Re: Making thick-film resistors

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#2463

From: John Woodgate
Date: Mon, 14 Jan 2002 14:45

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I read in sci.electronics.design that Ian Macmillan
<iandmac@bigpond.com> wrote (in <lUz08.71937$HW3.70311@newsfeeds.bigpond
.com>) about 'Making thick-film resistors', on Mon, 14 Jan 2002:
>"John Woodgate" <jmw@jmwa.demon.co.uk> wrote in message
>news:XmMw$gBnJEQ8EwoZ@jmwa.demon.co.uk...
>> I read in sci.electronics.design that Ian Macmillan
>> <iandmac@bigpond.com> wrote (in <HJV%7.70441$HW3.65103@newsfeeds.bigpond
>> .com>) about 'Making thick-film resistors', on Sat, 12 Jan 2002:
>> >How does skin effect affect the value of carbon film resistors at
>gigahertz
>> >frequencies?
>>
>> It increases it. But I think you need to ask a different question.
>
>I'll bite??

'How does the impedance of a carbon-film resistor behave at GHz
frequencies, taking skin-effect into account?'

I suspect that shunt capacitance is quite as significant as skin effect.
If you take distributed capacitance to a ground-plane into account, the
resistor can appear to be either a low-pass or a notch filter, quite
apart from frequency effects on the resistive element alone. 
-- 
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk 
After swimming across the Hellespont, I felt like a Hero.

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From: John Woodgate <jmw@jmwa.demon.co.uk>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Making thick-film resistors
Date: Mon, 14 Jan 2002 14:45:12 +0000
Organization: JMWA Electronics Consultancy
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