Re: Making thick-film resistors

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#2469

From: Russell Shaw
Date: Fri, 11 Jan 2002 02:33

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Jim Thompson wrote:
> 
> On Fri, 11 Jan 2002 01:47:14 GMT,
> "Spehro Pefhany" <speff@interlog.com>,
> In Newsgroup: sci.electronics.design,
> Article: <Cur%7.164767$pa1.49053968@news3.rdc1.on.home.com>,
> Entitled: "Re: Making thick-film resistors",
> Wrote the following:
> 
> |In sci.electronics.design Russell Shaw <rjshaw@iprimus.com.au> wrote:
> |
> |> I need to make small resistors (10-200ohms) operate at a
> |> few GHz, and so be non-inductive/capacitive. I can do it
> |> by depositing carbon paste with a stencil.
> |
> |You should be able to buy this stuff from the makers of inks for
> |thick-film hybrids. You can silk screen it on (control of viscosity,
> |pressure and squeegee angle and spacing from the substrate are all
> |important in controlling the thickness). Then it is "fired" at a high
> |temperature. You can trim said resistors with abrasive or lasers.
> |
> |Is it really such a big deal with regular resistors? I can't imagine an
> |0402 or 0201 resistor 10-200R resistor having much inductance or
> |capacitance at those frequencies.
> |
> |Best regards,
> |Spehro Pefhany
> 
> And good fun, "firing" will melt/toast PCB's, so you have to have a
> ceramic (alumina typically) substrate.

Wonder what they use for the binder in membrane switch pads?

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