Re: [SI-LIST] : Transmission line inductance
Fred Balistreri (email@example.com)
Thu, 25 Mar 1999 10:39:06 -0800
Josip Popovic wrote:
> I would like to now if anyone of you had to create a PCB trace with a
> precise inductance value?
> In the spec for LT1533 (Linear Technology switching regulator) is shown
> the device should have 25nH inductance between the ground pin and the
> GND. According to my calculations a microstrip line with W=7 (H=5, T=2.8
> Er=4.3) has app. 6.5nH/inch. So to get a 25nH trace one would need to
> have a
> 3.8inch long trace.
> Q1: Is there a trace configuration that I could use to create a 25nH
> inductance that would not be so lengthy and in the same time would not
> as an antenna?
> Q2: Is my calculation (app 6.5nH/inch) correct?
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Based on your numbers I get 7.88nh/inch.
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