More so I would suspect. I can choose the optimum physical dimensions to minimize both capacitive and inductive parasitic effects.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,d2a3518e413f7b58 X-Google-Attributes: gid112d1e,public X-Google-Thread: 103407,d2a3518e413f7b58 X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2002-01-15 02:58:23 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!bloom-beacon.mit.edu!news-out.cwix.com!newsfeed.cwix.com!feed2.news.rcn.net!rcn!news-out.visi.com!hermes.visi.com!news1.optus.net.au!optus!news0.optus.net.au!news.iprimus.com.au Message-ID: <3C440B7A.22F5C476@iprimus.com.au> From: Russell Shaw <rjshaw@iprimus.com.au> X-Mailer: Mozilla 4.75 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: sci.electronics.design,aus.electronics Subject: Re: Making thick-film resistors References: <3C3E2DF7.27B47935@iprimus.com.au> <3c3ea447@dnews.tpgi.com.au> <ACy%7.66954$HW3.61794@newsfeeds.bigpond.com> <HdPEBwAWNvP8Ewhx@jmwa.demon.co.uk> <k7G%7.19972$X87.2693805@news2-win.server.ntlworld.com> <HJV%7.70441$HW3.65103@newsfeeds.bigpond.com> <XmMw$gBnJEQ8EwoZ@jmwa.demon.co.uk> <lUz08.71937$HW3.70311@newsfeeds.bigpond.com> <r8LfJZB47uQ8EwOR@jmwa.demon.co.uk> <4af92c0c90tonyw@ledelec.demon.co.uk> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Original-NNTP-Posting-Host: 203.134.138.250 Lines: 38 X-Original-NNTP-Posting-Host: 127.0.0.1 Date: Tue, 15 Jan 2002 21:59:06 +1100 NNTP-Posting-Host: 203.134.67.67 X-Complaints-To: abuse@iprimus.com.au X-Trace: news0.optus.net.au 1011092301 203.134.67.67 (Tue, 15 Jan 2002 21:58:21 EST) NNTP-Posting-Date: Tue, 15 Jan 2002 21:58:21 EST Organization: iPrimus Customer - reports relating to abuse should be sent to abuse@iprimus.com.au