Re: Making thick-film resistors

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#2459

From: Tony Williams
Date: Tue, 15 Jan 2002 10:38

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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.

 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.

-- 
Tony Williams.

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From: Tony Williams <tonyw@ledelec.demon.co.uk>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Making thick-film resistors
Date: Tue, 15 Jan 2002 10:38:56 +0000 (GMT)
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